Manganese Steel Locking Washers Kit

This 280-piece locking washer kit is made from manganese steel for enhanced durability and resistance to deformation under load. Dimensions per size: M3 × 9 mm, M4 × 12 mm, M5 × 12 mm, M6 × 14 mm, M8 × 18 mm, M10 × 20 mm, and M12 × 25 mm. Total weight approximately 320 g (estimated based on steel density and quantities). The washers feature a black oxide finish for corrosion resistance and visual consistency. Supplied in a compact, stackable plastic storage box measuring 9.5 × 17 × 2.2 cm — designed for workshop or toolbox organisation. To install, place the washer between the fastener head and the work surface, ensuring the serrated or spring-loaded profile engages securely with both surfaces to inhibit rotational loosening.