BS EN ISO 898-5:2012
碳钢及合金钢制紧固件的机械性能.带制定硬度等级的固定螺丝和类似螺纹紧固件.粗牙螺纹和细牙螺纹
Mechanical properties of fasteners made of carbon steel and alloy steel. Set screws and similar threaded fasteners with specified hardness classes. Coarse thread and fine pitch thread