BBI Cap Screw, Fully Threaded, Measurement System: Imperial, 1/4-28 Thread, 1/2 in Length Under Head, 8 Grade, Alloy Steel, Plain, UNF Thread, 5/32 in H Head, Hex Head, 150000 psi Tensile Strength, Material Specification: SAE J429, 33 to 39 HRC Hardness