SKF KM4 Bearing Lock Nut

Description

The SKF KM4 is a precision-engineered lock nut, also known as a shaft or bearing nut. It is designed to locate bearings and other components on a shaft, as well as to facilitate mounting and dismounting of bearings on tapered journals and adapter sleeves. This component is manufactured to high standards, ensuring reliable performance and durability in demanding industrial environments.

Specifications

• Manufacturer: SKF
• Type: KM4
• Thread Size: M20x1
• Outside Diameter: 32 mm
• Width: 5 mm
• Material: Steel
• Compatible Lock Washer: MB4
• Standard Compliance: DIN 981

Label Info

• Brand: SKF
• Model: KM4
• Origin: Sweden
• Additional Markings: 185P

Application

This lock nut is widely used in various machinery, including gearboxes, pumps, conveyors, and automotive applications, where secure and precise positioning of bearings on a shaft is critical for operational efficiency and longevity.

Country of Origin

This SKF KM4 lock nut is proudly manufactured in Sweden, ensuring high-quality materials and production standards.

CO2 Impact

By choosing this pre-owned component, you are contributing to a circular economy and helping to avoid approximately 0.04 kg of CO2 emissions associated with the production of a new part.

Availability

This item is in stock and ready for immediate dispatch. Order now from PLC2Day for expert support and fast delivery.

FAQ

The KM4 lock nut should be tightened using a hook spanner (e.g., SKF HN 4). Tighten to the manufacturer's recommended torque for the specific application to ensure proper bearing preload, then secure it by bending one of the tabs of the corresponding MB4 lock washer into a slot on the nut.

The SKF KM4 lock nut is designed to be used with an SKF MB4 locking washer. The washer has an inner tab that locates in a keyway on the shaft and an outer tab that is bent into one of the four slots of the nut to prevent it from loosening.

While the nut itself can often be reused if the threads are in good condition, the associated locking washer (MB4) is a single-use item. A new locking washer should always be used each time the nut is installed to ensure a reliable locking function.

PLC2DAY is not an authorized distributor, reseller or representative of the products featured on this website. All product names, trademarks, brands and logos used on this site are the property of their respective owners.

Last Update: Friday, March 13, 2026