SeaChoice Stainless Cotter Pin 5/32" x 1" – 18-8 SS Bulk Pack | SKU 50-01089

Marine-grade 18-8 stainless steel cotter pins in a 5/32" diameter × 1" length, sold as a bulk pack. Cotter pins are essential hardware for retaining castellated (slotted) nuts, clevis pins, and other mechanical fasteners throughout a boat — insert through the drilled hole and bend the legs to lock the connection in place and prevent loosening from vibration.

18-8 stainless steel provides strong corrosion resistance for fresh water and salt water marine environments, making these a better long-term choice than plated or zinc cotter pins for onboard applications.

Compatible Applications

• Castellated (slotted) nut retention on steering, engine, and drive components
• Clevis pin and toggle retention in rigging, throttle, and control cables
• General mechanical hardware retention wherever a 5/32" hole is specified
• Marine hardware, deck fittings, and through-hole fastener applications
• Fresh water and salt water environments — 18-8 stainless provides corrosion resistance for marine use

Part Information

• Brand: SeaChoice
• SKU: 50-01089
• Type: Cotter pin (split pin)
• Diameter: 5/32"
• Length: 1"
• Material: 18-8 stainless steel
• Format: Bulk pack of 50 pins
• Condition: New

Installation Notes

• Insert the cotter pin through the hole in the shaft or pin with the loop end seated against the edge
• Bend one or both legs outward to lock the pin in position — bending just one leg is typically sufficient for most retention applications
• Do not over-bend or re-bend repeatedly — multiple bends weaken the pin and reduce its holding effectiveness
• Replace cotter pins any time they are straightened for disassembly — they are a single-use fastener
• Confirm the pin diameter fits the hole snugly — an oversized hole reduces retention; an undersized hole won’t allow installation

Other Stainless Cotter Pin Sizes

• SeaChoice Stainless Cotter Pin 3/32" × 1-1/4"
• SeaChoice Stainless Cotter Pin 1/8" × 1-1/4"
• SeaChoice Stainless Cotter Pin 1/8" × 1-1/2"
• SeaChoice Stainless Cotter Pin 1/8" × 2"

Parts Desk Insights

Cotter pins are one of those consumables that every boat should have aboard in a range of sizes — the best use case for the 5/32" × 1" is anywhere a castellated nut or clevis pin calls for a cotter pin at that diameter, which comes up frequently in steering, throttle, and drive hardware. The bulk pack format makes sense for shops and anyone doing regular maintenance across a fleet. The most important thing to know is that cotter pins are single-use — once bent, they should be replaced rather than straightened and reused. Stainless is the right choice for marine environments; plated steel cotter pins corrode quickly in salt air and will often seize in the hole, making removal difficult. If you’re not sure which diameter you need, the hole in your shaft or pin is the reference — the cotter pin should fit through snugly without forcing.