High-strength structural bolting assemblies for preloading - System HR or HV. Direct tension indicators for bolt and nut assemblies Ingestion-build-135476 ISO/TS 12869 on the detection

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High-strength structural bolting assemblies for preloading - System HR or HV. Direct tension indicators for bolt and nut assemblies Ingestion-build-135476 ISO/TS 12869 on the detection1 Scope This document specifies, together with EN 143991 and EN 143992, the requirements for direct tension indicators, nut face washers (HN) and bolt face washers (HB) as part of high strength structural bolting assemblies suitable for preloaded joints. These direct tension indicators are specified as part of high strength structural bolting assemblies of system HR or HV in accordance with EN 143993, EN 143994, EN 143997 or EN 143998, with nominal