M3 - 3mm Pack of 100 - SPRING WASHERS STEEL ZINC PLATED RING SPLIT HELICAL HELIX LOCK WASHER DIN 7980 - By Pentech Moulding Co Ltd A SPRING WASHER (ring split) at one point and bent into a helical shape. This causes the washer to exert a spring force between the fastener's head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to rotation. The benefit of spring lock washers lies in the trapezoidal shape of the washer. When compressed to loads near the proof strength of the bolt, it will twist and flatten. This reduces the spring rate of the bolted joint which allows it to maintain more force under the same vibration levels. This prevents loosening SUITABLE FOR General purpose engineering, automotive panel fixing, building, sheet metal, plastic fabrication M3 - 3mm STEEL BZP ZINC PLATED suitable for 3mm bolt/screw - Pack of 100 Pieces, Manufacturer: BARIDI