航空航天外螺纹紧固件的标准公制系列螺纹-直径-螺距组合的面积是在以下条件下确定的:无螺纹杆中的极限剪切应力或载荷面积。螺纹中极限拉伸应力或载荷的面积。螺纹中的应力耐久性测试负载区域。高温下应力断裂试验负荷的区域。拉伸疲劳试验载荷的区域。

Areas for the standard metric series of thread diameter-pitch combinations for aerospace externally threaded fasteners are established for the following conditions:Area for ultimate shear stress or load in unthreaded shank.Area for ultimate tensile stress or load in thread.Area for stress durability test load in thread.Area for stress-rupture test load at elevated temperature.Area for tension-tension fatigue test load.