BS EN 14399-9:2009

Foreword
Introduction
1 Scope
2 Normative references
3 Direct tension indicators
  3.1 Dimensions
  3.2 Specifications and reference standards
  3.3 Performance test of direct tension indicators
  3.4 Test method for measuring compression loads
      (all finishes) on direct tension indicators
      3.4.1 General
      3.4.2 Testing apparatus
      3.4.3 Compression loading system
      3.4.4 Support blocks
      3.4.5 Bearing blocks
      3.4.6 Calibration
      3.4.7 Test Procedure
  3.5 Marking of the direct tension indicator
  3.6 Designation of the direct tension indicator
4 Nut face washers and bolt face washers
  4.1 Dimensions
  4.2 Specifications and reference standards for nut
      face washers and bolt face washers
  4.3 Marking
      4.3.1 Nut face washers
      4.3.2 Bolt face washers
  4.4 Designation
      4.4.1 Nut face washers
      4.4.2 Bolt face washers
5 Functional characteristics
  5.1 Assemblies
  5.2 Functional characteristics of direct tension
      indicators in the assembly
  5.3 Functional characteristics of the
      bolt/nut/washer(s)/direct tension
      indicator assembly
      5.3.1 General
      5.3.2 Test procedure
Annex A (informative) - Special testing conditions
        and procedures
Bibliography

Describes the requirements for assemblies of high-strength structural bolts and nuts, with large width across flats, of system HR or HV, including the requirements for the general dimensions, tolerances, materials and performance for two grades, H8 and H10, of compressible washer-type direct tension indicators, nut face washers and bolt face washers suitable for preloaded joints.

This document specifies, together with EN 14399-1, the requirements for assemblies of high-strength structural bolts and nuts, with large width across flats, of system HR or HV, including the requirements for the general dimensions, tolerances, materials and performance for two grades, H8 and H10, of compressible washer-type direct tension indicators, nut face washers and bolt face washers suitable for preloaded joints. The assemblies include the nominal thread sizes M12 up to and including M36 and property classes 8.8/8, 8.8/10 and 10.9/10. Bolt and nut assemblies to this document have been designed to allow preloading of at least 0,7 fub × As according to EN 1993-1-8 (Eurocode 3) and to obtain ductility predominantly by plastic elongation of the bolt for system HR according to EN 14399-3 or by plastic deformation of the engaged threads for system HV according to EN 14399-4; also countersunk and fit bolts according to EN 14399-7 and -8 respectively. Bolt and nut assemblies conforming to this document may include washer(s) according to EN 14399-6 or to EN 14399-5 (under the nut only). The purpose of the direct tension indicators is to show that a defined preload is achieved in the bolt. The direct tension indicator can be used alone or with bolt face washers or nut face washers conforming to this standard. In either case the direct tension indicators shall be used as part of an assembly in accordance with EN 14399-1. To comply with EN 14399-1, the assemblies shall be supplied by one manufacturer include bolts, nuts, washers and direct tension indicators. NOTE 1 Attention is drawn to the importance of ensuring that the assemblies are correctly used if satisfactory results are to be obtained. The test method for suitability for preloading is specified in EN 14399-2 and supplemented by Clause 5. Guidance on the use of compressible washer-type direct tension indicators is given in EN 1090-2. (...)