What is the SKF KM 40 lock nut used for?

It is used to reliably locate and secure bearings or drive components axially onto a shaft.

What are the thread size and dimensions of this lock nut?

It features an M200 x 3 metric thread, an outside diameter of 250 mm, and a width of 29 mm.

How do you lock this nut onto the shaft?

You lock it into place using a compatible lock washer, such as the MB 40 or MB 40 A.

Is the lock nut reusable?

Yes, provided it is not damaged, the nut can be reused with a new lock washer.

Which tool is required for tightening?

Tighten or loosen the nut via its circumference slots using a spanner such as the SKF TMFN 30-40.

SKF KM 40 locknut 200 x 250 x 29 mm M200x3

Supplier number: SKF KM 40 | EAN 7316577011350

Recommended Retail Price €646.54

319.95 tax incl.

€264.42 excl. VAT (incl. all environmental contributions)

On stock - immediately available | we have 3 products in stock.

Ordered before 20:00 - delivered tomorrow 10/10/2026
Free shipping
Delivery by DHL
Delivered from Belgium

↓ Documents (1) ✆ Talk to a specialist

Secure bearing mounting with Skf KM 40

Practical benefits

Accurate location on shafts: You position bearings and mechanical components securely on shafts with M200X3 metric threads.
Positive locking against vibration: When paired with a matching lock washer, you prevent unintentional loosening during demanding operations.
Easy and controlled tightening: With four equally spaced slots around the circumference, you engage spanners easily for fast installation.

In a nutshell

The right choise for

With the Skf km 40 lock nut, you reliably locate and secure bearings and drive components onto shafts with M200X3 metric threading. Featuring an outside diameter of 250 mm and a width of 29 mm, this nut provides stable axial positioning for demanding industrial machinery. When paired with a compatible lock washer, it positively prevents unintentional loosening caused by heavy operational vibrations. Four evenly spaced slots around the circumference allow for fast, controlled tightening with an appropriate hook spanner. Provided the threads remain undamaged, you can easily reuse the nut during maintenance with a new lock washer.

Product information FAQ

€319.95

In stock - tax incl.

Key features according to our expert

Outer diameter: 250 mm
Width: 29 mm
Thread designation: M200 x 3

Product description

KM and KML lock nuts are used to locate bearings onto a shaft. They have metric threads and four equally spaced slots located around their circumference to accommodate a spanner. They should be locked by a lock washer to prevent unintentional loosening. KM and KML lock nuts can be reused, provided they are not damaged.

Simple, stable and reliable fastening element
Easy to install and remove
Reusable with a new lock washer
Available for thread M 10x0.75 to M 200x3 (sizes 0 to 40)

Documents

⤓ Technical data sheet PDF

All Features

Outer diameter: 250 mm
Width: 29 mm
Thread designation: M200 x 3
Outer diameter: 250
Bore diameter: 200
Associated mounting tool: TMFN 30-40
Nut for hydraulic mounting: No
Locking device: Lock washer

Brand SKF
01230624
EAN 7316577011350
Supplier number SKF KM 40

Frequently asked questions about this product

Answered by specialists

What is the SKF KM 40 lock nut used for?: It is used to reliably locate and secure bearings or drive components axially onto a shaft.
What are the thread size and dimensions of this lock nut?: It features an M200 x 3 metric thread, an outside diameter of 250 mm, and a width of 29 mm.
How do you lock this nut onto the shaft?: You lock it into place using a compatible lock washer, such as the MB 40 or MB 40 A.
Is the lock nut reusable?: Yes, provided it is not damaged, the nut can be reused with a new lock washer.
Which tool is required for tightening?: Tighten or loosen the nut via its circumference slots using a spanner such as the SKF TMFN 30-40.