Your result
Locking ability |
2,5 out of 5 |
Reusability |
1 out of 5 |
Worker safety |
4 out of 5 |
Initial cost |
Medium |
Lifetime cost |
Medium |
Locking ability |
2,5 out of 5 |
Reusability |
1 out of 5 |
Worker safety |
4 out of 5 |
Initial cost |
Medium |
Lifetime cost |
Medium |
Locking nuts work to secure bolted joints by adding friction to the thread of the bolt. Different varieties of locking nut exist, those that utilize metal to create friction, such as the all metal nut, and those that incorporate a polymer in the design, such as the nylon insert nut. Locking nuts follow the same installation procedure as normal nuts. The nylon insert nut features an internal nylon washer or patch.
The addition of the non-metal component means that the nylon insert nut is more temperature and chemical sensitive. It also necessitates the use of a tool for installation, however, the revolution speed must be less than 150 RPM in order to avoid over heating the nylon insert.
Read the full version in the eBook "Why do bolts loosen?"
(A comparison between common bolt securing options)
Scroll down to access the ebook.
The biggest challenge for a bolted joint, causing it to lose preload and fail, is spontaneous loosening often caused by vibrations. This Junker test shows all 5 nuts rotated loose! A steep decline in the graph indicates a failure. Read more about the Junker Test.