Complete Cutter Rig Visual Diagram + All 8 Collapsible Categories (#1 Headstay through #8 Mast, Spreaders & Structural Hardware)
| # | Stay (qty) | Wire | Top connector | Bottom connector | Other parts |
|---|---|---|---|---|---|
| 1 | Headstay (1) | 9/32" 1x19, ~45' 6" | Swaged eye Hayn 12SME932 + 12FTJ toggle | Mechanical stud Sta-Lok SL-036-932 or Hi-Mod 12CS932 | Harken Unit 1 furler, 8" link plate, 1/2" pins |
| 2 | Staysail stay (1) | 9/32" 1x19, ~34' 2" | Swaged eye 12SME932 + 12FTJ toggle | Mechanical stud SL-036-932 or 12CS932 | Harken Unit 0 furler, deck tang, tie-rod |
| 3 | Upper shrouds (2) | 5/16" 1x19, ~45' 1" | Swaged T-ball Hayn 10TB516 | Mechanical stud SL-036-516 or 12CS516 + 12ETJ turnbuckle | Spreader boots, 1/2" pins, turnbuckle boots |
| 4 | Fwd lower shrouds (2) | 9/32" 1x19, ~23' 8" | Swaged T-ball Hayn 8TB932 | Mechanical stud SL-036-932 or 12CS932 + 12ETJ turnbuckle | 1/2" pins, shroud rollers |
| 5 | Aft lower shrouds (2) | 9/32" 1x19, ~23' 10" | Swaged T-ball 8TB932 | Mechanical stud SL-036-932 or 12CS932 + 12ETJ turnbuckle | 1/2" pins, turnbuckle boots |
| 6 | Twin backstays (2) | 1/4" 1x19, ~46' 8" | Swaged jaw Hayn 7SMJ14 | Mechanical stud 7CS14 or SL-036-14 + 7ETJ turnbuckle | 7/16" pins, turnbuckle boots |
| 7 | Bobstay (1) | 5/8" solid rod, ~4' 4" | Threaded clevis jaw | Threaded clevis jaw | Jam nuts, 1/2" pins |
Original factory fabricator of all IP-320 standing rigging wires, solid-rod bobstay, 8" link plate, chainplates & bowsprit tangs (Largo, FL — has Hull #40 file on record).
North American distributor for Sparcraft I-365E ↗ / Isomat NG-46 furling masts, NG1 ↗ masthead assemblies, 90 mm sheaves, airfoil spreaders & T-ball backing plates.
US-made 316L SS toggles (12FTJ ↗, 7FTJ ↗), swage eyes/studs, T-balls (10TB516 ↗, 8TB932 ↗), chrome-bronze turnbuckles (12ETJ ↗, 7ETJ ↗), Hi-Mod studs & clevis pins.
Reusable mechanical lower studs for DIY/offshore lower terminations in 9/32" (036-07), 5/16" (036-08), and 1/4" (136-06) 1×19 wire.
Headstay Unit 1 (7301.10 ↗ / 7411.10) & Staysail Unit 0 (7300.10 ↗ / 7410.10) furlers, 1/2" long link plates, foil connector bushings & halyard restrainers.
| Item # | Part Name & Location | Part Number & Verified Vendor Buy Links | Wire Size, Length & Pin Specs | Connection & Description | Recommended Type of Part & Notes |
|---|---|---|---|---|---|
| 1.1 |
Top Connector (Masthead-to-Headstay Connector) Forward Masthead Tang → Upper Jaw Toggle → Swaged Marine Eye (Qty 1 set) |
Masthead Adapter: Rig-Rite NG1-SBE-8 ↗Upper Toggle: Hayn 12FTJ ↗ (or Schaefer 74-29)Upper Terminal: Hayn 12SME932 ↗ Swaged Eye
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Wire Size: 9/32" (7.1 mm)Upper Pin: 1/2" (12.7 mm)Toggle Pin: 1/2" (12.7 mm)Toggle Length: ~2-1/2" (64 mm) pin-to-pin
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Connects the Sparcraft I-365E ↗ / NG1 ↗ masthead forestay tang (1/2" pin) to the top of the headstay wire (1.3). Per factory Fig. 25 Note 2: "Toggle on top of headstay to facilitate removal of roller furling headsail." Provides full two-plane articulation above the Harken upper halyard swivel.
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Forged 316 SS Jaw Toggle (Hayn 12FTJ) + Factory Rotary-Swaged Marine Eye (Hayn 12SME932).Never omit the upper toggle above a roller-furling headstay; without it, off-axis genoa loads bend and fatigue the upper swage shank. |
| 1.2 |
Bottom Connector (Headstay-to-Bowsprit Lower Turnbuckle & Terminal) Inside Harken Drum above 8" Link Plate (Qty 1 set) |
Mech. Lower Stud (Upgrade): Sta-Lok SL-036-932 ↗ or Hayn Hi-Mod 12CS932 ↗OEM Swage Stud: Harken 818 / Hayn 12SS932 ↗Turnbuckle Body: Harken MkIII Unit 1 Integral Turnbuckle ( 7301.10 ↗)
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Wire Size: 9/32" (7.1 mm)Thread: 1/2"-20 UNF RHLower Clevis Pin: 1/2" (12.7 mm)Setting: Set at 2/3 Open for baseline measurement
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Terminates the bottom end of the 9/32" headstay wire (1.3) inside the Harken MkIII Unit 1 torque tube and connects via a 1/2" clevis pin to the top hole of the 8" link plate (1.5). Allows headstay tension and mast rake adjustment.
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Reusable Mechanical Lower Terminal (Sta-Lok SL-036-932 or Hayn Hi-Mod 12CS932) + Chromed Bronze Turnbuckle.Using a removable mechanical stud at the bottom lets you slide the 9/32" wire through the Harken foil extrusions on deck and eliminates hidden lower-swage crevice corrosion.
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| 1.3 |
Headstay Wire (Outer Forestay Wire) Masthead to Bowsprit Tip inside Furler Foil (Qty 1) |
OEM Package: Seco South IP320-40-HS ↗Wire Spec: 316SS-1X19-932 ↗ (Type 316L Stainless)
Verified Vendor Buy / Order Links:
Order OEM IP-320 Headstay (Seco South) ↗
Request Hull #40 Quote (Seco South) ↗
Hayn 9/32" 1×19 316L SS Wire Spec ↗
Buy 7mm/9/32" 1×19 SS Wire (Vela) ↗
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Diameter: 9/32" (7.14 mm)Pin-to-Pin Length: ~45' 6" (13.87 m) (Top eye to TB pin @ 2/3 open)Geometric Span: 46' 4-1/2" (14.14 m)
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Primary outer forestay supporting the mast forward and carrying the roller-furling genoa. Per Fig. 25 Note 1: "Headstay measured from the swaged marine eye at the top to the turnbuckle clevis pin at 2/3 open." Runs full length inside the Harken MkIII aluminum foil extrusions (1.4).
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Marine-Grade Type 316L 1×19 Stainless Steel Wire (9/32", Breaking Strength ~10,300 lbs).Order from Seco South Inc. with upper eye factory-swaged and lower end left bare (+6" extra length) for field-fitting the Sta-Lok / Hi-Mod stud.
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| 1.4 |
Headstay Roller Furler Assembly (Drum, Airfoil Foils & Halyard Swivel) Full Length of Headstay (Qty 1 system) |
Installed OEM: Harken MkIII Unit 1 ↗ (P/N 7301.10 ↗ / 7301.14 w/ 1/2" pin)Current Equivalent: Harken MkIV Unit 1 ↗ (P/N 7411.10 ↗)
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Unit Size: Harken Unit 1Foil Extrusions: 7× 6' 0" sections + bottom feeder (~44' total foil length)Luff Tape Groove: #6 (6 mm)
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Single-line headsail roller furling system comprising the lower drum and line guard, lower torque tube, sectional twin-groove aluminum airfoil extrusions, interlocking foil connectors, and upper Torlon ball-bearing halyard swivel. |
Retain & Service Existing Harken MkIII Unit 1 ↗.Flush upper swivel and lower drum Torlon bearings with fresh water and dry PTFE ( McLube Sailkote ↗).
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| 1.5 |
Lower 8" Link Plate (Headstay Drum Riser / Toggle Extension) Between Headstay Turnbuckle (1.2) and Bowsprit Tip Tang (Qty 1 set) |
OEM: Seco South IP320-LP8-12 ↗Replacement: Hayn Custom 12LP-8 (or Harken 7411.22 ↗ Long Link Kit)
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Length: 8.0" (203 mm) pin-center to pin-centerPin Holes: 1/2" (12.7 mm) top & bottomStock: 1/4" × 1-1/2" 316L SS
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Required by factory Fig. 25 Note 3: "An 8" link plate is used below the headstay turnbuckle." Elevates the Harken MkIII furling drum 8" above the bowsprit tip tang so the drum clears the twin anchor rollers and stowed anchors.
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Electropolished Type 316L Stainless Steel 8" Link Plate Pair. Inspect both 1/2" pin holes for elongation or stress cracks during every rig inspection.
