Spring Pad

Spring pad, also called split lock washers, are classic anti-loosening fastener accessories. Their open-ring, helical spring design provides a unique function: elastic anti-loosening, compensating for fastening gaps, and applying preload. Manufactured to ISO 1234 standards, they are made from spring steel (typically 65Mn) and formed into a single piece with excellent elastic deformation capability. When compressed under a nut, the spring washer flattens slightly, its spring tension exerting a continuous upward force against the nut (and downward against the joint), helping fill gaps and resist loosening caused by vibration or thermal cycling. The sharp edges of the split can also scrape away oxidation on metal surfaces, improving electrical contact. Spring washers are a time-tested solution for high-vibration, loosening-prone fastening applications.

Spring pad are widely used in automotive components, machinery, construction machinery, agricultural equipment, motors, and rail transport - sectors where vibration is a constant challenge. In automotive engines and transmissions, they help maintain clamp load under extreme conditions, ensuring operational safety. In industrial machinery such as motors and reducers, they combat operational vibration. Within construction and agricultural machinery, they endure harsh working conditions. In motors and rail applications, they contribute to overall assembly reliability and safety standards. Spring washers remain a widely relied-upon component for dynamic environments.

These washers are made from high-quality 65Mn spring steel, conforming to GB/T 1222 standards. After heat treatment, they achieve a hardness of HRC 42–48 and an elastic recovery rate ≥95%, ensuring long-lasting elasticity. Surface treatments include black oxide (GB/T 15519), zinc plating (ASTM B633), and phosphating, providing 72–120 hours of salt spray resistance for excellent rust and corrosion protection. All spring washers are ISO 9001 certified, with parameters such as split opening and outer diameter tolerances meeting ISO 1234 requirements to ensure stable anti-loosening performance. Customization is available for higher-strength spring steel, special inner/outer diameter combinations, thickened versions, and specialized surface treatments. Supplied in bulk packs of 1,000–2,000 pieces with anti-loosening performance instructions, they facilitate easy selection and use in vibration-prone assemblies.