Manufacturer Part Number: C52000813|Washer Type|Hi-CollarDuty Type|Screw Size|1/2 inMaterial|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)|0.1720Hardness|Material Grade|18-8Military Specification|Does Not Meet Military SpecificationsStandards|Minimum Inside Diameter (Decimal Inch)|0.5060Minimum Inside Diameter (mm)|0.50Maximum Inside Diameter (mm)|Minimum Outside Diameter (Decimal Inch)|Minimum Outside Diameter (mm)|Maximum Outside Diameter (mm)|0.73Maximum Outside Diameter (Decimal Inch)|0.7370Maximum Thickness (Decimal Inch)|Maximum Thickness (mm)|Fastener Standard|Maximum Inside Diameter (Inch)|0.5180System Of Measurement|InchFinish Coating|UncoatedAdditional Information|UNSPSC Code|