标准摘要
[中文适用范围]： 本文件规定了钢和不锈钢制成的六角头螺栓头螺钉（加载能力降低）的特征，其头部设计导致加载能力降低，螺纹为公制粗牙，规格从M3到M12，产品等级为A。在特定情况下，如果要求其他规格，性能等级和不锈钢等级可从ISO 898-1或ISO 3506-1中选择，尺寸选项可从ISO 888或ISO 4753中选择。注：降低的加载能力（与头部尺寸结合本文件规定的六角槽孔的穿透深度相关）意味着特定的标记（属性等级前加零）显示的极限拉伸载荷限制。所有尺寸和所有性能等级的头部加载能力假设为螺纹加载能力的80%，见表4。 [外文原描述]： This document specifies the characteristics of hexalobular socket button head screws with reduced loadability due to head design, in steel and stainless steel, with metric coarse pitch threads M3 to M12, and with product grade A. If, in certain cases, other specifications are requested, property classes and stainless steel grades can be selected from ISO 898-1 or ISO 3506-1, and the dimensional options from ISO 888 or ISO 4753. NOTE The reduced loadability (related to the head dimensions in combination with penetration of the hexalobular socket specified in this document) implies a limitation of ultimate tensile load shown by a specific marking (property class preceded by a zero). The loadability in the head is assumed to be 80 % of that in the thread for all sizes and all property classes, see Table 4 .
英文名称Fasteners — Button head screws with reduced loadability — Part 3: Hexalobular socket button head screws