标准摘要
[中文适用范围]： 本文件规定了六角花形内六角沉头螺钉（带 collar，即带颈）的特征，其承载能力因头部设计而降低，材质为钢，采用公制粗牙螺纹 M3 至 M12，产品等级为 A。 在某些情况下，如果要求其他规格，可从 ISO 898-1 或 ISO 3506-1 中选择性能等级和不锈钢等级，并从 ISO 888 或 ISO 4753 中选择尺寸选项。 注：降低的承载能力（与头部尺寸结合本文件规定的六角花形内孔的穿透深度有关）意味着极限拉伸载荷受到限制，并通过特定标记表示（性能等级前加零）。对于所有尺寸和所有性能等级，头部中的承载能力假定为螺纹中承载能力的 80%，见表 4。 [外文原描述]： This document specifies the characteristics of hexalobular socket button head screws with collar with reduced loadability due to head design, in 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 4: Hexalobular socket button head screws with collar