FAG MB20 Lock Washer for KM20 Bearing Lock Nuts

Tab Lock Washer for Securing KM20 Bearing Lock Nuts

The FAG MB20 is a precision tab lock washer designed for use with KM20 bearing lock nuts. It is engineered to mechanically prevent the lock nut from loosening under vibration, dynamic loads and normal machine operation. During installation, the inner tab engages with the shaft keyway while one of the outer tabs is bent into the corresponding slot of the KM20 lock nut, creating a secure mechanical locking system. This proven locking method is widely used in bearing assemblies, industrial machinery and power transmission equipment.

Technical Specifications

Product Description

The FAG MB20 lock washer is an essential component used to secure KM20 bearing lock nuts mounted on threaded shafts. It provides a proven mechanical locking solution without the need for thread-locking compounds, adhesives or additional locking devices.

During assembly, the inner tab locates in the shaft keyway, preventing washer rotation. After the KM20 lock nut has been tightened to the specified torque, one of the outer tabs is bent into the corresponding slot of the lock nut, effectively preventing unintended loosening during operation.

The MB series lock washers are commonly used with self-aligning ball bearings, spherical roller bearings, cylindrical roller bearings and other bearing arrangements mounted directly on threaded shafts, adapter sleeves or withdrawal sleeves.

Key Features

• Original FAG (Schaeffler) component
• Designed for KM20 bearing lock nuts
• Reliable mechanical locking system
• Prevents lock nut rotation
• Manufactured from steel
• Easy installation and removal
• Resistant to vibration-induced loosening
• Compatible with threaded shaft assemblies
• Suitable for bearing mounting applications
• Long service life
• Ideal for OEM and MRO applications

Typical Applications

The FAG MB20 lock washer is commonly used in:

• Bearing assemblies
• Bearing housings
• Adapter sleeve assemblies
• Withdrawal sleeve assemblies
• Gearboxes
• Electric motors
• Pumps
• Fans
• Conveyor systems
• Industrial machinery
• Mining equipment
• Heavy machinery
• Agricultural machinery
• OEM manufacturing
• Maintenance and repair (MRO)

The washer should always be used together with the corresponding KM20 bearing lock nut in accordance with the bearing manufacturer's installation recommendations.

Why Use an MB Lock Washer?

MB lock washers provide a simple, reliable and proven method of securing bearing lock nuts against loosening. Unlike thread-locking compounds, they allow quick disassembly during maintenance while maintaining dependable locking performance under vibration, alternating loads and continuous machine operation.

FAQ

Which lock nut is compatible with the FAG MB20?

The FAG MB20 is specifically designed for use with the KM20 bearing lock nut.

What are the dimensions of the MB20 lock washer?

The washer has an inside diameter of 100 mm, an outside diameter of 142 mm, a working diameter of 120 mm, and a thickness of 1.75 mm.

What material is the MB20 manufactured from?

The washer is manufactured from durable steel designed for bearing locking applications.

How does the MB20 locking system work?

The inner tab fits into the shaft keyway while one of the outer tabs is bent into a slot of the KM20 lock nut, preventing the nut from rotating during operation.

Where is the FAG MB20 commonly used?

It is widely used in bearing assemblies, industrial gearboxes, electric motors, pumps, conveyors, agricultural machinery, mining equipment and many other industrial power transmission applications.

Can an MB20 lock washer be reused after removal?

The washer should always be inspected before reuse. If the locking tabs are excessively bent, damaged or show signs of fatigue, replacement is recommended to ensure reliable locking performance.