M3-0.5X12 ISO7045 Phil Pan 410SS Conical Square Washer Sems Full Thread 18 8Stainless Steel (Pack Qty 2,000) BC-MI312CPP188

The conical washer Sems offers a controlled tension with minimal torque while providing a higher retained clamp load than possible with other styles of lockwashers. The Sems can withstand a high tension load and still have the conical washer maintain its spring action. This style of Sems is preferred when fastening more fragile materials since its load is spread to the outermost diameter of the lockwasher. Screw: C1008 or equivalent carbon steel. Conical Lockwasher: C1050 - 1065 or equivalent steel. Screw: Stainless, Class 302 Stainless. Conical Lockwasher: Stainless, 410 Stainless