Lock Washer Lock Washer Type Internal Tooth Lock Finish Plain Material Phosphor Bronze Inside Diameter 0.256 in Outside Diameter 0.46 in Maximum Thickness 0.023 in Color Bronze Dimensional Standards ASME B18.21.1 For Use With Large Round Pan or Binding Head Screws Material Grade/Class Not Graded Pack Size Small Pack Rockwell Hardness B90 System of Measurement Inch Thickness Tolerance 0.023 in to 0.028 in Package Quantity 100