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| 1.6 |
Internal Foil-to-Wire Isolator Bushings (Liner Clips) Inside Every Harken Unit 1 Foil Connector Joint (Qty 7–8) |
Harken: HFG-315 ↗ (Unit 1 Plastic Isolator for 9/32" / 7 mm wire)Connector Kit: Harken 7301.31 ↗
Verified Vendor Buy / Order Links:
Buy Harken Unit 1 Foil Connector & Bushing Set (Vela) ↗
Buy Harken Unit 1 Ocean Connector Set (Vela) ↗
Harken Unit 1 Parts & Bushing Diagram PDF ↗
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Inner Bore: 9/32" (7.1 mm) wireQuantity: 7–8× bushings (one per 6' foil joint)
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Molded polymer bushings that snap around the 9/32" stainless wire at each foil joint inside the aluminum extrusion. Centers the foil on the wire and prevents aluminum-to-stainless fretting.
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Mandatory 100% Replacement During Re-Rigging (Harken HFG-315).
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| 1.7 |
Headstay Clevis Pins, Split Cotter Pins & Masthead Halyard Restrainer Masthead Tang, Mast Face & Bowsprit Tip (Complete Hardware Kit) |
Clevis Pins: Hayn CP12 ↗ (1/2" 316 SS, Qty 3–4)Cotter Pins: Suncor S0125-0031 ↗ (1/8" × 1" 316 SS)Halyard Restrainer: Harken 947 ↗
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Clevis Pins: 1/2" (12.7 mm) ODCotter Pins: 1/8" × 1" 316 SSRestrainer: Upper mast face below sheave box |
Secures all pin joints in the Headstay load path (masthead tang → upper toggle → swage eye, and lower turnbuckle → 8" link plate → bowsprit tip tang). The Harken 947 ↗ halyard restrainer maintains a 10°–15° halyard lead angle to prevent halyard wrap.
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Brand-New Type 316 SS Clevis Pins + Single-Use 316 SS Split Cotter Pins + Harken 947 ↗ Halyard Deflector.
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| Item # | Part Name & Location | Part Number & Verified Vendor Buy Links | Wire Size, Length & Pin Specs | Connection & Description | Recommended Type of Part & Notes |
|---|---|---|---|---|---|
| 2.1 |
Top Connector (Mast Hounds-to-Staysail Stay Connector) Staysail Mast Tang (~33' 9") → Upper Jaw Toggle → Swaged Marine Eye (Qty 1 set) |
Mast Hounds Tang: Rig-Rite / Sparcraft I-365E ↗ Staysail TangUpper Jaw Toggle: Hayn 12FTJ ↗ (1/2" pin) or 7FTJ ↗Upper Terminal: Hayn 12SME932 ↗ Swaged Eye
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Wire Size: 9/32" (7.1 mm)Upper Pin: 1/2" (12.7 mm)Toggle Offset: ~2-1/2" (64 mm) pin-to-pin
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Connects the through-bolted stainless staysail hounds tang on the forward face of the Sparcraft mast (at ~33' 9" above deck) to the top of the staysail stay wire (2.3). Per Fig. 25 Note 2, includes an upper jaw toggle to articulate freely above the staysail roller furler.
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Forged 316 SS Jaw Toggle (Hayn 12FTJ) + Factory Rotary-Swaged Marine Eye (Hayn 12SME932).Protects the upper swage terminal against bending fatigue when the self-tacking Hoyt staysail boom sheets across from tack to tack. |
| 2.2 |
Bottom Connector (Staysail Lower Stud & Furler Turnbuckle) Inside Harken Unit 0 Drum at Foredeck Tang (Qty 1 set) |
Mech. Lower Stud (Upgrade): Sta-Lok SL-036-932 ↗ or Hayn Hi-Mod 12CS932 ↗OEM Swage Stud: Hayn 12SS932 ↗ / 7SS932 ↗Turnbuckle Body: Harken MkIII Unit 0 Integral Turnbuckle ( 7300.10 ↗)
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Wire Size: 9/32" (7.1 mm)Lower Pin: 7/16" (11.1 mm) or 1/2" (12.7 mm) clevis pinSetting: Set at 2/3 Open for baseline measurement
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Terminates the bottom end of the 9/32" staysail stay wire (2.3) inside the Harken MkIII Unit 0 lower furling drum and pins directly to the foredeck staysail stemhead tang (2.5) just forward of the Hoyt boom pedestal.
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Reusable Mechanical Lower Terminal (Sta-Lok SL-036-932 or Hayn Hi-Mod) + Integral Turnbuckle.Allows feeding the bare wire through the Harken Unit 0 foils on deck and assembling the lower terminal without a swaging machine. |
| 2.3 |
Staysail Stay Wire (Inner Cutter Forestay Cable) Staysail Hounds (~33' 9") to Foredeck Stemhead Tang (Qty 1) |
OEM Package: Seco South IP320-40-SS ↗ (Hull #40 & Up Heavy Spec)Wire Spec: 316SS-1X19-932 ↗ (Type 316L Stainless)
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Diameter: 9/32" (7.14 mm) (Hull #40 & up; earlier hulls #1–39 used 7/32")Pin-to-Pin Length: ~34' 2" (10.41 m) (@ 2/3 open)Geometric Span: ~35' 0" (10.67 m)
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Inner cutter forestay supporting the upper-middle mast section against forward/aft pumping (opposed by the #5 Aft Lower Shrouds) and carrying the roller-furling self-tacking staysail on the Hoyt boom.
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Marine-Grade Type 316L 1×19 Stainless Steel Wire (9/32", Breaking Strength ~10,300 lbs).Verify whether the installed Harken Unit 0 foil connectors on Hull #40 accommodate the heavy-spec 9/32" wire or step-down stud before cutting.
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| 2.4 |
Staysail Roller Furler Assembly (Drum, Airfoil Foils & Halyard Swivel) Full Length of Staysail Stay (Qty 1 system) |
Installed OEM: Harken MkIII Unit 0 ↗ (P/N 7300.10 ↗)Current Equivalent: Harken MkIV Unit 0 ↗ (P/N 7410.10 ↗)
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Unit Size: Harken Unit 0Foil Extrusions: 5× 6' 0" aluminum airfoil sections (~32' total foil length)Luff Tape Groove: #6 (6 mm)
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Single-line staysail roller furling system including the lower drum mounted just forward of the Hoyt staysail boom gooseneck, lower torque tube, 5× interlocking aluminum airfoil extrusions, and upper Torlon ball-bearing halyard swivel.
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Retain & Service Existing Harken MkIII Unit 0 ↗.Rinse drum and upper swivel bearings with fresh water and lubricate with McLube Sailkote ↗.
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| 2.5 |
Foredeck Staysail Stemhead Tang & Internal Chain-Locker Tie-Rod Foredeck Aft of Anchor Locker to Bulkhead Knee (Fig. 17 & Fig. 22, Qty 1 set) |
Deck Tang: Seco South IP320-SS-TANG ↗ (316L SS Thru-Deck Plate)Internal Tie-Rod: Seco South IP320-SS-ROD ↗ (1/2" 316 SS Rod & Clevis Ends)
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Tie-Rod Dia: 1/2" (12.7 mm) solid 316 SS rodTie-Rod Length: ~3' 8" (1.12 m) below foredeckDeck Location: JSP ~9' 3" forward of mast
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Per Fig. 17 and Fig. 22, the staysail stay does not merely bolt to the balsa-cored foredeck skin; its deck tang connects to an internal 1/2" stainless steel tie-rod running downward through the anchor/chain locker to a heavy stainless tang bolted into the structural forward bulkhead/stem knee.
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Inspect Internal Anchor-Locker Tie-Rod & Re-Bed Foredeck Tang Plate. Open the forward chain locker access door periodically to inspect the internal tie-rod clevis pins and jam nuts for corrosion. |
| 2.6 |
Staysail Internal Foil-to-Wire Isolator Bushings Inside Every Harken Unit 0 Foil Connector Joint (Qty 5–6) |
Harken: HFG-299 ↗ / HFG-315 ↗ (Plastic Isolator Bushings)Connector Kit: Harken 7300.31 ↗
Verified Vendor Buy / Order Links:
Buy Harken Unit 0 Foil Connector & Bushing Set (Vela) ↗
Buy Harken Unit 0 Ocean Connector Set (Vela) ↗
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Quantity: 5–6× bushings (one per 6' foil joint)
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Molded polymer liner bushings inside each Harken Unit 0 foil connector joint that isolate the aluminum airfoil extrusions from the stainless staysail wire (2.3).
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Replace All Bushings Whenever Staysail Wire Is Replaced. |
| 2.7 |
Staysail Clevis Pins, Split Cotter Pins & Halyard Restrainer Staysail Hounds, Upper Mast Face & Foredeck Tang (Complete Kit) |
Clevis Pins: Hayn CP12 ↗ (1/2") / CP716 ↗ (7/16") 316 SSCotter Pins: Suncor S0125-0031 ↗ (1/8" × 1" 316 SS)Halyard Restrainer: Harken 947 ↗
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Clevis Pins: 1/2" upper & 7/16" / 1/2" lowerCotter Pins: 1/8" × 1" 316 SS
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Secures the upper staysail hounds tang, upper jaw toggle, and lower foredeck tang connection. The Harken 947 ↗ halyard restrainer mounts on the mast face just below the staysail halyard exit to prevent staysail halyard wrap.
