scope:

This document specifies, together with EN 14399 1, the requirements for assemblies of high-strength structural bolts and nuts of system HR or HV and 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 with large widths across flats, thread sizes M12 to 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 Ã- 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 a washer according to EN 14399 6 or to EN 14399 5 (under the nut only).
The purpose of indicators is to show that a defined preload is achieved in the bolt and it can be used alone or else with bolt face washers or nut face washers conforming to this standard. In either case the indicators shall be used as part of an assembly in accordance with EN 14399 1.
To comply with EN 14399 1, the assemblies to be supplied by one manufacturer include bolts, nuts, washers and indicators.
NOTE 1 Attention is drawn to the importance of ensuring that the bolts 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 prEN 1090 2.
NOTE 2 Compressible washer-type direct tension indicators are also known as load indicating washers.