Hex head cap screw, head Type: hex, material 18-8 stainless steel, treatment: nl-19(r)(r) thread size 16, thread Type: Coarse, thread style fully threaded, thread direction: right hand, Length under head 3-1/2", thread Length 3-1/2", head height: 15/64", head width: 9/16", Rockwell hardness B80 to C32, tensile strength 85,000 to 150,000 psi meets/exceeds ASTM F593 and ASME B18.2.1 dia./thread size 3/8-16