1" Shaft Coupler Nut & Key Kit – 3/4-10 Nyloc Locknut

Metal shaft coupler nut and key kit for 1-inch shafts, including a hex nut and a brass key, used for mechanical connections.
SKU: 0253ZINC0.750-10-Kit

1" Shaft Coupler Nut & Key Kit – 3/4-10 Nyloc Locknut

$23.70

Nut & key used to secure coupler to prop-shaft. Works with all couplers except for the reverse coupler.

In Stock

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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.

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