6.3, Pack Size Small, Minimum Thread Length 1 1/2 in, Type Standard Machine Screw, Washer Outside Diameter Not Applicable, Washer Thickness Not Applicable, Maximum Head Width Not Applicable, Minimum Head Width Not Applicable.322 in, Head Height 0.115 in, Drive Size #2, Tensile Strength 70,000 psi, Dimensional Standards ASME B18.