Manufacturer Part Number: MPKP44022|System Of Measurement|InchThread Size (Inch)|5/16-18Thread Size (mm)|Length Under Head (Inch)|1-1/4Length Under Head (mm)|Material|SteelMaterial Grade|Grade 8Finish Coating|Zinc-PlatedThread Standard|UNCFull or Partial Threading|Fully ThreadedLength (mm)|Length (Inch)|Head Height (Inch)|Head Height (mm)|Head Height (Decimal Inch)|Standards|ASTM A354 BDLength Measurement Type|Length Under HeadHex Key Size (Decimal Inch)|Hex Key Size (mm)|Hex Key Size (Inch)|Additional Information|Product Service Code|UNSPSC Code|