BBI® 455391 Partially Threaded Cap Screw, 9/16-12, 4-1/2 in L Under Head, 8 Grade, Alloy Steel, Zinc Yellow Bake CR+6

BBI® cap screw, partially threaded, measurement system: imperial, 9/16-12 thread, 4-1/2 in L under head, 8 grade, alloy steel, zinc yellow bake CR+6, UNC thread, 23/64 in H head, hex head, 150,000 psi tensile strength, material specification: ASTM b633-fe, zn5 type 2, 9/16 in shank, 33 to 39 HRC hardness.