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Brand-New 316 SS Clevis Pins + Single-Use 316 SS Split Cotter Pins. |
Fig. 25 — Hull #40 & Up Heavy Spec):
Island Packet upgraded the Staysail Stay wire from 7/32" (Hulls #1–39) to 9/32" on Hull #40 (nauti NAIDOO) & up. Pin-to-pin length (~34' 2") is measured from the upper swaged marine eye (2.1) to the lower turnbuckle clevis pin (2.2) at 2/3 open.
| Item # | Part Name & Location | Part Number & Verified Vendor Buy Links | Wire Size, Length & Pin Specs | Connection & Description | Recommended Type of Part & Notes |
|---|---|---|---|---|---|
| 3.1 |
Top Connector (Masthead-to-Upper Shroud Terminal) Port & Starboard Masthead Upper Shroud Slots (Qty 2 sets) |
T-Ball Terminal: Hayn 10TB516 ↗ / Rig-Rite Sparcraft 5/8" T-Ball for 5/16" wireBacking Plate: Sparcraft I-365E ↗ Stainless Slotted T-Ball PlateAlt. Tang Option: Upper Tang + Hayn 12SMJ516 ↗ Swaged Jaw (1/2" pin)
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Wire Size: 5/16" (7.94 mm)T-Ball / Pin Size: 5/8" T-Ball shank (or 1/2" tang pin)Quantity: 2× (1 Port, 1 Starboard)
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Connects the top of the port and starboard upper shrouds (3.3) into the upper side walls of the Sparcraft I-365E ↗ masthead just below the masthead cap (8.1). Transfers primary transverse (athwartships) mast compression and sailing heel loads into the cap shrouds.
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Factory Rotary-Swaged Type 316L SS T-Ball Terminal (Hayn 10TB516) + Inspect Slotted Stainless Mast Wall Backing Plate.Always inspect the curved bearing seat of the stainless T-ball backing plate on the mast wall for hairline cracks or wallowing when the mast is unstepped. |
| 3.2 |
Bottom Connector (Upper Shroud Lower Terminal Stud & Toggle Turnbuckle) At Port & Starboard Cap Shroud Chainplates (Qty 2 sets) |
Open-Body Toggle Turnbuckle: Hayn 12ETJ ↗ (1/2"-20 UNF Chrome-Bronze Body w/ Forged 316 SS Lower Toggle Jaw)OEM Swage Stud: Hayn 12SS516 ↗ (1/2" thread for 5/16" wire)Mech. Stud Upgrade: Sta-Lok SL-036-516 ↗ or Hayn Hi-Mod 12CS516 ↗
Verified Vendor Buy / Order Links:
Buy Hayn 1/2" Open-Body Toggle Turnbuckle (Vela) ↗
Buy Hayn 1/2"-20 Open Turnbuckle Body (Vela) ↗
Hayn 12ETJ Open-Body Toggle Turnbuckle Spec ↗
Buy Sta-Lok 5/16"×1/2" Stud 036-08 (Vela) ↗
Buy Hayn Hi-Mod 5/16"×1/2" Stud 12CS516 (Vela) ↗
Buy Hayn Swage Rigging Studs (Fisheries) ↗
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Wire Size: 5/16" (7.94 mm)Thread: 1/2"-20 UNFChainplate Clevis Pin: 1/2" (12.7 mm)Setting: Set at 2/3 Open for baseline measurement
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Terminates the bottom end of each 5/16" upper shroud wire (3.3) and pins to the center/upper hole of the hull-side cap shroud chainplate (3.5) via an integral forged lower toggle jaw (1/2" clevis pin). Provides primary athwartships mast plumbing and cap-shroud tensioning (typically 12%–15% of wire breaking strength).
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Open-Body Chrome-over-Bronze Toggle Turnbuckle (Hayn 12ETJ or C.S. Johnson 26-508) + Swaged or Reusable Mechanical Stud.Forged bronze turnbuckle barrels with stainless studs eliminate stainless-to-stainless thread galling under heavy cap-shroud loads. |
| 3.3 |
Upper Shroud Wire (Cap Shroud Cable, Port & Starboard) Masthead over Spreader Tip to Outboard Hull Chainplate (Qty 2) |
OEM Package: Seco South IP320-40-US ↗ (Hull #40 & Up Heavy Spec)Wire Spec: 316SS-1X19-516 ↗ (Type 316L Stainless)
Verified Vendor Buy / Order Links:
Order OEM IP-320 5/16" Upper Shrouds (Seco South) ↗
Request Hull #40 Cap Shroud Pair Quote (Seco South) ↗
Hayn 5/16" 1×19 316L SS Wire Spec ↗
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Diameter: 5/16" (7.94 mm) (Hull #40 & up; earlier hulls #1–39 used 9/32")Pin-to-Pin Length: ~45' 1" (13.74 m) each (@ 2/3 open)Breaking Strength: ~12,500 lbs (5,670 kg) each
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Primary lateral standing rigging wires supporting the top of the Sparcraft I-365E ↗ mast athwartships. Runs from the masthead (3.1), over the outer grooved tip of the 3' 9" single airfoil spreader (3.4), down to the outboard hull sheer chainplate (3.5).
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Marine-Grade Type 316L 1×19 Stainless Steel Wire (5/16").Per factory Fig. 25, Hull #40 (nauti NAIDOO) uses the heavy-spec 5/16" upper shrouds (largest wire diameter on the boat). Always replace port and starboard cap shrouds as a matched pair.
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| 3.4 |
Spreader Tip Wire Clamp & Protective Spreader Boots At Outer Tip of Port & Starboard Airfoil Spreaders (~24' 6" above deck, Qty 2 sets) |
Spreader Tip Clamp: Rig-Rite / Sparcraft Airfoil Spreader Tip Plate & Set Screws Spreader Boots: Taylor Made / Rig-Rite Molded UV Rubber or Leather Spreader Boots (Large)
Verified Vendor Buy / Order Links:
Rig-Rite Isomat / Sparcraft Spreader Tips & Clamps ↗
Buy Molded Spreader Boots (Vela) ↗
Rig-Rite I-365E / NG-46 Spreader Hardware ↗
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Spreader Length: ~3' 9" (45.0" / 1.14 m) eachWire Groove: Sized for 5/16" (7.94 mm) cap shroud wire
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Clamps the continuous 5/16" upper shroud wire (3.3) into the outer tip of the port and starboard aluminum airfoil spreaders so the spreaders bisect the cap-shroud angle (~6° upward angle) and cannot slip vertically along the wire. Protective rubber or leather boots cover the metal tip clamps.
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Seize Wire + Install UV-Stabilized Rubber or Hand-Stitched Leather Spreader Boots. Unbooted spreader tips rapidly chafe and tear the leech of the 130% roller-furling genoa when sheeted in tight.
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| 3.5 |
Upper Shroud Chainplate (Center Hull-Side Cap Shroud Chainplate) Port & Starboard Outboard Hull Sheer / Bulwark (Fig. 22, Qty 2) |
OEM Chainplate: Seco South / Island Packet IP320-CP-US ↗Material: Electropolished Type 316L Stainless Steel Flat Bar
Verified Vendor Buy / Order Links:
Order OEM IP-320 Cap Shroud Chainplate (Seco South) ↗
Mack Sails Heavy 316L Island Packet Chainplates ↗
Island Packet Factory Parts (IPY Parts) ↗
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Bar Stock: 1/4" × 2" × ~24" (6.35 × 50.8 mm) 316L SSPin Hole: 1/2" (12.7 mm) clevis pinMounting: Externally through-bolted at hull sheer |
Heavy stainless chainplate mounted externally on the port and starboard hull sheer/bulwark (eliminating deck-penetration leaks through the balsa-cored side decks) and through-bolted with stainless backing plates into heavy hand-laid fiberglass knees bonded to the hull and interior cabinetry (Fig. 22).
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Inspect Chainplate Pin Holes & Sheer Thru-Bolts (No Routine Replacement Needed on External Chainplates). Because IP-320 shroud chainplates are mounted externally on the hull sheer rather than passing through a wet deck core, they are fully visible for dye-penetrant inspection. |
| 3.6 |
Upper Shroud Turnbuckle Boots & Shroud Rollers Over Lower Turnbuckles & Lower 6' of Wire (Port & Starboard, Qty 2 sets) |
Turnbuckle Boots: Davis Instruments #1452 ↗ (for 1/2" turnbuckles) or Cal June / Leather BootsShroud Rollers: Schaefer / Davis Snap-On Roller Guards for 5/16" wire
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Boot Length: ~16"–18" full turnbuckle coverageWire Bore: 5/16" (8 mm) top cap
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Slides over the open-body bronze turnbuckles (3.2) and lower clevis/cotter pins at the side decks so genoa sheets, staysail sheets, and crew ankles cannot snag on cotter pins.
