Are Locknuts reusable? Most locknuts can be reused several times. But the majority of locknuts are Prevailing Type which degrade from multiple usages. The prevailing torque will lessen over many usages reducing the ability for the nut to grip the bolt. However, HARLDOCK does not have prevailing torque and grips onto the bolt after being seated. The HARDLOCK Nut does not degrade/ plastically deform like Prevailing Type Locknuts do.In order to prove that HARDLOCK Nut can be reused we have used the same HARDLOCK nut over 50 repeated Vibration tests (Junker test). Resultingly we find that there is no change in the remaining preload for the first and last vibration tests.
HARDLOCK Nut → M12 Class 4, Zinc plated (Trivalent Chromate Coating)
Hexagon bolt → M12 × 70 mm, Class 4.8, Zinc plated