BBI® 455360 Partially Threaded Cap Screw, 1/2-20, 4-1/2 in L Under Head, 8 Grade, Alloy Steel, Zinc Yellow Bake CR+6

BBI® cap screw, partially threaded, measurement system: imperial, 1/2-20 thread, 4-1/2 in L under head, 8 grade, alloy steel, zinc yellow bake CR+6, UNF thread, 5/16 in H head, hex head, 150,000 psi tensile strength, material specification: ASTM B633-FE, ZN5 type 2, 1/2 in shank, 33 to 39 HRC hardness.