Features Split lock washers apply greater bolt tension per unit of applied torque to help prevent rotation and loosening. Type / Standard Material / Carbon Steel Finish / Zinc Fits Bolt Sizes / 1/4 in Inside Dia. / 0.26 in Outside Dia. / 0.487 in Thickness / 0.062 in Rockwell Hardness / C38 to C46 Application / Helps Prevent Loosening For Use With / Bolts and Nuts Meets/Exceeds / ASME B18.21.1 Package Quantity / 100