The Experts: Can Nord-Lock be used on inclined contact surfaces?

Q: Normally a mating surface is flat but sometimes it can be slightly inclined. What is the maximal angle of surface inclination where the Nord-Lock wedge-locking system can still work successfully?

A: In order to ensure that the bolted assembly is safely secured by Nord-Lock washers, the incline of the mating surface should not exceed 2.5°. It’s important to remember that tightening a bolt on an inclined surface introduces bending and increases the equivalent stress in the fastener. It may therefore yield at a lower preload than expected.

Due to the uneven load distribution when tightening against an inclined surface, the thread jams will increase friction and reduce clamp load as a result. This means that the full capacity of the bolt cannot be utilised no matter what locking system is being used.

ASK THE EXPERTS
Do you have a question about bolt securing?
Put the Nord-Lock experts to the test.
Email your questions about bolt securing to 
experts@nord-lock.com

Do you have any questions?

Contact us directly!

Get in touch with us

To read more on how we handle your contact details please see our Privacy Policy

Thank you for contacting us!