This document specifies, together with EN 14399-1, the requirements for assemblies of high-strength structural bolts
and nuts of system HR suitable for preloaded joints with large widths across flats, thread sizes M12 to M36 and property
classes 8.8/8 and 10.9/10.
Bolt and nut assemblies to this document have been designed to allow preloading of at least 0,7 fub×As
1)
according
to ENV 1993-1-1 (Eurocode 3) and to obtain ductility predominantly by plastic elongation of the bolt. For this purpose
the components have the following characteristics:
nut height according to style 1 (see EN ISO 4032)
thread length of the bolt according to ISO 888
Bolt and nut assemblies to this document include washers 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 satisfactory result are to be obtained.
For recommendations concerning proper application, reference to ENV 1090-1 is made.
The test method for suitability for preloading is specified in EN 14399-2.
BS EN 14399-3:2005 Referenced Document
EN 10045-1 Metal Products, Mechanical Tests, Charpy Impact Tests, Test Specimens, Testing Conditions
EN 14399-1 High-strength structural bolting assemblies for preloading - Part 1: General requirements*, 2015-02-01 Update
EN 14399-2 High-strength structural bolting assemblies for preloading - Part 2: Suitability for preloading*, 2015-02-01 Update
EN 14399-5 High-strength structural bolting assemblies for preloading - Part 5: Plain washers*, 2015-02-01 Update
2015BS EN 14399-3:2015 High-strength structural bolting assemblies for preloading. System HR. Hexagon bolt and nut assemblies
2009BS EN 14399-10:2009 High-strength structural bolting assemblies for preloading - Part 10:System HRC - Bolt and nut assemblies with calibrated preload
1969BS 4395-2:1969 Specification for high strength friction grip bolts and associated nuts and washers for structural engineering. Higher grade bolts and nuts and general grade washers