Sierra 18-3702 Prop Nut Kit for Mercury Mariner Outboard Motors

The Sierra 18-3702 Prop Nut Kit is a precision-engineered propeller hardware kit designed specifically for Mercury and Mariner outboard engines ranging from 30 to 60 horsepower. This essential maintenance kit ensures secure propeller installation and proper retention on small gearcase applications.

Kit Contents:

• One (1) Propeller Nut (Sierra 18-3704, replaces Mercury 11-69578)
• Two (2) Tab Washers (Sierra 18-3204-9, replaces Mercury 14-76281)

Key Features:

• Direct replacement for Mercury OEM part numbers 11-69578A1, 11-69578T1, and 11-69578Q1
• Manufactured to meet or exceed OEM specifications for reliable performance
• Compatible with most small gearcase Mercury and Mariner outboard engines
• Includes locking tab washers for secure propeller retention

This kit is an essential spare part for boat owners who perform regular propeller maintenance or inspection. The tab washers provide critical safety retention to prevent propeller nut loosening during operation.