Sierra 18-3744-9 Cotter Pin, 3/32 x 3/4 Inch, Replaces 552906, Pack of 10

The Sierra 18-3744-9 Cotter Pin is a marine-grade cotter pin sized 3/32 inch x 3/4 inch, sold in a package of ten. Cotter pins like this one are used to lock a castellated prop nut in place on the propeller shaft, preventing the nut from backing off during operation, and are also used in other fastener and linkage points on an outboard or stern drive that call for this size pin. Because they are inexpensive and take direct load and vibration over time, cotter pins are a routine replacement item any time a prop nut, spacer, or similar hardware is removed and reinstalled -- carrying spares in this size means you are never stuck reusing a bent or fatigued pin.

Each package contains ten individual pins so you have enough on hand for multiple service jobs or to keep as spares in a toolbox. The 18-3744-9 is interchangeable with several OEM and aftermarket references, making it a straightforward stock replacement across GLM, Johnson/Evinrude Outboard, OMC Stern Drive, and Volvo Penta applications that call for a cotter pin of this same 3/32 inch x 3/4 inch size.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3744-9
• Pin Type: Cotter Pin
• Size: 3/32 inch x 3/4 inch
• Quantity: Pack of 10
• Weight: 0.02 pounds
• UPC: 808282164652

Fitment

Sized 3/32 inch x 3/4 inch for use anywhere a cotter pin of this size is called for, including securing a propeller nut on the shaft.

Replaces (OEM)

• GLM 22140
• Johnson/Evinrude Outboard 552906
• OMC Stern Drive 3852255
• Volvo Penta 3852255

Frequently Asked Questions

What size is the Sierra 18-3744-9 cotter pin? It measures 3/32 inch x 3/4 inch.

How many pins come in a package? The 18-3744-9 is sold in a package of ten cotter pins.

What is this cotter pin used for? It is commonly used to lock a castellated prop nut onto the propeller shaft so the nut cannot back off, and it can serve any other fastener location on an outboard or stern drive that calls for a 3/32 inch x 3/4 inch cotter pin.

Is the 18-3744-9 interchangeable with other brands' cotter pins? Yes, it is interchangeable with GLM 22140, Johnson/Evinrude Outboard 552906, OMC Stern Drive 3852255, and Volvo Penta 3852255.

Does Sierra 18-3744-9 replace Johnson/Evinrude part 552906? Yes, the 18-3744-9 is a direct interchange for Johnson/Evinrude Outboard 552906.

What is the UPC for this product? The Sierra 18-3744-9 cotter pin package carries UPC 808282164652.

How much does a package weigh? A package of ten 18-3744-9 cotter pins weighs 0.02 pounds.

Can I use this cotter pin for something other than a propeller nut? Yes, since it is a standard 3/32 inch x 3/4 inch cotter pin, the 18-3744-9 can be used anywhere that size pin is specified, not only on a propeller nut.

Are these genuine Sierra parts or generic replacements? They are genuine Sierra 18-3744-9 cotter pins, manufactured to meet or exceed the original equipment part they replace.

Why should I replace the cotter pin instead of reusing the old one? A cotter pin is a single-use locking fastener; once bent open and removed, it should not be reused, so a fresh 18-3744-9 pin should go in whenever the prop nut or other secured hardware is taken off.

Does the 18-3744-9 fit Volvo Penta applications? Yes, it is interchangeable with Volvo Penta 3852255.

What is included when I order this listing? You receive one package containing ten Sierra 18-3744-9 cotter pins sized 3/32 inch x 3/4 inch.