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Ventilated White PVC or Leather Turnbuckle Boots (Open Bottom for Drainage). Never seal the bottom of a turnbuckle boot with tape; air must circulate so rainwater drains freely. |
| 3.7 |
Upper Shroud Clevis Pins & Split Cotter Pins Chainplate Toggle Jaws & Turnbuckle Threads (Port & Starboard, Complete Kit) |
Clevis Pins: Hayn CP12 ↗ (1/2" Type 316 SS, Qty 2–4)Cotter Pins: Suncor S0125-0031 ↗ (1/8" × 1" 316 SS Split Cotter Pins, Qty 6–8)
Verified Vendor Buy / Order Links:
Buy Hayn 1/2"×1" Clevis Pin 12CP (Vela) ↗
Hayn Clevis Pins Spec ↗
Buy 1/8"×1" 316 SS Cotter Pins (Vela) ↗
Hayn Cotter Pins Spec ↗
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Clevis Pin OD: 1/2" (12.7 mm)Cotter Pins: 1/8" × 1" (3.2 × 25 mm) 316 SS
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Secures the lower turnbuckle toggle jaws (3.2) to the port and starboard hull chainplates (3.5) and locks the upper and lower turnbuckle studs inside the open bronze turnbuckle barrels so they cannot unwind under rig vibration.
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Brand-New 1/2" Type 316 SS Clevis Pins + Single-Use 316 SS Split Cotter Pins (Never Use Ring-Dings on Turnbuckle Threads).Bend cotter pin legs only 15°–20° and wrap with self-amalgamating silicone rigging tape inside the turnbuckle boot.
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Fig. 25 — Hull #40 & Up Heavy Spec):
Island Packet upgraded the Upper Shrouds from 9/32" wire (Hulls #1–39) to 5/16" wire with 1/2" clevis pins on Hull #40 (nauti NAIDOO) & up. Pin-to-pin length (~45' 1" each) is measured from the upper masthead terminal bearing point (3.1) to the lower turnbuckle clevis pin (3.2) with the turnbuckle set at 2/3 open.
| Item # | Part Name & Location | Part Number & Verified Vendor Buy Links | Wire Size, Length & Pin Specs | Connection & Description | Recommended Type of Part & Notes |
|---|---|---|---|---|---|
| 4.1 |
Top Connector (Mast Wall-to-Forward Lower Shroud Terminal) Forward Slot Below Spreader Bracket at ~24' 0" (Port & Starboard, Qty 2 sets) |
T-Ball Terminal: Hayn 8TB932 ↗ / Rig-Rite Sparcraft 1/2" T-Ball for 9/32" wireMast Backing Plate: Sparcraft I-365E ↗ Stainless Twin-Slot T-Ball PlateAlt. Tang Option: Lower Shroud Tang + Hayn 12SMJ932 ↗ Swaged Jaw
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Wire Size: 9/32" (7.14 mm)T-Ball / Pin Size: 1/2" (12.7 mm) shankQuantity: 2× (1 Port, 1 Starboard)
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Connects the upper end of the port and starboard forward lower shrouds (4.3) into the forward slot of the stainless steel backing plate mounted on the Sparcraft I-365E ↗ mast wall immediately below the spreader root bracket (8.2).
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Factory Rotary-Swaged Type 316L SS T-Ball Terminal (Hayn 8TB932) + Inspect Mast Wall Backing Plate.Ensure the rubber/polymer T-ball retainer plug is seated behind each T-ball shank so the terminal cannot unhook when the rig is slack during stepping. |
| 4.2 |
Bottom Connector (Forward Lower Terminal Stud & Toggle Turnbuckle) At Port & Starboard Forward Lower Chainplates (Qty 2 sets) |
Open-Body Toggle Turnbuckle: Hayn 12ETJ ↗ (1/2"-20 UNF Chrome-Bronze Body w/ Forged 316 SS Lower Toggle Jaw)OEM Swage Stud: Hayn 12SS932 ↗ (1/2" thread for 9/32" wire)Mech. Stud Upgrade: Sta-Lok SL-036-932 ↗ or Hayn Hi-Mod 12CS932 ↗
Verified Vendor Buy / Order Links:
Buy Hayn 1/2" Open-Body Toggle Turnbuckle (Vela) ↗
Buy Hayn 1/2"-20 Open Turnbuckle Body (Vela) ↗
Hayn 12ETJ Open-Body Toggle Turnbuckle Spec ↗
Buy Hayn 12SS932 9/32"×1/2" Swage Stud (Vela) ↗
Buy Sta-Lok 9/32"×1/2" Stud 036-07 (Vela) ↗
Buy Hayn Hi-Mod 12CS932 Stud (Vela) ↗
|
Wire Size: 9/32" (7.14 mm)Thread: 1/2"-20 UNFChainplate Clevis Pin: 1/2" (12.7 mm) (Hull #40 & up heavy spec)Setting: Set at 2/3 Open for baseline measurement
|
Terminates the bottom end of each 9/32" forward lower shroud wire (4.3) and pins to the forward lower hull-side chainplate (4.4) via an integral forged lower toggle jaw (1/2" clevis pin). Controls mid-mast forward pre-bend and opposes the aft pull of the #5 Aft Lower Shrouds.
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Open-Body Chrome-over-Bronze Toggle Turnbuckle (Hayn 12ETJ or C.S. Johnson 26-508) + Swaged or Reusable Mechanical Stud.Per Fig. 25, Hull #40 (nauti NAIDOO) upgraded the forward lower turnbuckle pins from 7/16" to 1/2" to match the cap shrouds and aft lowers.
|
| 4.3 |
Forward Lower Shroud Wire (Port & Starboard) Spreader Root (~24' 0") to Forward Lower Hull Chainplate (Qty 2) |
OEM Package: Seco South IP320-40-FLS ↗Wire Spec: 316SS-1X19-932 ↗ (Type 316L Stainless)
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Diameter: 9/32" (7.14 mm)Pin-to-Pin Length: ~23' 8" (7.21 m) each (@ 2/3 open)Breaking Strength: ~10,300 lbs (4,672 kg) each
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Runs from the forward lower mast attachment below the spreaders (4.1) downward and forward (~16" forward of the mast centerline) to the forward lower hull chainplate (4.4). Prevents the middle of the Sparcraft in-mast furling spar from bowing aft or pumping in a seaway, keeping the internal mainsail furling extrusion straight so the mainsail furls without binding.
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Marine-Grade Type 316L 1×19 Stainless Steel Wire (9/32").Always replace port and starboard forward lower shrouds together with the aft lower shrouds ( #5) so mid-mast fore-and-aft tuning remains symmetrical.
|
| 4.4 |
Forward Lower Shroud Chainplate (Forward Hull-Side Chainplate) Port & Starboard Outboard Hull Sheer Forward of Cap Shroud (Fig. 22, Qty 2) |
OEM Chainplate: Seco South / Island Packet IP320-CP-FLS ↗Material: Electropolished Type 316L Stainless Steel Flat Bar
Verified Vendor Buy / Order Links:
Order OEM Forward Lower Chainplate (Seco South) ↗
Mack Sails Heavy 316L Island Packet Chainplates ↗
Island Packet Factory Parts (IPY Parts) ↗
|
Bar Stock: 1/4" × 2" × ~22" (6.35 × 50.8 mm) 316L SSPin Hole: 1/2" (12.7 mm) clevis pinPosition: Forwardmost of the 3 side chainplates |
Externally mounted Type 316L stainless steel chainplate bolted through the port and starboard hull sheer/bulwark ~16" forward of the upper shroud chainplate (3.5) and backed by glassed-in structural marine plywood knees (Fig. 22).
|
Inspect 1/2" Pin Hole & Exterior Sheer Bolts (Retain Existing 316L SS Chainplate).Check for any bedding compound separation along the top edge of the external sheer bar during seasonal haul-out. |
| 4.5 |
Forward Lower Turnbuckle Boots & Genoa Chafe Rollers Over Lower Turnbuckles & Lower 6' of Wire (Port & Starboard, Qty 2 sets) |
Turnbuckle Boots: Davis Instruments #1452 ↗ (for 1/2" turnbuckles) or Leather BootsShroud Rollers: Schaefer / Davis Snap-On Shroud Rollers for 9/32" (7 mm) wire
Verified Vendor Buy / Order Links:
Buy Davis #1452 Turnbuckle Boots (Fisheries) ↗
Buy Davis Cable & Shroud Covers (Fisheries) ↗
Buy Shroud Rollers (Vela) ↗
|
Boot Size: Fits 1/2" open-body bronze turnbuckleRoller Bore: 9/32" (7.14 mm) wire
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Because the forward lower shrouds sit forward of the mast, the foot and sheets of the 130% genoa sweep directly across them during every tack. Snap-on shroud rollers and turnbuckle boots allow the genoa foot and sheets to roll smoothly past the forward lowers without hanging up.
