FAG KML28

FAG KML28 Precision Locknut

Description

The FAG KML28 is a high-quality precision locknut, engineered for applications that demand high accuracy and strong axial holding forces. It is used to locate bearings and other components on a shaft, providing a secure and reliable fixture. Its integrated locking mechanism ensures a firm grip without damaging the shaft threads, making it a superior choice for precision machinery.

Specifications

• Brand: FAG
• Model: KML28
• Type: Precision Locknut
• Thread Size: M140x2
• Outside Diameter: 175 mm
• Width: 22 mm
• Material: Steel

Label Info

• Manufacturer: FAG Germany VO
• Part Number: KML28
• EAN: 4012801223157

Application

This locknut is ideally suited for securing bearings in demanding environments such as machine tool spindles, printing machinery, gearboxes, and other equipment where shaft rigidity and positional accuracy are critical.

Country of Origin

Manufactured in Germany.

CO2 Impact

By purchasing this pre-owned component, you contribute to a circular economy and avoid the emission of approximately 1.22 kg of CO2, which is comparable to the emissions saved by driving a car for 6 kilometers.

Availability

This item is in stock and ready for immediate dispatch. Order now from spareparts2day for expert support and fast delivery.

FAQ

What is the correct tightening torque for the FAG KML28 locknut?

The tightening torque is not a fixed value and depends heavily on the specific application, bearing preload requirements, and lubrication used. It is crucial to consult the machine manufacturer’s assembly manual or use FAG’s calculation tools for the correct procedure and torque value to avoid bearing damage.

Does the KML28 require a separate locking device like a tab washer?

No, the FAG KML series features an integrated locking mechanism. The locking is achieved by grub screws (not included with the nut) that press brass pins against the shaft thread, providing a secure, friction-based lock without damaging the shaft.

What is the “B.MF” marking on the nut?

The “B.MF” marking on FAG precision locknuts indicates the location of the highest point of radial run-out of the nut thread. For maximum precision, this mark should be positioned 180 degrees opposite to the highest point of radial run-out of the shaft thread during assembly.

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Last Update: Friday, March 13, 2026