Double-layer self-locking washers: Why can they become tighter with vibration?

Aug 07, 2026

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Replace your old washers with wedge-locking washers – and forget about bolt loosening once and for all.

Why Do Traditional Locking Methods Fail?

 
MethodLimitations
Spring WashersProne to failure under high torque and high vibration conditions
Threadlocker AdhesivesDifficult to remove, not heat-resistant, unsuitable for repeated maintenance
Double NutsRequire precise preload during installation, complicated and time-consuming

How Do Wedge-Locking Washers Work?

 

The principle is simple yet highly effective:

  • Two washers form a pair with wedge-shaped cams on the inner faces.
  • When tightened, the cams interlock securely with each other.
  • Under vibration, the two washers slide slightly relative to each other.
  • The wedge effect automatically compensates for preload loss – the more vibration, the tighter they lock.

✅ No reliance on friction
✅ No adhesives required
✅ No impact on installation efficiency

Pure mechanical self-locking – long-term protection against loosening.

How Do They Extend Maintenance Cycles?

 
  • Outstanding performance under high-frequency vibration and dynamic loads
  • One installation, long-term effectiveness – no frequent shutdowns for retightening
  • Significantly reduces labor costs for maintenance
  • No equipment modifications and no bolt replacements – simply replace your existing washers directly

   Important Installation Tips

StepInstruction
Always use as a pair – never use a single washer alone
Wedge cams facing each other; flat serrated faces against the bolt head/nut
Ensure contact surfaces are clean and flat
Tighten to the specified torque – do not over-tighten
Select washers matching the bolt diameter
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