BBI Cap Screw, Fully Threaded, Measurement System: Imperial, 1/4-20 Thread, 1/2 in Length Under Head, 8 Grade, Alloy Steel, Zinc Yellow Bake CR+6, UNC Thread, 5/32 in H Head, Hex Head, 150000 psi Tensile Strength, Material Specification: ASTM B633-Fe, Zn5 Type 2, 33 to 39 HRC Hardness