螺纹大径：Major Diam 中径：Pitch diam 底径：Minor diam 通止规：Go/No go gage 机械性能：mechanical and physical properties unified thread 统一英制螺纹 Lustrate hydrogen after galvanizing to avoid hydrogen embrittlement 镀后去氢，防止氢脆 Case carburization 表面渗碳 With across flats 对边 With across corners 对角 Radius of fillet:头下圆角 Transition thread length 过度螺纹 Wrenching height 扳拧高度 Rockwell 铬氏硬度 Vickers 维氏硬度 Brinell 布氏硬度 Metallography microscope 金相显微镜 Salt spray device 盐雾试验箱 Tensile testing machine 拉力试验机 Cold forming 冷打 Hot forging 红镦 P C 8 property class 8 机械性能8级 原材料：Raw material 球化退火：Annealing 冷拔：Drawing 冷镦：Forming 机加工：Machining 螺纹成型：Roll Threading 热处理：heat-treatment 表面处理：finish 去氢：Lustrating hydrogen 检验：Inspection 包装：Packing 入库：Stocking 车床：lathe 磨制：grinding 红打：hot forging 冲压：punching