Towing Equipment› Hitches

SIERRAMARINE

18mm Castellated Propeller Nut

$12.51

SKU: S08C 18-3726

In Stock
In Stock
Ships by Aug 30
Free Shipping over $200
$100 Minimum Order
Non-Returnable Item
INSTALL DIFFICULTY
DIY PRO SHOP

Beginner — under 30 min

Overview

The Sierra 18-3726 is an 18mm castellated propeller nut made of bronze. This propeller nut is also interchangeable with various OEM and aftermarket part numbers.

This component is also compatible with Yamaha sterndrives and Nissan/Tohatsu BFT series outboards. Its specifications include an 18mm size and a castellated type, ensuring a secure fit for your marine propulsion system.
Show original supplier description
The Sierra 18-3726 is a bronze, 18mm castellated propeller nut designed for a range of marine outboard and sterndrive applications. This durable component ensures a secure fit for your propeller, contributing to efficient operation and longevity. This propeller nut is specifically compatible with Evinrude/Johnson, BRP, Suzuki, Honda, and Yamaha outboard motors. For Evinrude/Johnson, it fits 50/90, 115, 140, 200, and 225 4-stroke models. Suzuki applications include 90-115 4-stroke, 140 4-stroke, 150-225 2-stroke, and 150-250 4-stroke engines. Honda compatibility covers 75-90 HP, 115-130 HP, BF 115 (2011-newer), and BF 135/150/200/225/500 models. Yamaha outboards from 115 4-stroke to 150-300 HP are covered, as are all Yamaha sterndrives. It also fits Nissan/Tohatsu BFT 115/150/200/225/250 models. The Sierra 18-3726 is interchangeable with numerous OEM and aftermarket parts, including Suzuki 09141-18005, Evinrude/Johnson/BRP 5030422, Yamaha 90171-18M04-00, Mallory 9-73909, GLM 21241, and Mercury/Quicksilver 859939. Its construction from bronze provides excellent corrosion resistance in marine environments, ensuring reliable performance and a long service life.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandSIERRAMARINE
Part NumberS08C 18-3726
CategoryTowing Equipment

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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