本文件规定了六角凹头沉头螺钉的特点，该螺钉由于头部设计而降低了承载能力，由钢和不锈钢制成，具有公制粗牙螺纹M2至M10，产品等级为A级。 如果在某些情况下需要其他规格，则可从ISO 3506‑1中选择不锈钢等级，并从ISO 888或ISO 4753中选择尺寸选项。 注1:降低的承载能力（与沉头尺寸以及本文件中规定的六角套筒贯穿件相关）意味着特定标记（性能等级前加零）显示的极限拉伸载荷限制。对于所有尺寸和所有属性类别，假设头部的可加载性为螺纹的80%；见表3。 注2 ISO 14582中规定了具有全承载能力的内六角沉头螺钉（高头），但由于头部高度不同，这些产品不可互换。 注3:需要特别注意确保埋头孔与组件中埋头孔的支承面对齐。

This document specifies the characteristics of hexalobular socket countersunk flat head screws with reduced loadability due to head design, in steel and stainless steel, with metric coarse pitch threads M2 to M10, and with product grade A. If in certain cases other specifications are requested, stainless steel grades can be selected from ISO 3506‑1, and dimensional options from ISO 888 or ISO 4753. NOTE 1   The reduced loadability (related to the countersunk 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 3. NOTE 2   Hexalobular socket countersunk head screws (high head), with full loadability are specified in ISO 14582, but these products are not interchangeable, because of different head heights. NOTE 3   Particular attention is needed to ensure alignment of the countersunk head with the bearing surface of the countersink in the assembly.