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Full-Length Ventilated Turnbuckle Boots + 9/32" Snap-On Shroud Rollers (Highly Recommended on Forward Lowers).
|
| 4.6 |
Forward Lower Clevis Pins & Split Cotter Pins Chainplate Toggle Jaws & Turnbuckle Threads (Port & Starboard, Complete Kit) |
Clevis Pins: Hayn CP12 ↗ (1/2" Type 316 SS, Qty 2–4)Cotter Pins: Suncor S0125-0031 ↗ (1/8" × 1" 316 SS Split Cotter Pins, Qty 6–8)
Verified Vendor Buy / Order Links:
Buy Hayn 1/2"×1" Clevis Pin 12CP (Vela) ↗
Hayn Clevis Pins Spec ↗
Buy 1/8"×1" 316 SS Cotter Pins (Vela) ↗
Hayn Cotter Pins Spec ↗
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Clevis Pin OD: 1/2" (12.7 mm)Cotter Pins: 1/8" × 1" (3.2 × 25 mm) 316 SS
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Secures the lower turnbuckle toggle jaws (4.2) to the port and starboard forward lower chainplates (4.4) and locks both threaded studs inside the open-body bronze turnbuckle barrels.
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Brand-New 1/2" Type 316 SS Clevis Pins + Single-Use 316 SS Split Cotter Pins.
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Fig. 25 — Hull #40 & Up Heavy Spec):
On Hull #40 (nauti NAIDOO) & up, the Forward Lower Shrouds use 9/32" wire with upgraded 1/2" clevis pins (earlier hulls #1–39 used 7/16" pins). Pin-to-pin length (~23' 8" each) is measured from the upper mast terminal bearing point (4.1) to the lower turnbuckle clevis pin (4.2) with the turnbuckle set at 2/3 open. When tuning the Sparcraft I-365E ↗ in-mast furling spar, tension the forward lowers (#4) and aft lowers (#5) equally so the mast section stays dead straight (zero pre-bend) for smooth mainsail furling.
| Item # | Part Name & Location | Part Number & Verified Vendor Buy Links | Wire Size, Length & Pin Specs | Connection & Description | Recommended Type of Part & Notes |
|---|---|---|---|---|---|
| 5.1 |
Top Connector (Mast Wall-to-Aft Lower Shroud Terminal) Aft Slot Below Spreader Bracket at ~24' 0" (Port & Starboard, Qty 2 sets) |
T-Ball Terminal: Hayn 8TB932 ↗ / Rig-Rite Sparcraft 1/2" T-Ball for 9/32" wireMast Backing Plate: Sparcraft I-365E ↗ Stainless Twin-Slot T-Ball PlateAlt. Tang Option: Lower Shroud Tang + Hayn 12SMJ932 ↗ Swaged Jaw
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Wire Size: 9/32" (7.14 mm)T-Ball / Pin Size: 1/2" (12.7 mm) shankQuantity: 2× (1 Port, 1 Starboard)
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Connects the upper end of the port and starboard aft lower shrouds (5.3) into the aft slot of the stainless steel backing plate on the Sparcraft I-365E ↗ mast wall directly below the spreader root bracket (8.2).
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Factory Rotary-Swaged Type 316L SS T-Ball Terminal (Hayn 8TB932) + Rubber T-Ball Retainer Plug.Inspect the aft slot of the stainless mast backing plate for any elongation or hairline cracking whenever the mast is unstepped. |
| 5.2 |
Bottom Connector (Aft Lower Terminal Stud & Toggle Turnbuckle) At Port & Starboard Aft Lower Chainplates (Qty 2 sets) |
Open-Body Toggle Turnbuckle: Hayn 12ETJ ↗ (1/2"-20 UNF Chrome-Bronze Body w/ Forged 316 SS Lower Toggle Jaw)OEM Swage Stud: Hayn 12SS932 ↗ (1/2" thread for 9/32" wire)Mech. Stud Upgrade: Sta-Lok SL-036-932 ↗ or Hayn Hi-Mod 12CS932 ↗
Verified Vendor Buy / Order Links:
Buy Hayn 1/2" Open-Body Toggle Turnbuckle (Vela) ↗
Buy Hayn 1/2"-20 Open Turnbuckle Body (Vela) ↗
Hayn 12ETJ Open-Body Toggle Turnbuckle Spec ↗
Buy Hayn 12SS932 9/32"×1/2" Swage Stud (Vela) ↗
Buy Sta-Lok 9/32"×1/2" Stud 036-07 (Vela) ↗
Buy Hayn Hi-Mod 12CS932 Stud (Vela) ↗
|
Wire Size: 9/32" (7.14 mm)Thread: 1/2"-20 UNFChainplate Clevis Pin: 1/2" (12.7 mm) (Hull #40 & up heavy spec)Setting: Set at 2/3 Open for baseline measurement
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Terminates the bottom end of each 9/32" aft lower shroud wire (5.3) and pins to the aft lower hull-side chainplate (5.4) via an integral forged lower toggle jaw (1/2" clevis pin). Provides aft mid-mast support opposing both the #2 Staysail Stay and the #4 Forward Lower Shrouds.
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Open-Body Chrome-over-Bronze Toggle Turnbuckle (Hayn 12ETJ or C.S. Johnson 26-508) + Swaged or Reusable Mechanical Stud.Per Fig. 25, Hull #40 (nauti NAIDOO) upgraded the aft lower turnbuckle pins from 7/16" to 1/2" so all 6 side shrouds (#3, #4, #5) share identical 1/2" chainplate pins.
|
| 5.3 |
Aft Lower Shroud Wire (Port & Starboard) Spreader Root (~24' 0") to Aft Lower Hull Chainplate (Qty 2) |
OEM Package: Seco South IP320-40-ALS ↗Wire Spec: 316SS-1X19-932 ↗ (Type 316L Stainless)
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Diameter: 9/32" (7.14 mm)Pin-to-Pin Length: ~23' 10" (7.26 m) each (@ 2/3 open)Breaking Strength: ~10,300 lbs (4,672 kg) each
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Runs from the aft lower mast attachment below the spreaders (5.1) downward and aft (~18" aft of the mast centerline) to the aft lower hull chainplate (5.4). Because the IP-320 has no intermediate shrouds or running backstays, the aft lower shrouds carry the primary load opposing the forward pull of the #2 Staysail Stay and the mainsail outhaul/furling loads.
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Marine-Grade Type 316L 1×19 Stainless Steel Wire (9/32").Note that the aft lower shrouds ( ~23' 10") are ~2" longer than the forward lower shrouds (~23' 8") due to the ~18" aft chainplate offset vs. ~16" forward offset; label them clearly before unstepping.
|
| 5.4 |
Aft Lower Shroud Chainplate (Aft Hull-Side Chainplate) Port & Starboard Outboard Hull Sheer Aft of Cap Shroud (Fig. 22, Qty 2) |
OEM Chainplate: Seco South / Island Packet IP320-CP-ALS ↗Material: Electropolished Type 316L Stainless Steel Flat Bar
Verified Vendor Buy / Order Links:
Order OEM Aft Lower Chainplate (Seco South) ↗
Mack Sails Heavy 316L Island Packet Chainplates ↗
Island Packet Factory Parts (IPY Parts) ↗
|
Bar Stock: 1/4" × 2" × ~22" (6.35 × 50.8 mm) 316L SSPin Hole: 1/2" (12.7 mm) clevis pinPosition: Aftmost of the 3 side chainplates |
Externally mounted Type 316L stainless steel chainplate bolted through the port and starboard hull sheer/bulwark ~18" aft of the upper shroud chainplate (3.5) and backed by glassed-in structural marine plywood knees (Fig. 22).
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Inspect 1/2" Pin Hole & Exterior Sheer Bolts (Retain Existing 316L SS Chainplate).Verify that the upper clevis pin hole is round and free of crevice staining. |
| 5.5 |
Aft Lower Turnbuckle Boots & Boom/Sheet Chafe Rollers Over Lower Turnbuckles & Lower 6' of Wire (Port & Starboard, Qty 2 sets) |
Turnbuckle Boots: Davis Instruments #1452 ↗ (for 1/2" turnbuckles) or Leather BootsShroud Rollers: Schaefer / Davis Snap-On Shroud Rollers for 9/32" (7 mm) wire
Verified Vendor Buy / Order Links:
Buy Davis #1452 Turnbuckle Boots (Fisheries) ↗
Buy Davis Cable & Shroud Covers (Fisheries) ↗
Buy Shroud Rollers (Vela) ↗
|
Boot Size: Fits 1/2" open-body bronze turnbuckleRoller Bore: 9/32" (7.14 mm) wire
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Covers the open-body bronze turnbuckles (5.2) and protects the working genoa sheets and squared-off main boom when sailing downwind with the boom eased near the aft lower shrouds.
