Manufacturer Part Number: BOWKP80404-2|Washer Type|USSMaterial|SteelMaterial Grade|9Screw Size|1/2 inThread Size|Inside Diameter (Inch)|17/32Inside Diameter (Decimal Inch)|0.5260Inside Diameter (mm)|Outside Diameter (mm)|Outside Diameter (Inch)|1-3/8Outside Diameter (Decimal Inch - 4 Decimals)|1.3750Thickness (mm)|Thickness (Inch)|9/64Thickness (Decimal Inch - 4 Decimals)|0.1340Standards|Finish Coating|Bowma-GuardFastener Standard|ASTM F436Military Specification|System Of Measurement|InchAdditional Information|Product Service Code|UNSPSC Code|31161807