Sierra 18-2380-9 Cotter Pin, Pack of 10, Yamaha Outboard Prop Nut Hardware, Replaces 91490-30030-00

The Sierra 18-2380-9 is a package of 10 cotter pins built to original equipment specifications for Yamaha outboard prop nut hardware. Cotter pins are a small but critical piece of outboard prop hardware: they lock the propeller nut in place on the prop shaft so vibration and water pressure cannot back it off, which protects the propeller from working loose or being lost during operation. Because they are a wear item that should be replaced (not reused) any time the propeller is removed for service, having a full pack of 10 on hand covers multiple prop changes or a season of routine maintenance across more than one boat.

Each pin in this pack is finished in a grey tone and sized at 0.39 x 0.39 x 0.39 inches. The 18-2380-9 is manufactured to meet or exceed the original equipment part it replaces, making it a direct fit for the Yamaha prop nut hardware it is designed for.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2380-9
• Product Type: Cotter Pin
• Pack Quantity: 10 cotter pins
• Pin Type: Cotter
• Color: Grey
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.04 pounds
• Fitment: Yamaha outboard prop nut hardware

Fitment

Designed for Yamaha outboard propeller nut hardware.

Replaces (OEM)

• 91490-30030-00
• 91401-30028-00
• 91401-30030-00
• 91402-30022-00
• 91402-30022-09
• 91402-30028-00
• 91402-30028-09
• 91490-30022-00
• 91490-30025-00
• GLM 22090
• Mallory 9-73911

Frequently Asked Questions

What is the Sierra 18-2380-9 cotter pin used for? It locks the propeller nut onto a Yamaha outboard prop shaft so vibration and water pressure cannot back the nut off, keeping the propeller securely in place during operation.

How many pins come in a pack of the 18-2380-9? Each package of the Sierra 18-2380-9 contains 10 cotter pins.

What size are the 18-2380-9 cotter pins? Each pin measures 0.39 x 0.39 x 0.39 inches.

How much does a pack of 18-2380-9 cotter pins weigh? A package of the Sierra 18-2380-9 weighs 0.04 pounds.

Which OEM part numbers does the 18-2380-9 cotter pin replace? Sierra 18-2380-9 replaces Yamaha 91490-30030-00, 91401-30028-00, 91401-30030-00, 91402-30022-00, 91402-30022-09, 91402-30028-00, 91402-30028-09, 91490-30022-00, and 91490-30025-00, as well as GLM 22090 and Mallory 9-73911.

Is the Sierra 18-2380-9 a genuine Yamaha part or aftermarket? It is an aftermarket cotter pin manufactured to meet or exceed the original equipment Yamaha part it replaces, rather than a Yamaha-branded part.

What color are these cotter pins? The 18-2380-9 cotter pins are finished in grey.

Can cotter pins be reused after removing the prop nut? Cotter pins are a wear item meant to be replaced each time the propeller nut is removed, which is why the Sierra 18-2380-9 comes packaged in a set of 10 for repeated servicing.

What is included in a package of the Sierra 18-2380-9? The package includes 10 individual cotter pins sized for Yamaha outboard prop nut hardware.

Will the 18-2380-9 fit any outboard brand's prop hardware? The Sierra 18-2380-9 is designed for Yamaha outboard prop nut hardware and cross-references specifically to Yamaha OEM cotter pin numbers.