Propeller Castle Nut 90171-16011 For Yamaha Outboard Engines 40HP 50HP 55HP 60HP 70HP 90HP Fits 4 Bolt Shafts Replacement Part For Yamaha Marine Motors

Propeller Castle Nut 90171-16011 for 4-Bolt Shafts
✔️ Single nut for Yamaha 4-bolt shafts on 40-HP to 90-HP engines

This castle nut is a replacement nut for Yamaha outboard propellers, securing the propeller to 4-bolt drive shafts. It's a common spare part for Yamaha Marine motors in the 40HP-90HP range.

✅ Part numbers: 90171-16011-00, 90171-16011
✅ Fits Yamaha outboard propeller nut for 4-bolt shafts
✅ Replacement part for Yamaha marine motors across 40HP-90HP
✅ Corrosion-resistant construction suitable for saltwater use

💡 What is a castle nut used for with Yamaha outboard propellers?

The castle nut locks the propeller onto the 4-bolt shaft and uses a cotter pin to prevent loosening during operation. - secure propeller to 4-bolt shaft - anti-loosening with cotter pin and washer - corrosion-resistant design for marine environments