Sierra 18-3782 Prop Nut Kit, White - Stainless Steel M14 Prop Nut, Spacer, Cotter Pin

The Sierra 18-3782 Prop Nut Kit is a complete stainless steel hardware set for securing an outboard propeller to the shaft. The kit is finished in white and includes a machined prop nut, a spacer, and a cotter pin, giving you every fastener needed to reinstall or replace worn prop hardware in one purchase rather than sourcing each piece separately. The prop nut uses an M14 thread with a Class 2A right-hand Unified National Coarse (UNC) thread and a hex head/hex fastener design for a secure, wrench-ready fit. Built from stainless steel, the kit resists the corrosion and salt exposure common in marine environments, helping the nut, spacer, and cotter pin hold up over repeated prop removal and reinstallation. The individual components are packaged together as a 4-piece set, so boaters performing routine propeller maintenance, prop swaps, or shear-pin/hub service have matched hardware on hand. The Sierra 18-3782 is interchangeable with GLM 21251, Mallory 9-73992, and Yamaha 6G5-W4599-00-00, making it a straightforward replacement option when those cross-reference numbers are called out on an existing setup.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3782
• Product Type: Prop Nut Kit
• Color: White
• Material: Stainless Steel
• Thread Size: M14
• Thread Type: Unified National Coarse (UNC)
• Thread Style: Right Hand
• Thread Class: Class 2A
• Fastener Type: Hex
• Screw Head Style: Hex
• Number of Pieces: 4
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 0.56 pounds
• UPC: 808282240622
• Kit Contents: 18-3726 Prop Nut, 18-3735 Cotter Pin, 18-4274 Prop Spacer
• Cross Reference / Interchange Numbers: GLM 21251, Mallory 9-73992, Yamaha 6G5-W4599-00-00

Replaces (OEM)

• GLM 21251
• Mallory 9-73992
• Yamaha 6G5-W4599-00-00

Frequently Asked Questions

What is included in the Sierra 18-3782 Prop Nut Kit? The kit contains three components: an 18-3726 prop nut, an 18-3735 cotter pin, and an 18-4274 prop spacer, packaged together as a 4-piece set.

What thread size does the 18-3782 prop nut use? The prop nut in the Sierra 18-3782 kit has an M14 thread with a Class 2A right-hand Unified National Coarse (UNC) thread pattern.

What material is the Sierra 18-3782 Prop Nut Kit made from? It is made from stainless steel, which resists corrosion from saltwater and freshwater exposure.

Is the Sierra 18-3782 kit interchangeable with other brands? Yes, the Sierra 18-3782 Prop Nut Kit is interchangeable with GLM 21251, Mallory 9-73992, and Yamaha 6G5-W4599-00-00.

What color is the 18-3782 Prop Nut Kit? The Sierra 18-3782 Prop Nut Kit is finished in white.

How much does the Sierra 18-3782 Prop Nut Kit weigh? The kit weighs 0.56 pounds.

What are the dimensions of the components in the 18-3782 kit? The individual components measure approximately 0.39 x 0.39 x 0.39 inches each.

Does the 18-3782 kit include a cotter pin? Yes, an 18-3735 cotter pin is included along with the 18-3726 prop nut and 18-4274 prop spacer.

What style of nut is used in the Sierra 18-3782 kit? The prop nut has a hex head with a hex fastener design for use with a standard wrench or socket.

Is the Sierra 18-3782 Prop Nut Kit a genuine Sierra part? Yes, 18-3782 is the Sierra part number for this Prop Nut Kit, sold as a matched 4-piece hardware set.