SKF
Lock Nuts with Integral Locking
Lock nuts with integral locking incorporate locking elements — typically grub screws or pins — directly into the nut body, eliminating the need for a separate lock washer and shaft keyway. SKF’s KMFE and KMLF series feature set screws with brass or steel noses that seat against the shaft thread, securing the nut. This is particularly beneficial where a keyway is difficult to machine or would weaken the shaft, or where frequent adjustment is required. These nuts are designed to withstand high vibration and are simple to install with an Allen key or spanner. The locking mechanism can be loosened and re-tightened multiple times without loss of function, making them ideal for machinery with periodic bearing adjustments.
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No Shaft Keyway Required
Saves machining cost and avoids stress concentrations.
Vibration-Resistant Locking
Set screws positively clamp threads.
Easy Assembly and Adjustment
Fasten with standard tools; release and retighten as needed.
Compact Design
No separate washer reduces parts count and assembly errors.
Durable Locking Elements
Brass or steel noses protect shaft thread.
Multiple Re-Tightening Cycles
Suitable for applications with regular preloadchecks.
When to Use Integral Locking Lock Nuts
In vibrating screens or crushers, keyed washers can fatigue and break. Integral locking nuts maintain clamping under severe dynamic loads. On shafts where a keyway would raise stress and lead to fatigue cracks, these nuts provide secure retention without material weakening.
Installation Torque for KMFE Lock Nuts
After tightening the nut to the required position, torque the set screws to the SKF-recommended value. This applies a radial clamping force that locks the nut threads. Evenly torque all screws to prevent thread distortion. Recheck after initial operation.