74040 Marine Propeller Lock Set for Yamaha Honda Suzuki M18 x 1.5 Thread Size

This Marine Propeller Lock Set is a propeller nut locking system compatible with Yamaha, Honda, and Suzuki outboard motors and matches OEM Part# 74040.

Product Overview

The 74040 Marine Propeller Lock Set secures the propeller and nut against loosening and theft on marine outboard engines. Engineered for Yamaha, Honda, and Suzuki lower units, this locking set uses a matched locking tab and retainer to maintain proper torque. The 74040 Marine Propeller Lock Set provides peace of mind for boaters who want reliable propeller retention.

Key Features & Performance

• Threaded M18 x 1.5 design matches common propeller shaft dimensions on Yamaha, Honda, and Suzuki outboards
• Includes locking tab, retainer nut, and necessary hardware to create a positive mechanical lock
• Corrosion-resistant construction withstands saltwater and freshwater marine environments
• Simple installation requiring basic hand tools — no drilling or shaft modification needed
• Prevents propeller nut from backing off under torque, vibration, and reversing thrust
• Deters propeller theft by requiring a specific key or tool for removal (check kit contents)

Fitment & Compatibility

• Yamaha outboard motors with M18 x 1.5 thread propeller shaft
• Honda outboard motors with M18 x 1.5 thread propeller shaft
• Suzuki outboard motors with M18 x 1.5 thread propeller shaft

Common Uses

• Securing propellers on bass boats, runabouts, and offshore fishing rigs
• Replacing missing or damaged locking hardware during propeller changes
• Installing on high-torque outboards where prop slippage is a concern
• Adding theft deterrence when the boat is moored or trailered unattended
• Routine maintenance item during annual lower unit service

Technical Specifications

• Part Number(s): 74040
• Thread Size: M18 x 1.5

Frequently Asked Questions

Q: Does this set require a special tool for installation? A: Installation typically uses the standard propeller wrench and socket; some kits may include a security key for the locking nut, so check included hardware.

Q: Will this lock fit a Yamaha F150 4-stroke outboard? A: Yes, if the propeller shaft has M18 x 1.5 threads. Always verify your specific model year shaft thread size, as some engines may vary.

Product appearance and specifications may vary slightly by batch. Compatibility may vary by serial number. Verify fitment before purchase.