BS EN 14399-3:2015
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High-strength structural bolting assemblies for preloading – System HR. Hexagon bolt and nut assemblies
| Published By | Publication Date | Number of Pages |
| BSI | 2015 | 32 |
This European Standard 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 f ub× A s 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:
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normal nut height (style 1), see EN ISO 4032 ;
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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).
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 5 | Foreword |
| 6 | Introduction |
| 7 | Table 1 — Composition of high-strength structural bolting assemblies and component marking |
| 8 | 1 Scope 2 Normative references |
| 9 | 3 Bolts 3.1 Dimensions of bolts Figure 1 — Dimensions of bolts |
| 10 | Table 2 — Dimensions of bolts |
| 13 | 3.2 Specification for bolts and reference standard Table 3 — Specifications for bolts and reference standards 3.3 Marking of bolts |
| 14 | Figure 2 — Example of bolt marking 4 Nuts 4.1 Dimensions of nuts Figure 3 — Dimensions of nuts |
| 15 | Table 4 — Dimensions of nuts |
| 16 | 4.2 Specification for nuts and reference standards Table 5 — Specifications for nuts and reference standards |
| 17 | 4.3 Proof load values of nuts Table 6 — Proof load values of nuts Table 7 — Hardness values of nuts, if specified 4.4 Decarburization of the nut thread 4.5 Marking of nuts |
| 18 | Figure 4 — Example of nut marking 5 Designation of the bolt/nut assemblies 6 Associated washers 7 Functional characteristics of the bolt/nut/washer(s) assembly 7.1 General |
| 19 | 7.2 Maximum individual value of the bolt force during fitness for purpose test (Fbi,max) 7.3 Values of angle Δθ1 Table 8 — Values for Δθ1 7.4 Values of angle Δθ2 Table 9 — Values for Δθ2 7.5 Individual values of the k-factor (ki), mean value of the k-factor (km) and coefficient of variation of the k-factor (Vk) 7.5.1 Individual values of the k-factor (ki) for k-class K1 |
| 20 | 7.5.2 Mean value of the k-factor (km) and coefficient of variation of the k-factor (Vk) for k-class K2 |
| 21 | Annex A (normative) Clamp lengths and grip lengths A.1 Clamp lengths for bolting assemblies with one or two washers Figure A.1 — Clamp Length Σt |
| 22 | Table A.1 — Clamp Length with one or two washers Σt |
| 24 | A.2 Grip lengths for bolting assemblies with one or two washers Figure A.2 — Grip Length with one washer ts1 |
| 25 | Table A.2 — Grip lengths with one washer ts1 |
| 27 | Figure A.3 — Grip Length with two washers ts2 |
| 28 | Table A.3 — Grip lengths with two washers ts2 |
| 30 | Bibliography |
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BS EN 14399-3:2015 – TC:2020 Edition
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