BBI® Cap Screw, Partially Threaded, series: 454, Imperial, 1/4-20, 1-3/4 in Length Under Head, 8 Grade, Alloy Steel, Zinc Yellow Bake Cr+3, UNC Thread, 5/32 in H Head, Hex Head, 3/4 in Minimum Thread Length, 1/4 in Shank. BBI® 454016 Partially Threaded Cap Screw, 1/4-20, 1-3/4 in L Under Head, 8 Grade, Alloy Steel, Zinc Yellow Brake CR+3