DIN 127 is the definitive German standard for spring lock washers, featuring a helical split design. Engineered to provide a consistent spring force and frictional resistance, it is primarily used to prevent the loosening of bolted joints caused by vibration or thermal expansion in non-critical assemblies.

Available in Form A (bent ends) and Form B (flat ends), this standard remains one of the most widely utilized anti-loosening components in global mechanical engineering, despite the emergence of modern high-tension locking systems.

The DIN 127 washer operates on the principle of axial spring tension. When compressed, the sharp split ends bite into the bearing surface of the bolt head or nut, significantly increasing friction. This mechanical interference helps counteract the self-loosening tendencies of threaded fasteners under dynamic loads.

• General mechanical engineering and repair
• Automotive sub-assemblies and chassis components
• Electrical appliances and control panel mounting
• Construction of steel frames and temporary structures