标 准 编 号:BS EN 14399-9-2009 简体中文标题:预加载高强度结构螺栓总成.系统HR或HV.螺栓和螺母总成的直接拉张器 繁体中文标题:预加载高强度结构螺栓总成.系统HR或HV.螺栓和螺母总成的直接拉张器 English Name: High-strength structural bolting assemblies for preloading - Part 9: System HR or HV - Direct tension indicators for bolt and nut assemblies;