These Hex Head Cap Screws feature hexagon-shaped heads for tightening and loosening with a socket or wrench. - Grade 8 steel construction offers high tensile strength and high torque capabilities. Material / Steel, Steel Material Grade/Class / Grade 8 Finish / Zinc Yellow Thread Size / 3/8"-16 Thread Direction / Right Hand Fastener Length / 1 in Minimum Thread Length / 1 in Head Width / 9/16 in Head Height / 15/64 in Drive / Hex Drive Size / 9/16 in Tensile Strength / 150,000 psi Rockwell Hardness / HRC33 Dimensional Standards / ASME B18.2.1 Material Quality Standard / SAE J429 System of Measurement / Inch Overall Length / 1 in Thread Fit / 2A Thread Style / Fully Threaded Thread Type / Coarse