SKF MB56

SKF MB 56 Lock Washer

Description

The SKF MB 56 is a reliable and widely used lock washer, designed to secure bearing locknuts of the KM series. It is a simple, stable, and effective fastening device that prevents the locknut from loosening under operational vibrations or temperature changes. By bending one of the washer’s tabs into a corresponding slot on the locknut, a secure mechanical lock is created.

Specifications

• Manufacturer: SKF
• Part Number: MB 56
• Product Type: Lock Washer
• Bore Diameter (d1): 280 mm
• Outside Diameter (D): 352 mm
• Width (B): 3.5 mm
• Number of Tabs: 22
• Associated Locknut: KM 56, KML 56
• Material: Steel

Label Info

• Brand: SKF
• Model: MB 56
• EAN: 7316577011794

Application

This lock washer is essential for mounting and securing bearings on shafts or in housings. It is commonly used in various industrial applications, including gearboxes, pumps, conveyors, and other machinery where reliable bearing fixation is critical.

Country of Origin

Made in Sweden.

CO2 Impact

Choosing this repurposed component saves an estimated 0.98 kg of CO2 compared to manufacturing a new one. This choice supports sustainable industrial practices and reduces your environmental footprint.

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 procedure for installing an SKF MB 56 lock washer?

First, slide the washer onto the shaft. Then, tighten the corresponding KM 56 locknut to the required torque. Finally, identify a washer tab that aligns with one of the slots on the locknut’s circumference and bend that tab securely into the slot using a suitable tool. Avoid bending tabs more than once.

Is the MB 56 washer reusable?

It is strongly recommended not to reuse lock washers. The metal tab that is bent into the nut’s slot undergoes work-hardening, which makes it brittle. Bending it back and then reusing it creates a significant risk of the tab breaking off, which would compromise the locking function. Always use a new washer for each installation.

What material is the MB 56 made of, and is it suitable for corrosive environments?

The standard SKF MB 56 lock washer is made from high-quality deep-drawing steel. While robust for general industrial applications, it is not inherently corrosion-resistant. For applications in wet, humid, or chemically aggressive environments, consider using a stainless steel equivalent or applying appropriate protective coatings.

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Last Update: Friday, March 13, 2026