Manufacturer Part Number: BOWKP80410|Washer Type|USSMaterial|SteelMaterial Grade|9Screw Size|1-1/8 inThread Size|Inside Diameter (Inch)|1-1/4Inside Diameter (Decimal Inch)|1.2500Inside Diameter (mm)|Outside Diameter (mm)|Outside Diameter (Inch)|2-3/4Outside Diameter (Decimal Inch - 4 Decimals)|2.7500Thickness (mm)|Thickness (Inch)|3/16Thickness (Decimal Inch - 4 Decimals)|0.1770Standards|Finish Coating|Bowma-GuardFastener Standard|ASTM F436Military Specification|System Of Measurement|InchAdditional Information|Product Service Code|UNSPSC Code|31161807