A lock washer is a mechanical component designed to secure fasteners in place. It is primarily constructed from stainless steel, though alternative materials like aluminum or bronze may be used.

Lock washers function by generating pressure that prevents nuts and bolts from rotating, shifting, or becoming loose under vibrational forces or torque loads. When installed correctly, lock washers serve as an economical and straightforward solution for maintaining threaded fasteners securely in position over extended periods.