KM 21 Bearing Lock Nut - precision industrial mounting component

Applications in bearing systems and industrial machinery

The KM 21 bearing lock nut is a precision mounting component used for securing bearing units, bearing housings, transmission shafts and rotating assemblies. It is commonly paired with a tab washer (e.g. MB 21) to ensure a reliable connection that resists vibration and loosening during operation.
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The KM 21 nut is widely used in industrial applications, agricultural machines, power transmission systems, conveyors, and mechanical assemblies requiring durability, precision and maximum operational safety.

Key advantages and performance characteristics

• High durability and mechanical strength - steel construction provides exceptional resistance to tightening torque, shock loads and vibration.

• Secure bearing positioning - ensures accurate retention of the bearing unit or housing on the shaft.

• Compatible with MB 21 lock washer - prevents back-rotation of the nut and enhances long-term stability.

• Reliable in demanding industrial environments - suitable for heavy-duty drive systems, automation equipment, transport lines, and rotating machinery.

• Fast installation and service efficiency - ideal for maintenance teams working to reduce downtime and optimize machine performance.

Technical Data

FAQ - Frequently searched questions

1. What is the KM 21 lock nut used for?
It is used to secure bearing units or bearing housings to a shaft, preventing axial movement and loosening caused by rotation or vibration.

2. Can the KM 21 nut be used with a tab washer?
Yes. It is typically paired with the MB 21 tab washer, which locks the nut in place and prevents reverse rotation.

3. How do I choose the correct lock nut?
Select based on shaft diameter, thread type, bearing unit specifications and the recommended tightening torque provided by equipment manufacturers.

4. Where is the KM 21 lock nut typically used?
In conveyors, power transmission systems, agricultural and construction equipment, industrial automation and mechanical assemblies.