Double Fold Self-Locking Washer

Description

– A Double Fold Self-Locking Washer, like the DIN 25201 type, is a specialized fastener designed to prevent loosening of bolted connections due to vibration and dynamic loads.
– It achieves this through a wedge-locking mechanism, using two washers with cam surfaces that interlock upon tightening, creating tension that resists loosening.
– These washers are typically used in pairs, with the cam faces facing each other, and are effective even with varying pre-load conditions and lubrication.

Key Features:
Wedge-Locking Mechanism:
The core of the design is the cam profile on the washers. When tightened, these cams interlock, creating a wedge effect that resists loosening due to vibration or dynamic loads.
Dual Washers:
Double fold washers consist of two identical washers that are assembled with their cam surfaces facing each other.
Radial Teeth:
In addition to the cam surfaces, many designs include radial teeth on the opposite side of the washers, which grip the mating surfaces and further enhance the locking action.
Tension vs. Friction:
Unlike some locking methods that rely on friction, double fold washers primarily use tension created by the wedge-locking action to secure the connection.
Self-Locking:
The washers are designed to lock automatically when tightened, providing a reliable and consistent locking performance without requiring additional tools or adhesives.