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Full-Length Ventilated Turnbuckle Boots + 9/32" Snap-On Shroud Rollers.
|
| 5.6 |
Aft Lower Clevis Pins & Split Cotter Pins Chainplate Toggle Jaws & Turnbuckle Threads (Port & Starboard, Complete Kit) |
Clevis Pins: Hayn CP12 ↗ (1/2" Type 316 SS, Qty 2–4)Cotter Pins: Suncor S0125-0031 ↗ (1/8" × 1" 316 SS Split Cotter Pins, Qty 6–8)
Verified Vendor Buy / Order Links:
Buy Hayn 1/2"×1" Clevis Pin 12CP (Vela) ↗
Hayn Clevis Pins Spec ↗
Buy 1/8"×1" 316 SS Cotter Pins (Vela) ↗
Hayn Cotter Pins Spec ↗
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Clevis Pin OD: 1/2" (12.7 mm)Cotter Pins: 1/8" × 1" (3.2 × 25 mm) 316 SS
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Secures the lower turnbuckle toggle jaws (5.2) to the port and starboard aft lower chainplates (5.4) and locks both threaded studs inside the open-body bronze turnbuckle barrels.
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Brand-New 1/2" Type 316 SS Clevis Pins + Single-Use 316 SS Split Cotter Pins.
|
Fig. 25 — Hull #40 & Up Heavy Spec):
On Hull #40 (nauti NAIDOO) & up, the Aft Lower Shrouds use 9/32" wire with upgraded 1/2" clevis pins (matching #3 Upper Shrouds and #4 Forward Lower Shrouds). Pin-to-pin length (~23' 10" each) is measured from the upper mast terminal bearing point (5.1) to the lower turnbuckle clevis pin (5.2) with the turnbuckle set at 2/3 open. Because the aft lowers oppose the forward pull of the staysail stay (#2), always check mid-mast straightness up the mainsail furling slot when tensioning #4 and #5.
| Item # | Part Name & Location | Part Number & Verified Vendor Buy Links | Wire Size, Length & Pin Specs | Connection & Description | Recommended Type of Part & Notes |
|---|---|---|---|---|---|
| 6.1 |
Top Connector (Masthead-to-Backstay Upper Toggle & Terminal) Aft Masthead Twin Tangs → Upper Jaw Toggle / Swaged Jaw (Port & Starboard, Qty 2 sets) |
Masthead Aft Tangs: Sparcraft NG1 ↗ Twin Aft Stainless TangsSwaged Jaw Terminal: Hayn 7SMJ14 ↗ (7/16" pin Swaged Jaw for 1/4" wire)Optional Upper Toggle: Hayn 7FTJ ↗ (7/16" Forged Jaw Toggle) + 7SME14 ↗ Swaged Eye
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Wire Size: 1/4" (6.35 mm)Upper Clevis Pin: 7/16" (11.1 mm) or 1/2" at masthead tangQuantity: 2× (1 Port, 1 Starboard)
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Connects the upper ends of the port and starboard twin backstays (6.3) to the two angled aft stainless tangs welded/bolted into the back of the Sparcraft I-365E ↗ masthead weldment (8.1). Because the twin backstays splay outward to the port and starboard transom quarters, the upper terminal must align with both the aft rake angle and the outboard splay angle.
|
Factory Rotary-Swaged Jaw Terminal (Hayn 7SMJ14) + Forged 316 SS Jaw Toggle (Hayn 7FTJ) if Masthead Tang Is Fixed.Ensure full 2-axis articulation at the masthead so neither backstay upper swage experiences side-bending loads. |
| 6.2 |
Bottom Connector (Backstay Lower Terminal Stud & Toggle Turnbuckle) At Port & Starboard Transom Quarter Chainplates (Qty 2 sets) |
Open-Body Toggle Turnbuckle: Hayn 7ETJ ↗ (7/16"-20 UNF Chrome-Bronze Body w/ Forged 316 SS Lower Toggle Jaw)OEM Swage Stud: Hayn 7SS14 ↗ (7/16" thread for 1/4" wire)Mech. Stud Upgrade: Sta-Lok SL-036-14 ↗ or Hayn Hi-Mod 7CS14 ↗
Verified Vendor Buy / Order Links:
Buy Hayn 7/16" Open-Body Toggle Turnbuckle (Vela) ↗
Buy Hayn 7/16"-20 Open Turnbuckle Body (Vela) ↗
Hayn 7ETJ Open-Body Toggle Turnbuckle Spec ↗
Buy Hayn 7SS14 1/4"×7/16" Swage Stud (Vela) ↗
Buy Sta-Lok 1/4"×7/16" Stud 136-06 (Vela) ↗
Buy Hayn Hi-Mod 7CS14 1/4"×7/16" Stud (Vela) ↗
|
Wire Size: 1/4" (6.35 mm)Thread: 7/16"-20 UNFChainplate Clevis Pin: 7/16" (11.1 mm) (Hull #40 & up heavy spec)Setting: Set at 2/3 Open for baseline measurement
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Terminates the bottom end of each 1/4" backstay wire (6.3) and pins to the port and starboard transom quarter chainplates (6.4) via an integral forged lower toggle jaw (7/16" clevis pin). Controls masthead rake and directly tensions the #1 Headstay to limit genoa luff sag when sailing upwind.
|
Open-Body Chrome-over-Bronze Toggle Turnbuckle (Hayn 7ETJ or C.S. Johnson 26-507) + Swaged or Reusable Mechanical Stud.Per Fig. 25, Hull #40 (nauti NAIDOO) upgraded the twin backstay turnbuckles and pins from 3/8" (Hulls #1–39) to 7/16".
|
| 6.3 |
Twin Backstay Wire (Port & Starboard Split Standing Backstays) Masthead Aft Tangs to Port & Starboard Transom Quarters (Qty 2) |
OEM Package: Seco South IP320-40-BS ↗ (Hull #40 & Up Heavy Spec)Wire Spec: 316SS-1X19-14 ↗ (Type 316L Stainless)
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Diameter: 1/4" (6.35 mm) (Hull #40 & up; earlier hulls #1–39 used 7/32")Pin-to-Pin Length: ~46' 8" (14.22 m) each (@ 2/3 open)Breaking Strength: ~8,200 lbs each (16,400 lbs combined pair)
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Dual standing backstays running from the masthead aft tangs (6.1) to the port and starboard transom corners (6.4). Island Packet uses two independent full-time standing backstays (rather than a single backstay with a split bridal) for two reasons: (1) complete redundancy if one backstay or terminal ever fails offshore, and (2) an unobstructed centerline stern walk-through and folding swim ladder.
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Marine-Grade Type 316L 1×19 Stainless Steel Wire (1/4").Tension both port and starboard backstays equally with a Loos gauge so the masthead stays centered over the boat's centerline while providing ~12%–15% tension against the 9/32" headstay.
|
| 6.4 |
Transom Quarter Backstay Chainplates (Port & Starboard) Aft Hull/Transom Corners — Inside Port & Starboard Cockpit Lazarettes (Qty 2) |
OEM Chainplate: Seco South / Island Packet IP320-CP-BS ↗Material: Electropolished Type 316L Stainless Steel Flat Bar & Backing Plate
Verified Vendor Buy / Order Links:
Order OEM Transom Backstay Chainplates (Seco South) ↗
Mack Sails Heavy 316L Island Packet Chainplates ↗
Island Packet Factory Parts (IPY Parts) ↗
|
Bar Stock: 1/4" × 2" Type 316L SSPin Hole: 7/16" (11.1 mm) clevis pinInterior Access: Port & Starboard Lazarette Lockers |
Heavy stainless chainplates mounted at the port and starboard aft transom quarters. As verified in your 2026-10-26 Starboard Lazarette inspection (Item SL-10), the lower portion of the starboard backstay chainplate is bolted directly through the inside hull/transom corner inside the lazarette with a stainless backing plate and bonding wire.
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Inspect Inside Port & Starboard Lazarettes Annually + Re-Bed Deck Penetration as Needed. The lower bolts and backing plates are easily accessible inside the aft corners of the port and starboard cockpit lockers. |
| 6.5 |
Backstay Turnbuckle Boots & Stern Rail Fairleads / Standoffs Over Lower Turnbuckles at Stern Rail / Pushpit (Port & Starboard, Qty 2 sets) |
Turnbuckle Boots: Davis Instruments #1451 ↗ / #1452 ↗ (for 7/16" turnbuckles)Optional Accessories: Flag Halyard Eye / VHF or GPS Antenna Standoff
Verified Vendor Buy / Order Links:
Buy Davis #1451 / #1452 Turnbuckle Boots (Fisheries) ↗
Buy Davis Cable Covers (Fisheries) ↗
Buy 1/4" Shroud Rollers (Vela) ↗
|
Boot Size: Fits 7/16" open-body bronze turnbuckleWire Size: 1/4" (6.35 mm)
|
Covers the port and starboard backstay turnbuckles (6.2) and cotter pins right next to the cockpit helm seat and stern pushpit rails where crew hands and dock lines frequently pass.
