Raymond Locknut – RA750-420

Built from steel and sized at about 0.6 inch across, this self-locking nut is cataloged for Raymond and Crown lift truck hardware assemblies. Unlike a standard hex nut, it incorporates a friction element, typically a deformed thread or a nylon insert, that resists loosening from vibration without a separate lock washer or thread-locking compound.

That locking feature wears out with repeated installation and removal, since each reuse reduces the friction the element generates against the bolt threads. Once it is worn, the nut behaves like a standard nut and can back off under vibration, which is why locknuts are generally treated as a one-time-use fastener at critical joints.

The same physical locknut is documented across both Raymond and Crown assemblies, reflecting the shared parts lineage between the two brands, so it serves as a replacement fastener at hardware points on applicable Raymond and Crown lift trucks that used this nut in the original build. Match the thread diameter and pitch to the bolt it threads onto, since the nut must engage the same thread to lock.