Package Contents: You will receive 50 pieces M4 black nylon plastic washers. These M4 nylon washers have an inner diameter of approximately 4 mm, an outer diameter of approximately 12 mm, and a thickness of approximately 1 mm. We also offer spacers of various specifications, to be selected according to the screw size. Quality Materials: M4 plastic spacers are made of nylon, a lightweight material with good insulating properties. It also offers excellent wear and corrosion resistance. Even in oily, weakly acidic, or weakly alkaline environments, nylon door hinge washers remain stable and do not easily deform or break after prolonged use. Shock Absorbing: M4 nylon washers effectively increase the contact surface of the connector and prevent its surface from crushing and deformation. They also absorb vibrations and mechanical shocks between components and reduce direct friction and operating noise between metal components. Effective Insulation: The insulating properties of M4 nylon plastic washers help block conductive contact between metal parts, effectively preventing short circuits and electromagnetic interference in equipment. Under pressure, M4 nylon flat washers deform elastically, adapting perfectly to the gap between the sealing surfaces and thus blocking gas or liquid leaks. Wide Application: Nylon washers are suitable for motors, pumps, valves, transmission systems, and other applications requiring cushioning, as well as mechanical equipment, automotive parts, bearing seats, gearboxes, etc., to provide insulation and prevent loosening. They can also be used in switches and furniture connectors.