|
Full-Length Ventilated Turnbuckle Boots (Open Bottom for Drainage). |
| 6.6 |
Twin Backstay Clevis Pins & Split Cotter Pins Masthead Aft Tangs, Quarter Chainplates & Turnbuckle Threads (Complete Kit) |
Lower Clevis Pins: Hayn CP716 ↗ (7/16" Type 316 SS, Qty 2)Upper Clevis Pins: Hayn CP716 ↗ / CP12 ↗ (Qty 2–4)Cotter Pins: Suncor S0125-0025 ↗ (3/32" × 1" 316 SS Split Cotter Pins, Qty 6–8)
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Clevis Pin OD: 7/16" (11.1 mm)Cotter Pins: 3/32" × 1" (2.4 × 25 mm) 316 SS
|
Secures the upper masthead backstay terminals (6.1) and lower transom quarter chainplate toggle jaws (6.2), and locks the upper and lower threaded studs inside both backstay turnbuckle barrels.
|
Brand-New 7/16" Type 316 SS Clevis Pins + Single-Use 316 SS Split Cotter Pins.
|
Fig. 25 — Hull #40 & Up Heavy Spec):
Island Packet upgraded the Twin Backstays from 7/32" wire with 3/8" pins (Hulls #1–39) to 1/4" wire with 7/16" clevis pins on Hull #40 (nauti NAIDOO) & up. Pin-to-pin length (~46' 8" each) is measured from the upper masthead terminal pin (6.1) to the lower turnbuckle clevis pin (6.2) with the turnbuckle set at 2/3 open. Combined breaking strength of the two 1/4" backstays is ~16,400 lbs—roughly 60% higher than the single 9/32" headstay (~10,300 lbs).
| Item # | Part Name & Location | Part Number & Verified Vendor Buy Links | Rod Size, Length & Pin Specs | Connection & Description | Recommended Type of Part & Notes |
|---|---|---|---|---|---|
| 7.1 |
Top Connector (Bowsprit Tip-to-Bobstay Upper Clevis Jaw) Underside of Bowsprit Tip Cranze Tang (Fig. 23A, Qty 1 set) |
Upper Clevis Jaw: Seco South IP320-BOB-UJ ↗ / Hayn 5/8"-18 UNF Heavy Forged Clevis JawBowsprit Tang: Seco South IP320-CRANZE ↗ Lower Eye
|
Thread: 5/8"-18 UNF internal threadClevis Pin: 1/2" (12.7 mm) ODJaw Opening: 1/2"–9/16" (fits 3/8" tang tongue)
|
Connects the top end of the solid-rod bobstay (7.3) to the lower downward-projecting lug of the bowsprit tip cranze fitting (directly underneath where the #1 Headstay 8" link plate 1.5 pins on top). Transfers the upward pull of the headstay and anchor rollers directly down into the bobstay rod.
|
Heavy Forged Type 316L / Nitronic 50 Clevis Jaw Terminal (1/2" Clevis Pin).Inspect the upper jaw cheeks and 1/2" pin hole for any distortion or rust bleeding during every haul-out.
|
| 7.2 |
Bottom Connector (Bobstay-to-Bow Cutwater Stem Eye Connector) At Bow Stem Cutwater Above Waterline (Fig. 23B–C, Qty 1 set) |
Lower Clevis Jaw: Seco South IP320-BOB-LJ ↗ / Hayn 5/8"-18 UNF Forged Clevis JawHull Stem Eye: Island Packet IP320-STEM-EYE ↗ (Thru-Bolted 316L SS / Bronze Stem Plate)
Verified Vendor Buy / Order Links:
Order OEM Bobstay Lower Clevis & Stem Eye (Seco South) ↗
Island Packet Factory Parts (IPY Parts) ↗
Hayn H120 Rod Clevis Jaw Spec ↗
|
Thread: 5/8"-18 UNFClevis Pin: 1/2" (12.7 mm) ODStem Bolt Access: Inside forward anchor/chain locker |
Connects the bottom end of the solid-rod bobstay (7.3) to the heavy stainless/bronze stem eye fitting through-bolted horizontally through the solid fiberglass bow stem just above the waterline (Fig. 23B–23C). Anchors the entire cutter foretriangle load into the solid fiberglass bow stem.
|
Forged Type 316L SS Clevis Jaw + Inspect Through-Bolted Stem Eye & Backing Plate Inside Anchor Locker. Because the lower bobstay jaw sits in the constant bow-wave splash zone, rinse with fresh water and check the 1/2" clevis pin and cotter pin before and after every offshore passage.
|
| 7.3 |
Solid-Rod Bobstay Bar (Bowsprit Structural Tie-Down Rod) Bowsprit Tip Cranze Tang to Bow Stem Cutwater (Fig. 23A–C & Fig. 25, Qty 1) |
OEM Package: Seco South IP320-40-BOB ↗Material Spec: 5/8" Solid Type 316L or Nitronic 50 Stainless Steel Bar
|
Rod Diameter: 5/8" (15.9 mm) solid round barPin-to-Pin Length: ~4' 4" (52.0" / 1.32 m)Tensile Capacity: >18,000 lbs
|
Per factory drawings Fig. 23A–23C and Fig. 25, Island Packet uses a solid stainless steel rod (rather than 1×19 stranded wire) for the bobstay. A solid rod has no internal wire strands to trap salt water and suffer hidden crevice corrosion in the bow wave, and resists damage from anchor chains and mooring pendants.
|
Retain & Polish Solid 5/8" Type 316L / Nitronic 50 Rod (Or Replace with New Seco South Solid Rod Assembly if Threads Are Pitted).Never replace the solid-rod bobstay with stranded 1×19 wire without a protective PVC/urethane chafe sleeve against the anchor chain.
|
| 7.4 |
Bobstay Threaded Adjustment Ends & Locking Jam Nuts Upper & Lower Threaded Rod Ends (Fig. 23A–C, Qty 1 set) |
Adjustment Threads: Machined 5/8"-18 UNF Rod ThreadsLocking Jam Nuts: 2× Type 316L SS Heavy Hex Jam Nuts (5/8"-18 UNF)
|
Thread Spec: 5/8"-18 UNFAdjustment Range: ~2.0" (50 mm) total thread engagement
|
Per Fig. 23A–23C ( Bobstay Installation & Adjustment Procedure), the bobstay is tensioned via its threaded clevis jaw ends and locked with heavy stainless jam nuts to pre-load the molded bowsprit downward slightly (~1/16"–1/8") before tensioning the #1 Headstay.
|
Coat 5/8"-18 Threads with Tef-Gel® or MareLube™ Anti-Seize Before Locking Jam Nuts.Always slack the #1 Headstay and #6 Twin Backstays before turning the bobstay adjustment threads so the 5/8" stainless threads never gall under load.
|
| 7.5 |
Bobstay High-Load Clevis Pins & Heavy Split Cotter Pins Upper Bowsprit Cranze Tang & Lower Cutwater Stem Eye (Qty 2 sets) |
Clevis Pins: Hayn CP12 ↗ (1/2" Type 316L / Nitronic 50 Clevis Pins, Qty 2)Cotter Pins: Suncor S0125-0032 ↗ (1/8" × 1-1/4" 316 SS Split Cotter Pins, Qty 2)
Verified Vendor Buy / Order Links:
Buy Hayn 1/2"×1-1/2" Clevis Pin CP12112 (Vela) ↗
Buy Hayn 1/2"×1" Clevis Pin 12CP (Vela) ↗
Buy 1/8" 316 SS Cotter Pins (Vela) ↗
Hayn Clevis Pins Spec ↗
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Clevis Pin OD: 1/2" (12.7 mm) × ~1-1/2" gripCotter Pins: 1/8" × 1-1/4" (3.2 × 32 mm) 316 SS
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The two 1/2" bobstay clevis pins carry the entire multiplied downward reaction force of the #1 Headstay, genoa halyard/sheet loads, and bowsprit anchor rollers. Because the lower pin sits near the waterline and can be struck by mooring lines or anchor chains, cotter pin security here is critical.
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Replace Both 1/2" Clevis Pins & Heavy 1/8" Split Cotter Pins Every 3–5 Years (Never Use Ring-Dings on the Bobstay).Wrap the lower cotter pin smoothly with self-amalgamating silicone tape so mooring pennants cannot catch the cotter pin legs and pull the pin out. |
Fig. 23A–23C — Bobstay Details & Adjustment):
The Bobstay is the structural foundation of the Island Packet 320's integral bowsprit and outer forestay (#1 Headstay). Because the bobstay meets the bowsprit at a shallow angle (~28°–30°), tension in the #1 Headstay induces roughly 1.6× to 1.8× higher tension in the Bobstay. Always inspect the two 1/2" bobstay clevis pins (7.5), the bowsprit cranze tang (7.1), and the cutwater stem eye (7.2) at every haul-out.
| Item # | Part Name & Location | Part Number & Verified Vendor Buy Links | Dimensions, Section & Fastener Specs | Connection & Description | Recommended Type of Part & Notes |
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| 8.1 |
Masthead Rigging Weldment, Halyard Sheaves & Wind Transducer Mount Top of Sparcraft I-365E Mast at 47' 7" Above DWL (Qty 1 assembly) |
Masthead Cap: Sparcraft / Rig-Rite NG1 ↗ Welded Aluminum Masthead AssemblyHalyard Sheaves: 4× Rig-Rite 90 mm Delrin Halyard Sheaves w/ Bronze BushingsWind Transducer: Updated Raymarine E22078 ↗ / R28170 ↗ Egg-Shaped Rotavecta
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Height Above DWL: 47' 7" (spar) / 48' 1" (overall)Forward Pin: 1/2" Forestay Tang (1.1)Aft Pins: 2× 7/16" / 1/2" Backstay Tangs (6.1)
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Structural aluminum masthead cap housing the forward stainless tang for the #1 Headstay (1.1), twin aft stainless tangs for the #6 Twin Backstays (6.1), four 90 mm halyard sheaves (2 forward, 2 aft), anchor light, VHF whip antenna, and your updated forward-canting Raymarine E22078 ↗ masthead wind transducer.
