1" Shaft Coupler Nut & Key Kit – 3/4-10 Nyloc Locknut
0253ZINC0.750-10-Kit
Nut & key used to secure coupler to prop-shaft. Works with all couplers except for the reverse coupler.
Keep your drivetrain secure with this 1" shaft coupler nut and key kit from Marine Hardware. Designed for marine and underwater applications, this kit includes a corrosion-resistant hex nylon-insert lock nut (nyloc) and a precision rectangular shaft key to help maintain a tight, reliable connection between your coupler and shaft. The nylon insert resists vibration loosening—ideal for high-load, wet, and high-vibration environments.
- Fits shaft size: 1" shaft
- Nut thread: 3/4-10
- Nut style: Hex nyloc lock nut (nylon-insert)
- Includes: Lock nut + rectangular shaft key (with chamfered end)
- Use case: Securing shaft couplers and keyed shaft assemblies
FAQ
Will this work with a keyed coupler on a 1" shaft?
Yes—this kit is intended for 1" keyed shaft/coupler setups and includes both the key and the retaining nut (3/4-10 thread).
What does the nylon insert do?
The nyloc insert helps prevent the nut from backing off due to vibration, improving safety and reliability.
