Manufacturer Part Number: LWHIS1370USA-01|Washer Type|Spring LockDuty Type|Heavy-DutyScrew Size|1-3/8 inMaterial|Spring SteelThread Size|Inside Diameter (mm)|Inside Diameter (Decimal Inch)|1.3790Outside Diameter (mm)|Outside Diameter (Decimal Inch - 4 Decimals)|2.3010Thickness (mm)|Thickness (Decimal Inch - 4 Decimals)|0.4220Hardness|Material Grade|8Military Specification|Does Not Meet Military SpecificationsStandards|DIN 127B; DIN 7980Minimum Inside Diameter (Decimal Inch)|1.3790Minimum Inside Diameter (mm)|1.37Maximum Inside Diameter (mm)|Minimum Outside Diameter (Decimal Inch)|Minimum Outside Diameter (mm)|Maximum Outside Diameter (mm)|2.30Maximum Outside Diameter (Decimal Inch)|2.3010Maximum Thickness (Decimal Inch)|Maximum Thickness (mm)|Fastener Standard|Maximum Inside Diameter (Inch)|1.4080System Of Measurement|InchFinish Coating|ZincAdditional Information|UNSPSC Code|