本标准涵盖了完整的通用和尺寸标准 各种类型六角套筒帽的数据 螺钉、带肩螺钉、固定螺钉和六角键 被公认为美国国家标准。而且 其中包括附录，其中提供了 六角套筒量规和量规，显示适用性的表格 各种内六角螺钉类型的钥匙和钻头 以及内六角头的尺寸、钻孔和沉头孔尺寸 有头螺钉，以及用于尺寸数据的公式。 但是，如果出现有关验收的问题 对于产品，应以表中的尺寸为准 按公式重新计算过多。用于焊接的凹槽尺寸 强制性附录III中给出了VI型凹槽。

This Standard covers complete general and dimensional data for various types of hexagon socket cap screws, shoulder screws, set screws, and hexagon keys recognized as an American National Standard. Also included are appendices that provide specifications for hexagon socket gages and gaging, tables showing applicability of keys and bits to various socket screw types and sizes, drill and counterbore sizes for socket head cap screws, and formulas used for dimensional data. However, where questions arise concerning acceptance of product, the dimensions in the tables shall govern over recalculation by formula. Recess dimensions for Type VI recesses are given in Mandatory Appendix III.