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Inspect Welds, Replace Worn Delrin Halyard Sheaves & Check 5-Pin Twist-Lock Wind Connector When Unstepped. Check the stainless clevis pin bushings inside the forward forestay tang and twin aft backstay tangs for ovaling whenever the mast is down. |
| 8.2 |
Single Airfoil Spreaders & Through-Mast Compression Bracket Mid-Mast at ~24' 6" Above Deck (Port & Starboard Pair, Qty 2) |
Airfoil Spreaders: Sparcraft / Rig-Rite Anodized Aluminum Airfoil Section (1 Pair) Internal Root Bracket: Sparcraft Stainless Steel Through-Mast Spreader Bar Deck Lights: Spreader-mounted foredeck floodlights (optional)
Verified Vendor Buy / Order Links:
Rig-Rite Isomat / Sparcraft Airfoil Spreaders ↗
Rig-Rite NG-46 / I-365E Spreader Brackets ↗
Buy Molded Spreader Boots (Vela) ↗
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Spreader Length: ~3' 9" (45.0" / 1.14 m) eachSweep Angle: 0° Inline (athwartships)Dihedral Angle: ~6° upward tilt
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Single inline anodized aluminum airfoil spreaders mounted on a heavy internal stainless steel compression bar passing straight through the Sparcraft I-365E ↗ mast section at ~24' 6" above deck. Holds the #3 Upper Shrouds (3.3) outboard at a wide staying angle while allowing the main boom to ease far outboard running downwind.
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Inspect Spreader Root Pins & Confirm ~6° Upward Bisecting Angle at Outer Tips (3.4).Never allow spreader tips to droop below horizontal; drooping tips put downward bending stress on the spreader root bracket under cap-shroud compression. |
| 8.3 |
Keel-Stepped In-Mast Furling Spar, Deck Partner Collar & Keel Step Shoe Masthead through Coachroof Partner to Keel Floor Timber (Fig. 17, Qty 1 system) |
Mast Extrusion: Sparcraft / Charleston Spar I-365E ↗ In-Mast Furling SparDeck Partner Collar: Island Packet Cast Aluminum Deck Ring + Molded Rubber Wedge & Boot ( Fig. 17)Keel Step Shoe: Cast Aluminum Hinged/Socketed Mast Step w/ Delrin Isolation Pad
Verified Vendor Buy / Order Links:
Rig-Rite Sparcraft I-365E Furling Mast & Step (IM260-5) ↗
Rig-Rite Sparcraft Furling Masts Catalog ↗
Island Packet Factory Parts (IPY Parts) ↗
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Section Profile: 7-7/8" × 4-7/8" (200 × 124 mm)Total Spar Length: ~50' 0" (15.24 m)Cabin Bury: ~5' 9" (1.75 m) deck to keel step
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Anodized aluminum keel-stepped spar housing the internal mainsail roller-furling mandrel and drum. Passes through the coachroof partner collar (Fig. 17, wedged with a 360° rubber partner wedge and sealed with a vinyl/canvas mast boot) and steps on a cast aluminum shoe bolted to the structural fiberglass keel floor timber with a heavy copper/tinned lightning ground strap.
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Keep Keel Step Drain Limber Holes Clear, Inspect Delrin Base Pad & Maintain UV Cover Over Deck Mast Boot. Standing bilge water around an aluminum mast heel causes galvanic pitting; ensure the cast step sits on its composite/Delrin isolation pad and drains freely to the deep bilge sump. |
| 8.4 |
Bowsprit Tip Cranze Tang & Dual Anchor Roller Weldment Forward Nose of Integral Molded Bowsprit at J = 14' 8" (Fig. 23A, Qty 1) |
OEM Weldment: Seco South / Island Packet IP320-CRANZE ↗Material: Heavy Welded & Electropolished Type 316L Stainless Steel
Verified Vendor Buy / Order Links:
Order OEM Bowsprit Cranze Tang Weldment (Seco South) ↗
Seco South Custom Stainless Marine Weldments ↗
Island Packet Factory Parts (IPY Parts) ↗
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Upper Pin Eye: 1/2" (12.7 mm) for Headstay 8" Link Plate (1.5)Lower Pin Eye: 1/2" (12.7 mm) for Bobstay Upper Jaw (7.1)
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Structural stainless steel cap and tang weldment wrapping the nose of the integral fiberglass bowsprit. Connects the upward pull of the #1 Headstay (1.5) on top directly to the downward anchor of the #7 Bobstay (7.1) underneath, while integrating the twin stainless anchor rollers.
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Dye-Penetrant Inspect Upper & Lower 1/2" Tang Welds During Every Re-Rigging.Because the headstay and bobstay pull directly against each other through this single weldment, inspect both 1/2" pin eyes and side cheek bolts regularly.
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| 8.5 |
Bow Cutwater Stem Eye Fitting (Lower Bobstay Hull Anchor) Solid Fiberglass Bow Cutwater Just Above Waterline (Fig. 23B–C, Qty 1) |
OEM Stem Fitting: Island Packet / Seco South IP320-STEM-EYE ↗Material: Heavy Cast Manganese Bronze or Type 316L SS Tang w/ Internal Backing Plate
Verified Vendor Buy / Order Links:
Order OEM Cutwater Stem Eye Fitting (Seco South) ↗
Island Packet Factory Parts (IPY Parts) ↗
Mack Sails Custom IP Stem & Chainplate Hardware ↗
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Clevis Pin Hole: 1/2" (12.7 mm) OD for Bobstay Lower Jaw (7.2)Mounting: Horizontally thru-bolted through solid bow stem |
Heavy stem tang passing into the solid hand-laid fiberglass bow stem above the waterline and secured inside the forward anchor locker with a backing plate and heavy stainless thru-bolts (Fig. 23B–23C). Serves as the lower anchor point for the #7 Bobstay (7.2).
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Inspect Exterior Stem Bedding & Internal Anchor-Locker Backing Nuts Annually. Check for any weeping or rust tracks inside the very bottom of the forward anchor locker. |
| 8.6 |
Complete Hull-Side Shroud & Transom Backstay Chainplate Set 6× Hull Sheer Chainplates (#3, #4, #5) + 2× Transom Quarter Chainplates (#6) (Fig. 22, Qty 8 total) |
Side Chainplates (×6): Seco South IP320-CP-SIDE ↗ (1/4" × 2" Type 316L SS, 1/2" pin)Backstay Chainplates (×2): Seco South IP320-CP-BS ↗ (1/4" × 2" Type 316L SS, 7/16" pin)
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Side Chainplate Pins: 6× 1/2" (12.7 mm)Backstay Pins: 2× 7/16" (11.1 mm)Foredeck Tangs: 2× 1/2" (Headstay & Staysail)
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Per Fig. 22 (Chainplate Detail), all 6 side shroud chainplates on the IP-320 bolt externally to the hull sheer/bulwark into glassed-in structural knees rather than penetrating the balsa-cored side decks—one of Island Packet's best structural features because it prevents hidden core rot and crevice corrosion inside deck slots.
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Inspect External Chainplates Visually & Torque Interior Backing Nuts Every 5 Years. Clean and polish the exposed stainless flat bars with Spotless Stainless or Flitz to maintain a passive chromium-oxide surface film.
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Fig. 2, Fig. 17, Fig. 22, Fig. 23A–C & Fig. 25):
nauti NAIDOO (2000 Island Packet 320, Hull #40) carries 10 standing 1×19 Type 316L stainless wires + 1 solid-rod bobstay built to the upgraded Hull #40 & Up Heavy Rigging Specification:
#1 Headstay (9/32" wire, ~45' 6", 1/2" pins),
#2 Staysail Stay (9/32" wire, ~34' 2", 1/2"/7/16" pins),
#3 Upper Shrouds ×2 (5/16" wire, ~45' 1", 1/2" pins),
#4 Forward Lower Shrouds ×2 (9/32" wire, ~23' 8", 1/2" pins),
#5 Aft Lower Shrouds ×2 (9/32" wire, ~23' 10", 1/2" pins),
#6 Twin Backstays ×2 (1/4" wire, ~46' 8", 7/16" pins), and
#7 Bobstay (5/8" solid rod, ~4' 4", 1/2" pins).