Manufacturer Part Number: 39729|Washer Type|Duty Type|Screw Size|1/2 inMaterial|Alloy SteelThread Size|Inside Diameter (mm)|Inside Diameter (Decimal Inch)|Outside Diameter (mm)|Outside Diameter (Decimal Inch - 4 Decimals)|Thickness (mm)|Thickness (Decimal Inch - 4 Decimals)|0.1250Hardness|Material Grade|AISI 4037Military Specification|Does Not Meet Military SpecificationsStandards|Minimum Inside Diameter (Decimal Inch)|0.5020Minimum Inside Diameter (mm)|0.50Maximum Inside Diameter (mm)|Minimum Outside Diameter (Decimal Inch)|Minimum Outside Diameter (mm)|Maximum Outside Diameter (mm)|0.86Maximum Outside Diameter (Decimal Inch)|0.8690Maximum Thickness (Decimal Inch)|Maximum Thickness (mm)|Fastener Standard|Maximum Inside Diameter (Inch)|0.5120System Of Measurement|InchFinish Coating|Yellow Zinc DichromateAdditional Information|UNSPSC Code|31161801