本标准涵盖一般数据和尺寸数据 与各种类型的螺钉和系留件相关 垫圈组件，也称为SEMS。半导体激光器 产品可能包括螺钉、自攻螺钉或螺栓 不同等级直径0至1/2英寸 和材料。单词SEMS在 美国作为适用于螺钉和 垫圈组件。本标准还包括 非强制性附录A说明了 平垫圈和锥形垫圈SEMS的比例。

This Standard covers general and dimensional data pertinent to the various types of screw and captive washer assemblies, otherwise known as SEMS. SEMS products may include screws, tapping screws, or bolts in sizes No. 0 through 1/2 in. diameters in various grades and materials. The word SEMS is recognized in the United States as a generic term applicable to screw and washer assemblies. Also included in this Standard is Nonmandatory Appendix A illustrating the relative proportions of plain and conical washer SEMS.