PROPELLER NUT KIT

Secure your Yamaha outboard propeller with this reliable propeller nut kit from AMMA Marine (Sierra 18-73990). Designed for optimal performance and straightforward installation, this kit is built to endure harsh marine conditions and provide long-lasting durability.

The complete kit includes everything needed for secure propeller attachment: one Sierra 18-2380 cotter pin, one Sierra 18-3732 propeller nut, and one Yamaha 663-45987-02-00 thrust washer.

This kit is compatible with Yamaha outboard models such as 40 HP (1984-2001), 50 HP (1984-1995), C55 HP, and F40-F50 HP (1995-2000). It is also interchangeable with Mallory 9-73990, Yamaha 6H4-W4599-00-00, and 6H4-WPROP-00-KT. AMMA Marine products are crafted for the pleasure boat market, ensuring years of dependable use.

• Precision-engineered for exact OEM fit and vibration resistance
• Constructed from corrosion-resistant materials for reliable saltwater performance
• Includes all necessary components for secure propeller installation
• Supported by an industry-leading warranty with easy over-the-counter exchange at authorized retailers