Features With Grade 5 steel construction, these hex head cap screws offer strength and moderate flexibility. The thick, hexagonal head design is engineered for tightening with a wrench. Use in pretapped holes or with nuts. Grade 5 steel is hardened, yet more malleable than Grade 8, allowing the screws to withstand shear force. Material / Steel, Steel Material Grade/Class / Grade 5 Finish / Zinc Plated Thread Size / 5/8"-11 Thread Direction / Right Hand Fastener Length / 2 1/2 in Minimum Thread Length / 1 1/2 in Head Width / 15/16 in Head Height / 25/64 in Drive / Hex Drive Size / 15/16 in Tensile Strength / 105,000 psi Rockwell Hardness / HRC19 Dimensional Standards / ASME B18.2.1 Material Quality Standard / SAE J429 System of Measurement / Inch Overall Length / 2 1/2 in Thread Fit / 2A Thread Style / Partially Threaded Type / Hex Head Cap Screw Head Style / Hex Thread Pitch / Partially Threaded Thread Type / Coarse