Hex Head Cap Screws feature hexagon-shaped heads for socket or wrench tightening. - Grade 8 steel construction helps provide high tensile strength and high torque capabilities. Material / Steel, Steel Material Grade/Class / Grade 8 Finish / Zinc Yellow Thread Size / 1/4"-20 Thread Direction / Right Hand Fastener Length / 1 in Minimum Thread Length / 1 in Head Width / 7/16 in Head Height / 5/32 in Drive / Hex Drive Size / 7/16 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 Type / Hex Head Cap Screw Head Style / Hex Thread Pitch / Fully Threaded Thread Type / Coarse