Mechanical Maintenance: Used with M8 and M12 Hex Nuts to secure motor mounts and heavy-duty frames. Pneumatic Systems: Acts as a vibration dampener between air cylinders and their Supporting Spots. Hydraulic Fittings: Copper or Bonded (Dowty) Washers are used to create high-pressure fluid seals in pump manifolds. Electrical Engineering: Star or serrated washers are used to penetrate surface coatings for reliable electrical grounding. Automotive Repair: Essential for spreading loads on suspension bolts and engine head fasteners.