BS EN 14399-3:2015 pdf download.High-strength structural bolting assemblies for preloading – Part 3: System HR – Hexagon bolt and nut assemblies.
BS EN 14399-3 specifIes, together with EN 14399-1 and EN 14399-2, 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 or 8.8/10 and 10.9/10.
Bolting assemblies in accordance with this document have been designed to allow preloading of at least 0,7 ‘ub X As 1) according to EN 1993-1-8 (Eurocode 3) and to obtain ductility predominantly by plastic elongation of the bolt. For this purpose the components have the following characteristics:
— normal nut height (style 1). see EN ISO 4032;
— thread length of the bolt according to ISO 888.
Bolting assemblies in accordance with 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 bolting assemblies are correctly used if satisfactory results are to be obtained. For recommendations concerning proper application, reference to EN 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.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 14399-1, High-strength structural bolting assemblies for preloading – Part 1: General requirements
EN 14399-2. High-strength structural bolting assemblies for preloading – Part 2: Suitability for preloading
EN 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 washers
EN 26157-1, Fasteners – Surface discontinuities – Part 1: Bolts, screws and studs for general requirements (ISO 6 157-1)
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 with specified property classes – Coarse thread and fine pitch thread (ISO 898-2)
EN ISO 3269, Fasteners – Acceptance inspection (ISO 3269)
EN ISO 4759-1, Tolerances for fasteners – Part 1: Bolts, screws, studs and nuts – Product grades A, B and C (ISO 4759-1)
EN ISO 6157-2, Fasteners – Surface discontinuities – Part 2: Nuts (ISO 6157-2)
EN ISO 10684, Fasteners – Hot dip galvanized coatings (ISO 10684)
ISO 261, IsO general purpose metric screw threads – General plan
ISO 965-2, ISO general purpose metric screw threads – Tolerances- Part 2: Limits of sizes for general purpose external and internal screw threads – Medium quality
ISO 965-5, Iso general purpose metric screw threads – Tolerances – Part 5: Limits of sizes for internal screw threads to mate with hot-dip galvanized external screw threads with maximum size of tolerance position before galvanizing
ISO 3508, Thread run-outs for fasteners with thread in accordance with Iso 261 and ISO 262
3 Bolts
3.1 Dimensions of bolts
See Figure 1 and Table 2.BS EN 14399-3 pdf download.

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