Description
The Sierra 18-3726 Prop Nut is an aftermarket brass castle hex nut designed to keep boat propellers tightly seated against the shaft taper. It serves as a direct replacement for original equipment manufacturer (OEM) hardware on a wide variety of mid-to-high-horsepower Suzuki and Yamaha outboard motors.
Product Specifications
The part is constructed out of machined marine-grade brass to withstand harsh saltwater and freshwater environments.
| Specification | Detail |
| Thread Size | M18 - 2.5 |
| Nut Thickness | 7/8 inch |
| Wrench/Socket Size | 1 1/2 inch |
| Material | SAE 360 Brass |
| Thread Direction | Clockwise |
Engine Compatibility
This propeller nut fits a broad assortment of outboard setups, specifically all V-4 and V-6 applications (except D150 models).
- Suzuki Marine: Fits 50, 75, 85, 90, 140, 150, 175, 200, 225, and 250 HP DF and DT model outboards.
- Yamaha Marine: Fits 115, 130, 150, 200, 225, 250, and 300 HP outboard motors.
OEM Cross References
The Sierra 18-3726 can be used interchangeably with the following manufacturer and aftermarket part numbers:
- Suzuki: 09141-18005
- Yamaha: 90171-18M04-00
- GLM: 21241
- Mallory Marine: 9-73909
