Manufacturer Part Number: 44103|Slot Width|Type|T-Slot BoltSlot Width (Inch)|1/2Slot Width (Decimal Inch)|Head Height (Inch)|5/16Head Height (mm)|Head Width (Inch)|7/8Head Width|Length Under Head (mm)|Length Under Head (Inch)|3Material|SteelMaterial Grade|4140; 8Thread Fit Class|Class 2AFinish|BlackThread Size (Inch)|1/2-13Thread Size (mm)|Thread Standard|UNCThread Length (Inch)|1-1/2Thread Length (mm)|Thread Length (Decimal Inch)|Fastener Standard|System Of Measurement|InchProduct Service Code|UNSPSC Code|