航空航天外螺纹紧固件的标准公制系列螺纹-直径-节距组合区域适用于以下条件: a、 无螺纹杆中极限剪切应力或载荷的面积。b、 螺纹中极限拉伸应力或载荷的面积。c、 螺纹中的应力耐久性测试负载区域。d、 高温下应力断裂试验负荷的区域。e、 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: a. Area for ultimate shear stress or load in unthreaded shank.b. Area for ultimate tensile stress or load in thread.c. Area for stress durability test load in thread.d. Area for stress-rupture test load at elevated temperature.e. Area for tension-tension fatigue test load.