Spring Lock Washer Package Content: 100(+/-2%) pcs x Spring Lock Washer Main Color: Black Material: Carbon Steel Weight: 185 g Outer Dia.: 15 mm / 0.6 in Inner Dia.: 5/16 in (0.3125 in) Key benefits - Prevents loosening from vibration by providing spring tension and load distribution - Maintains clamp force under dynamic loads for reliable fastener performance - Simple, dependable locking action without additional parts or tools - Black carbon steel construction offers strong, durable performance Specifications and fit - Product name: Spring Lock Washer - Package content: 100(+/-2%) pieces - Color: Black - Material: Carbon Steel - Weight: 185 g total - Outer diameter: 15 mm (0.6 in) - Inner diameter: 5/16 in (0.3125 in) Compatibility - Designed for standard 5/16 in bolts - Suitable for assemblies where the bolt passes through an inner diameter of 5/16 in and a surrounding surface requires a 15 mm outer washer Use scenarios - Automotive and machinery: securing engine components, brackets, and other high vibration mounts - Outdoor equipment and garden tools: fastening mower, generator, or power tool assemblies that experience movement - Home improvement and furniture: joining frame components or tool storage solutions that are exposed to vibrations Notes - For best results, use with compatible fasteners andEnsure proper torque to maintain locking effectiveness