Sierra Stainless Steel Cotter Pin 18-3741-9, Pack of 10, for Outboard Propeller Nuts

The Sierra 18-3741-9 is a stainless steel cotter pin used to secure outboard propeller nuts in place, preventing the nut from backing off during operation. Cotter pins are a required part of a proper propeller installation, and stainless steel construction resists the corrosion that comes from constant saltwater or freshwater exposure below the waterline. This item is sold as a package of 10 pins, giving you enough on hand for routine propeller service, seasonal maintenance, or keeping spares in the boat for on-water prop changes.

Installing a fresh cotter pin any time a propeller nut is removed and reinstalled is standard practice, since a bent or reused pin is more likely to fail. The compact size and light weight make this an easy item to keep in a tackle box or tool kit alongside other prop hardware.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3741-9
• Material: Stainless Steel
• Package Quantity: 10 cotter pins per package
• Weight: 0.07 pounds
• UPC: 808282164621
• Application: Outboard propeller nut hardware

Frequently Asked Questions

What is the Sierra 18-3741-9 cotter pin used for? It secures an outboard propeller nut so the nut cannot back off the propeller shaft during operation, part number 18-3741-9.

How many cotter pins come in a package? The 18-3741-9 is sold as a package of 10 stainless steel cotter pins.

What material is the 18-3741-9 cotter pin made from? Stainless steel, chosen for corrosion resistance in a marine environment.

How much does a package of 18-3741-9 cotter pins weigh? A package weighs 0.07 pounds.

Should a cotter pin be reused after removing a propeller? No, a new cotter pin such as the Sierra 18-3741-9 should be installed any time the propeller nut is removed, since a bent or previously bent pin is more prone to failure.

Is the 18-3741-9 cotter pin only for Evinrude outboards? It is listed for outboard propeller nut applications; the Sierra 18-3741-9 part number should be matched to your specific propeller nut and shaft hardware before ordering.

What is the UPC for this product? The UPC for the Sierra 18-3741-9 package of cotter pins is 808282164621.

Is a cotter pin the same as a keeper clip? No, a cotter pin is a separate piece of hardware from a nut keeper; the 18-3741-9 is specifically a cotter pin, not a keeper.

What is included when I order the 18-3741-9? You receive one package containing 10 stainless steel cotter pins, part number 18-3741-9.

Why choose a genuine Sierra cotter pin over a generic one? The Sierra 18-3741-9 is manufactured in stainless steel to hold up to marine conditions, giving a consistent fit and corrosion resistance for propeller nut retention.