Manufacturer Part Number: 31326|Washer Type|Duty Type|Screw Size|5/16 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)|0.0780Hardness|Material Grade|5Military Specification|Does Not Meet Military SpecificationsStandards|Minimum Inside Diameter (Decimal Inch)|0.3140Minimum Inside Diameter (mm)|0.31Maximum Inside Diameter (mm)|Minimum Outside Diameter (Decimal Inch)|Minimum Outside Diameter (mm)|Maximum Outside Diameter (mm)|0.58Maximum Outside Diameter (Decimal Inch)|0.5830Maximum Thickness (Decimal Inch)|Maximum Thickness (mm)|Fastener Standard|Maximum Inside Diameter (Inch)|0.3220System Of Measurement|InchFinish Coating|Zinc-PlatedAdditional Information|UNSPSC Code|