Manufacturer Part Number: HHCS-516-1.50-N|System Of Measurement|InchThread Size (Inch)|5/16-18Thread Size (mm)|Length Under Head (Inch)|1-1/2Length Under Head (mm)|Material|NylonMaterial Grade|6/6Finish Coating|Bright/UncoatedThread Standard|UNCFull or Partial Threading|Partially ThreadedLength (mm)|Length (Inch)|Head Height (Inch)|Head Height (mm)|Head Height (Decimal Inch)|Standards|ASTM D789-66 Type 1; GDE2Length Measurement Type|Length Under HeadHex Key Size (Decimal Inch)|Hex Key Size (mm)|Hex Key Size (Inch)|Additional Information|Product Service Code|UNSPSC Code|31161501