BBI® 455098 Partially Threaded Cap Screw, 5/16-18, 4 in L Under Head, 8 Grade, Alloy Steel, Zinc Yellow Bake CR+6

BBI® cap screw, partially threaded, measurement system: imperial, 5/16-18 thread, 4 in L under head, 8 grade, alloy steel, zinc yellow bake CR+6, UNC thread, 13/64 in H head, hex head, 150,000 psi tensile strength, material specification: ASTM B633-FE, ZN5 type 2, 5/16 in shank, 33 to 39 HRC hardness.