FAG KM12

FAG KM12 Lock Nut for Bearing Mounting

Description

The FAG KM12 is a metric lock nut, also known as a shaft nut or bearing nut, designed for securing bearings onto a shaft. It features four slots on its outer circumference for use with a hook or impact spanner. This precision component prevents the axial loosening of bearings and other machine parts, ensuring operational safety and reliability. It is designed to be used with an MB12 lock washer for secure fastening.

Specifications

• Manufacturer: FAG
• Model: KM12
• Thread Size: M60x2
• Outside Diameter (d2): 80 mm
• Width (b): 11 mm
• Material: Steel
• Compatible Lock Washer: MB12

Label Info

• Brand: FAG
• Part Number: KM12
• EAN: 4012801174336

Application

This lock nut is widely used in mechanical engineering and power transmission applications, including gearboxes, electric motors, pumps, and conveyor systems, to securely locate bearings on a shaft.

Country of Origin

This product is made in Taiwan.

CO2 Impact

Choosing this surplus component over a new one prevents the emission of approximately 0.32 kg of CO2, which is comparable to the savings from driving a standard car for 1.6 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 procedure for a KM12 lock nut?

The KM12 should be tightened using a designated hook spanner (C-spanner) to the manufacturer’s recommended torque. Once tightened, a tab on the corresponding MB12 lock washer is bent into one of the four slots on the nut to prevent it from loosening.

Is the FAG KM12 interchangeable with an SKF KM 12?

Yes, FAG and SKF lock nuts with the same designation (e.g., KM12) are manufactured to the same ISO 2982-2 standards. They are dimensionally identical and fully interchangeable in most applications.

Can this lock nut and its washer be reused?

While the nut itself can sometimes be reused if it’s in good condition, it is strongly recommended to always use a new lock washer (MB12) for each installation. The washer’s locking tab is designed for a single use to ensure a secure connection.

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Last Update: Friday, March 13, 2026