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Nyloc, Spring & Flat Washers: Comprehensive Nut Locking & Vibration Guide
Why bolted joints vibrate loose and how to prevent it. Comparing standard flat washers, split spring lock washers, and nylon-insert lock nuts (Nyloc).
The Mechanics of Vibration Loosening
Under transverse cyclic shock and vibration (such as automotive suspension or rotating pumps), dynamic slip occurs across the bolt threads, releasing clamping preload. Nyloc Lock Nuts (DIN 985) feature an elastic nylon collar that deforms around the mating bolt thread, generating high radial friction that resists back-off even under zero bolt tension.