High-Strength Structural Bolting Assemblies for Preloading - Part 9: System HR or HV - Bolt Face Washers (HB)
EN 14399-9 (HB washer) - 2018 预负载用高强度结构螺栓连接副，第9部分：HR或HV系统 - 螺栓面垫圈（HB）
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