BS EN 14399-10:2009

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Bolts
  4.1 Dimensions of bolts
  4.2 Specification for bolts and reference standards
  4.3 Marking of bolts
5 Nuts
  5.1 Dimensions of nuts
  5.2 Specification for nuts and reference standards
  5.3 Proof load values of nuts
  5.4 Decarburization of the nut thread
  5.5 Marking of nuts
6 Designation of the bolt/nut assembly
7 Associated washers
8 Functional characteristics of the bolt/nut/washer assembly
  8.1 General
  8.2 Suitability test for preloading
  8.3 Suitability test for calibrated preload
  8.4 Requirements
Bibliography

Describes the requirements for assemblies of high-strength structural bolts and nuts of system HRC suitable for preloaded joints, with hexagon head (large widths across flats) or cup head, thread sizes M12 to M30 and property class 10.9/10.

This part of this European Standard specifies, together with EN 14399-1, the requirements for assemblies of high-strength structural bolts and nuts of system HRC suitable for preloaded joints, with hexagon head (large widths across flats) or cup head, thread sizes M12 to M30 and property class 10.9/10. Bolt and nut assemblies conforming to this part of this European Standard have been designed to allow preloading of at least 0,7 fub X As ) according to EN 1993-1-8:2005 (Eurocode 3) and to obtain ductility predominantly by plastic elongation of the bolt. For this purpose the components have the following characteristics: - nut according to EN 14399-3, or - nut with height m = 1 d, - thread length of the bolt according to ISO 888. Bolt and nut assemblies conforming to this part of this European Standard include washer(s) according to EN 14399-6 or to EN 14399-5 (under the nut only). NOTE Attention is drawn to the importance of ensuring that the bolts are correctly used if a satisfactory result is to be obtained. The test method for suitability for preloading is specified in EN 14399-2 and in Clause 8.