Lock Washers for 7/16 SHCS 25pk

Lock washers for 7/16 SHCS are engineered fastening components designed to prevent vibration-induced loosening in high-stress mechanical assemblies. This 25-pack from ALLSTAR PERFORMANCE is ideal for motorsports, industrial maintenance, and precision machinery applications where socket head cap screws must remain secure under continuous motion and thermal cycling. The split-ring design works by applying constant spring pressure against the fastener, effectively eliminating the need for secondary locking methods and reducing assembly downtime.

Each lock washer features a 0.438-inch inner diameter and 0.646-inch outer diameter, with a thickness of 0.15 inches, machined to exacting tolerances for compatibility with standard 7/16-inch socket head cap screws. The steel construction with black oxide coating provides excellent corrosion resistance and a professional appearance while maintaining hardness under load. The split-ring geometry creates a mechanical lock that grips the fastener and surface simultaneously, distributing clamping force evenly and resisting loosening from vibration, thermal expansion, and repeated tightening cycles that plague traditional flat washers.

Technicians and builders working on race engines, industrial pumps, transmission assemblies, and critical structural connections benefit most from this configuration. The 25-piece bulk pack is economical for maintenance shops, production facilities, and serious hobbyists who prioritize reliability. Installation is straightforward—simply place the lock washer between the screw head and surface before tightening; no special tools or technique required. Black oxide finish maintains appearance across both ferrous and non-ferrous mounting surfaces, making this pack versatile for both internal engine work and external mechanical assembly.