Loctite
Mechanics of a threaded fastener PART-2

What leads to the failure of threaded fasteners?

Fasteners loosen under vibration, when

Vibrational Stress Imposed < Friction

This happens because of the ‘wedge design’ of threaded assemblies.

Tightening – Nut moves up the wedge

Clamp Load

Loosening – Nut moves down the wedge

Clamp Load

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