Skip to product information
74040 Marine Propeller Lock Set for Yamaha Honda Suzuki M18 x 1.5 Thread Size
$94.09
Sale price
$94.09
Regular price
Quantity
Pickup currently not available
Secure Checkout • Encrypted Payments
Free Shipping
Contiguous U.S.
1-Year Warranty
Parts you can rely on
30-Day Returns
Hassle-free returns
Need help confirming fitment?
Talk with a parts expert today.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I needed a forklift part and wasn’t sure which one fit. They asked for the model and serial number, got back to me quickly, and made sure I ordered the right one. Really helpful.
Randy W. — Verified customer
Equipment Fitment
Review the equipment and model information below. Fitment can vary by serial number, production date, or machine configuration, so confirm your model and reference numbers before ordering.
Equipment / model
- 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
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)
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.