BBI® cap screw, partially threaded, measurement system: imperial, 7/16-14 thread, 4-1/2 in L under head, 8 grade, alloy steel, zinc yellow bake CR+6, UNC thread, 9/32 in H head, hex head, 150,000 psi tensile strength, material specification: ASTM B633-FE, ZN5 type 2, 7/16 in shank, 33 to 39 HRC hardness. BBI® 455244 Partially Threaded Cap Screw, 7/16-14, 4-1/2 in L Under Head, 8 Grade, Alloy Steel, Zinc Yellow Bake CR+6