Prop Nut Kit – Sierra Marine Engine Parts (18-3781) provides security and tightness by preventing the loosening of propellers due to constant vibrations. Prop Nut Kit – Sierra Marine Engine Parts (18-3781) has a unique design that prevents them from loosening when exposed to vibrations. Highly tight propellers act as a locking mechanism, making it hard to loosen due to using Prop Nut Kit – Sierra Marine Engine Parts (18-3781). Propeller Nuts are for single use only and do not reuse. This product replaces 6H1-W4599-00, 70739047819, 6H1-W4599-00-00, 47-3781, GLM21261, 808282238230, 18-3781D, 9-73991, 92-21261.
Key Features:
- Easy to install
- Ideal for routine maintenance and replacement
- Vibration is reduced
- Durably made material that will last
- Non-corrosive
- Parts and components that can withstand the test of time
- It includes Prop Nut Kit with Nut, Washer, Spacer, and Cotter Pin
- OMC SX Cobra Prop Nut Kit
- It fits OMC SX Cobra
Product Specifications:
- Brand: SeaStar Solutions
- Condition: Brandnew
- SKU: 18-3781
- UPC: 808282238230
- Weight: 0.54 LBS
Prop Nut Kit with Nut, Washer, Spacer and Cotter Pin fitting Yamaha Outboard applications
This product replaces:
- 6H1-W4599-00, 70739047819, 6H1-W4599-00-00, 47-3781, GLM21261, 808282238230, 18-3781D, 9-73991, 92-21261

![Sufix Superior Hi-Vis Yellow Monofilament – 50lb – 275 yds [638-150]](https://www.sailrepairworks.com/wp-content/uploads/2026/10/sufix-superior-hi-vis-yellow-monofilament-50lb-275-yds-638-150.webp)




