I.1. 1 This Standard contains complete general anddimensional data for metric series hexagon sockethead cap screws in sizes from 1.6 mm to 48 mm and formetric series spline socket head cap screws in sizesfrom 1.6 mm to 8 mm recognized as American NationalStandard, Also included are appendices coveringdrill and counterbore sizes (Appendix I), drilledhead dimensions (Appendix II), formulas for dimensions(Appendix III), IS0 dimensional variations (AppendixIV), part numbering system and preferred sizesfor government use (Appendix V), and thread dimensions(Appendix VI).1.1.2 The inclusion of dimensional data in thisStandard is not intended to imply that all of the productsdescribed are stock production sizes. Consumersshould consult with manufacturers concerning lists ofstock production sizes.