The thick, hexagonal head design on these steel cap screws is engineered for tightening with a wrench. - Use in pretapped holes or with nuts. Grade 5 steel construction offers strength and moderate flexibility, allowing the screws to withstand shear force better than Grade 8 screws. Material / Steel, Steel Material Grade/Class / Grade 5 Finish / Zinc Plated Thread Size / 1/4"-20 Thread Direction / Right Hand Fastener Length / 2 in Minimum Thread Length / 3/4 in Head Width / 7/16 in Head Height / 5/32 in Drive / Hex 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 in Thread Fit / 2A Thread Style / Partially Threaded Type / Hex Head Cap Screw Head Style / Hex Thread Pitch / Partially Threaded Thread Type / Coarse