What is the SKF MB 1 lock washer used for?

It is used to secure a compatible lock nut (such as KM 1) on a shaft and prevent unintentional loosening.

Which lock nut is compatible with this lock washer?

This lock washer is designed for use with the SKF KM 1 lock nut.

What are the dimensions of the SKF MB 1?

The lock washer has an inside diameter of 12 mm and an outside diameter of 25 mm.

How does the locking mechanism work?

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

Can you reuse this lock washer after removal?

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

SKF MB 1 lock washer for lock nuts 12 x 25 mm

Supplier number: SKF MB 1 | EAN 7316570872781

1.29 tax incl.

€1.07 excl. VAT (incl. all environmental contributions)

On stock - immediately available | we have 6 products in stock.

Ordered before 20:00 - delivered tomorrow 09/10/2026
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

Reliable locking for metric lock nuts

Practical benefits

Prevents unintentional loosening: With the Skf lock washer, you secure nuts firmly on a shaft or sleeve.
Quick and simple installation: You easily bend one of the outer tabs into a nut slot.
Precise dimensional fit: The 12 mm inside diameter and 25 mm outside diameter ensure accurate placement.

In a nutshell

The right choise for

With the Skf mb 1 lock washer, you secure a reliable and stable mechanical locking solution on shafts or adapter sleeves. Designed for use with the km 1 lock nut, it effectively prevents unintentional loosening caused by rotational forces and dynamic vibrations. Featuring an inside diameter of 12 mm and an outside diameter of 25 mm, it delivers a precise fit on your shaft assembly. The inner tab firmly engages the shaft keyway, allowing you to easily bend one of the outer tabs into a slot on the lock nut to maintain bearing preload and position.

Product information FAQ

€1.29

In stock - tax incl.

Key features according to our expert

Inner diameter: 12 mm
Outer diameter: 25 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: 12 mm
Outer diameter: 25 mm
Outer diameter: 25
Bore diameter: 12
Locking device: Lock washer

Brand SKF
01230626
EAN 7316570872781
Supplier number SKF MB 1

Frequently asked questions about this product

Answered by specialists

What is the SKF MB 1 lock washer used for?: It is used to secure a compatible lock nut (such as KM 1) on a shaft and prevent unintentional loosening.
Which lock nut is compatible with this lock washer?: This lock washer is designed for use with the SKF KM 1 lock nut.
What are the dimensions of the SKF MB 1?: The lock washer has an inside diameter of 12 mm and an outside diameter of 25 mm.
How does the locking mechanism work?: The inner tab engages the shaft keyway, and one outer tab is bent into a slot on the lock nut.
Can you reuse this lock washer after removal?: No, a new lock washer should be installed each time the lock nut is mounted.