Threaded Rod

Lock Washer, Lock Washer Type External Tooth Lock, Finish Zinc Plated, Material Steel, For Screw Size 5/16 in, Inside Diameter 0.332 in, Outside Diameter 0.61 in, Maximum Thickness 0.034 in, Dimensional Standards ASME B18.21.1, For Use With Bolts and Nuts, Material Grade/Class Not Graded, Pack Size Small Pack, Rockwell Hardness C40 to C50, System of Measurement Inch, Package Quantity 100 Use Type A External Tooth Lock Washers with round head, pan head, and binding head screws, or similar fasteners whose heads are large enough to make contact with the washer teeth, to help minimize fastener loosening.