Hobson technical document
Junker Vibration Test Principle (DIN 65151) for Bolted Joints
A one-page Nord-Lock sheet, distributed by Hobson, explaining the Junker vibration test. It shows the test rig used to compare how well different locking methods hold a bolted joint tight under vibration.
What this covers
- Test principle
- Test rig diagram
- Test settings
Applies to Flat Washer, Mudguard / Penny Washer and Safety / Vibration-Lock Washer.
Key things to remember
The essentials from this document in plain words. Check the full document before you rely on a figure.
- The Junker vibration test to DIN 65151 is used to test and compare the security of bolted joints.
- The joint is moved sideways (transverse movement) while a load cell continuously measures the bolt tension.
- The rig shown uses an M8 bolt with a 25mm clamp length, an amplitude of plus or minus 0.3mm and a frequency of 40Hz.
Who it helps: Engineers comparing locking washers and nuts for joints exposed to vibration.
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This document is published by Hobson Engineering, who supply this range to us. We show it here in full so you can read it next to the product; the summary above is ours. Read it on this page or download the PDF. For the most current version, ask us.
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