1. Expand the contact surface and reduce the stress concentration of the fastening force on the fastener to prevent damage to the fastener.
2. Do not scratch the fastener when tightening the nut.
Because of the above performance of the square washer, it can effectively prevent the leakage and water seepage of the building structure, play the role of shock absorption and buffering, and also has a good tightening and sealing effect.
