BS EN 14399-7:2018 pdf free.High-strength structural boltingassemblies for preloading System HR- Countersunk head bolt and nut assemblies.
BS EN 14399-7 This European Standard specifies, together with EN 14399-1 and EN 14399-2, the requirements forassemblies of high-strength structural countersunk bolts and nuts of system HR suitable for preloadedjoints with thread sizes M12 to M36 and property classes 8.8/8 or 8.8/10 and 10.9/10.
Bolting assemblies in accordance with this document have been designed to allow preloading of at least0,7 fub ×A,1) according to EN 1993-1-8 (Eurocode 3) and to obtain ductility predominantly by plasticelongation of the bolt. For this purpose the components have the following characteristics:
-regular nut height according to style 1,see EN ISO 4032;
-thread length of the bolt according to lSo 888.
Bolting assemblies in accordance with this document include washers according to EN 14399-6 or toEN 14399-5.
NOTE Attention is drawn to the importance of ensuring that bolting assemblies are correctly used ifsatisfactory results are to be obtained. For recommendations concerning proper application，reference toEN 1090-2 is made.
General requirements and requirements for suitability for preloading are specified in EN 14399-2.Clamp lengths and grip lengths for the bolting assemblies are specified in the normative Annex A.2Normative references
The following documents, in whole or in part, are normatively referenced in this document and areindispensable for its application. For dated references,only the edition cited applies. For undatedreferences, the latest edition of the referenced document (including any amendments) applies.
EN14399-1,High-strength structural bolting assemblies for preloading – Part 1: General requirementsEN14399-2,High-strength structural bolting assemblies for preloading – Part 2:Suitability for preloadingEN 14399-5,High-strength structural bolting assemblies for preloading – Part 5: Plain washers
EN 14399-6,High-strength structural bolting assemblies for preloading – Part 6: Plain chamfered washersEN 14399-9,High-strength structural bolting assemblies for preloading – Part 9: System HR or HV – Directtension indicators for bolt and nut assemblies
EN 26157-1,Fasteners – Surface discontinuities – Part 1: Bolts, screws and studs for general requirements(1SO 6157-1)
EN ISO 898-1,Mechanical properties of fasteners made of carbon steel and alloy steel – Part 1: Bolts,screws and studs with specified property classes – Coarse thread and fine pitch thread (ISo 898-1)
EN ISO 898-2,Mechanical properties of fasteners made of carbon steel and alloy steel – Part 2: Nuts withspecified property classes – Coarse thread and fine pitch thread (1so 898-2)
EN ISO 3269, Fasteners – Acceptance inspection (ISo 3269).BS EN 14399-7 pdf download.