What is the SKF MB 38 lock washer used for?

It secures a lock nut on a shaft or adapter sleeve to prevent unintentional loosening.

Which lock nut is compatible with this lock washer?

This lock washer is designed for use with the KM 38 lock nut.

How does this lock washer secure the nut?

The inner tab engages the shaft keyway, and an outer tab is bent into a slot on the lock nut.

Can this lock washer be reused after removal?

No, a new lock washer should be installed each time the lock nut is mounted.

SKF MB 38 lock washer for lock nuts 190 x 252 mm

Supplier number: SKF MB 38 | EAN 7316577011770

Recommended Retail Price €111.47

54.95 tax incl.

€45.41 excl. VAT (incl. all environmental contributions)

On stock - immediately available | we have 2 products in stock.

Ordered before 20:00 - delivered as of 10/10/2026
Shipping costs €11.99 VAT included | Free shipping for orders over a total amount of 125 euros
Delivery by DHL
Delivered from Belgium

↓ Documents (1) ✆ Talk to a specialist

Dependable shaft locking for bearings

Practical benefits

Reliable anti-loosening design: The Skf MB 38 securely locks metric lock nuts in place when you bend a tab into the slot.
Accurate mounting dimensions: Built with a 190 mm bore and 252 mm outer diameter, you achieve an exact fit on shafts.
Robust high-grade steel: The 2.5 mm steel thickness withstands intense vibrations to keep your mechanical assembly stable.

In a nutshell

The right choise for

With the Skf mb 38 lock washer, you reliably secure rolling bearings and lock nuts on shafts or adapter sleeves. It effectively prevents lock nuts from loosening or rotating under severe vibrations and dynamic loads. Featuring an inside diameter of 190 mm and an outside diameter of 252 mm, it fits compatible km 38 lock nuts accurately. Installation provides a dependable positive lock: the inner tab engages the shaft keyway, and an outer tab bends into a slot on the lock nut. The 2.5 mm thick steel construction delivers durable mechanical holding power for demanding machinery maintenance.

Product information FAQ

€54.95

In stock - tax incl.

Key features according to our expert

Inner diameter: 190 mm
Outer diameter: 252 mm

Product description

MB and MBL lock washers are locking devices, used to secure KM, KML and HM .. T lock nuts onto a shaft or adapter sleeve and prevent unintentional loosening. MB .. A is a stronger version of the MB washer. The lock washers engage a keyway in the shaft or adapter sleeve thread. They lock the nut in position when one of the washer tabs is bent into one of the slots in the outside diameter of the lock nut. A new lock washer should be used each time the corresponding lock nut is installed.

Simple, stable and reliable fastening element
Easy to install and remove
Used for KM, KML, and HM .. T lock nuts

Documents

⤓ Technical data sheet PDF

All Features

Inner diameter: 190 mm
Outer diameter: 252 mm
Outer diameter: 252
Bore diameter: 190
Locking device: Lock washer

Brand SKF
01230660
EAN 7316577011770
Supplier number SKF MB 38

Frequently asked questions about this product

Answered by specialists

What is the SKF MB 38 lock washer used for?: It secures a lock nut on a shaft or adapter sleeve to prevent unintentional loosening.
Which lock nut is compatible with this lock washer?: This lock washer is designed for use with the KM 38 lock nut.
What are the dimensions of this lock washer?: It has an inside diameter of 190 mm and an outside diameter of 252 mm.
How does this lock washer secure the nut?: The inner tab engages the shaft keyway, and an outer tab is bent into a slot on the lock nut.
Can this lock washer be reused after removal?: No, a new lock washer should be installed each time the lock nut is mounted.