Junker-style Fastener Looseness Test: Procedure and Results

This is a common test apparatus for applying a load transverse to the bolt axis to loosen the fastener and is compliant with German Institute for Standardisation (DIN) 65151. It is called a Junker test apparatus for the developer, Gerhard Junker. The current ISO (International Organization for Standardization) standard is 16130.

Testing apparatus visuals

testing machine

Testing machine

schematic diagram

Schematic diagram

Test results

It was confirmed that the Hardlock Nut prevented looseness in a Junker testing machine.

test results

Video of the test (Japanese)