规定了主要用于法兰螺栓连接和其他承压用途的紧固件的要求。涵盖温度范围为-50摄氏度至+300摄氏度的公制系列，以及温度范围为-250摄氏度至+575摄氏度的英制系列。附录涉及英制系列双头螺栓在高温下的强度和性能、螺纹垂直度检查方法、机械性能取样、英制螺栓的材料标准以及英制系列双头螺栓和螺母的公制等效物。

Specifies requirements for fasteners mainly intended for bolting for flanges and other pressure-containing purposes. Covers a metric series for the temperature range -50 degrees Celsius to +300 degrees Celsius and an inch series for -250 degrees Celsius to +575 degrees Celsius. Appendices deal with strength and performance of inch series studbolts at elevated temperatures, method for checking squareness of thread, sampling for mechanical properties, material standards for inch bolting and metric equivalents for inch series studbolts and nuts.