Which lock nuts are compatible with this washer?

It is designed for metric lock nuts in series such as KM, KML, and HM .. T in size 30.

How does this lock washer secure the nut?

The inner tab engages the shaft keyway, and you bend one of the outer tabs into a slot on the lock nut.

Can you reuse a lock washer after disassembly?

No, SKF recommends installing a new lock washer every time the lock nut is mounted or replaced.

SKF MB 30 lock washer for lock nuts 150 x 205 mm

Supplier number: SKF MB 30 | EAN 7316577011725

Recommended Retail Price €63.91

31.60 tax incl.

€26.12 excl. VAT (incl. all environmental contributions)

On stock - immediately available | we have 3 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

↓ Documents (1) ✆ Talk to a specialist

Reliable shaft locking with Skf MB 30

Practical benefits

Prevents unintentional loosening: You lock the nut firmly in place by bending a tab into one of the outer slots.
Secure shaft engagement: The internal tab fits directly into the shaft keyway, preventing rotation during high rotational loads.
Precise standard dimensions: With an inside diameter of 150 mm and outside diameter of 205 mm, it fits matching assemblies.

In a nutshell

The right choise for

With the Skf mb 30 lock washer, you reliably secure metric lock nuts on shafts and adapter sleeves. This washer prevents unintentional loosening caused by vibrations and dynamic loads in heavy rotating machinery, industrial gearboxes, and pumps. The internal tab engages precisely into the shaft keyway, after which you simply bend one of the outer tabs into a slot on the lock nut for a dependable mechanical lock. Featuring an inside diameter of 150 mm, an outside diameter of 205 mm, and a thickness of 2 mm, the Skf mb 30 fits size 30 lock nuts across series such as KM, KML, and hm .. T.

Product information FAQ

€31.60

In stock - tax incl.

Key features according to our expert

Inner diameter: 150 mm
Outer diameter: 205 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: 150 mm
Outer diameter: 205 mm
Outer diameter: 205
Bore diameter: 150
Locking device: Lock washer

Brand SKF
01230655
EAN 7316577011725
Supplier number SKF MB 30

Frequently asked questions about this product

Answered by specialists

What are the dimensions of this SKF MB 30 lock washer?: The lock washer has an inside diameter of 150 mm, an outside diameter of 205 mm, and a thickness of 2 mm.
Which lock nuts are compatible with this washer?: It is designed for metric lock nuts in series such as KM, KML, and HM .. T in size 30.
How does this lock washer secure the nut?: The inner tab engages the shaft keyway, and you bend one of the outer tabs into a slot on the lock nut.
Can you reuse a lock washer after disassembly?: No, SKF recommends installing a new lock washer every time the lock nut is mounted or replaced.