50 CNC machined pure copper countersunk washers for flat head screws, M4 industrial supplies

Features:1.These screw washers have standard concentricity, a smooth outer surface, and are concentric.
2.This screw washer is precisely fitted, and the outer surface of the bolt bearing is large, providing a more secure lock.
3.The countersunk screw seal is made of pure copper, which is resistant to corrosion, moisture, and oxidation.
4.These screw washers are small, lightweight, and easy to install and use.
5.Can be installed on many different types of materials. Wide range of applications.
Specifications:Item type: Countersunk screw washer
Material: Pure copper
Model Inner diameter approx.Outer diameter approx.Thickness approx.Counterbore angle Single weight approx.
M3 3.1 mm / 0.1 in 7.9 mm / 0.3 in 2.05 mm / 0.1 in 90° 0.52 g / 0.02 oz
M4 4.1 mm / 0.2 in 9.9 mm / 0.4 in 2.5 mm / 0.1 in 90° 0.88 g / 0.03 oz for M5 5.1 mm / 0.2 in 11.9 mm / 0.5 in 3.2 mm / 0.1 in 90° 1.63 g / 0.06 oz
M6 6.1 mm / 0.2 in 13.9 mm / 0.5 in 3.5 mm / 0.1 in 90° 2.35 g / 0.08 oz

List of Package: 50 x seals