High-strength Structural Bolting Assemblies for Preloading - Part 9: System HR or HV — Nut Face Washers (HN)
EN 14399-9 (HN washer) - 2009 预负载用高强度结构螺栓连接副，第9部分：HR或HV系统 - 螺母面垫圈（HN）
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