The washer is a thin, disk-shaped plate with a central hole, commonly used to distribute the load of a threaded fastener such as a screw or nut. Other applications include use as a spacer, wear pad, preload indicator, locking device, and vibration reducer. High-quality bolted joints often require hardened steel washers to maintain preload after torque application. Washers help prevent galvanic corrosion by insulating dissimilar metals—for example, steel screws from aluminum surfaces. This set consists of flat washers made from high-conductivity copper, offering good electrical and thermal conductivity. Flat washers help distribute load, protect the surface being fastened, and provide electrical insulation between dissimilar metals. They are suitable for applications where the hole diameter exceeds that of the fastening nut. The set includes multiple sizes for versatile use. Material: Copper Color: Copper Type: Flat Washer Dimensions and quantities: M5 × 9 × 1 mm — 30 pcs M6 × 10 × 1 mm — 30 pcs M6 × 12 × 1 mm — 20 pcs M8 × 12 × 1 mm — 30 pcs M10 × 14 × 1 mm — 30 pcs M8 × 14 × 1 mm — 20 pcs M12 × 16 × 1 mm — 25 pcs M14 × 18 × 1 mm — 25 pcs M12 × 18 × 1.5 mm — 20 pcs M16 × 20 × 1.5 mm — 20 pcs M16 × 22 × 1.5 mm — 15 pcs M20 × 26 × 1.5 mm — 15 pcs Package includes: 280 × copper washers 1 × plastic storage box Note: Actual product color may vary slightly due to lighting and screen settings. Dimensional tolerances may vary by ±1–3 mm.