BS EN 14399-7-2007 预荷载高强度结构螺栓组件.第7部分HR系统.沉头螺栓和螺母组件.pdf
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1、BRITISH STANDARD BS EN 14399-7:2007 High-strength structural bolting assemblies for preloading Part 7: System HR Countersunk head bolt and nut assemblies ICS 21.060.01 BS EN 14399-7:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 Janu
2、ary 2008 BSI 2008 ISBN 978 0 580 54249 7 National foreword This British Standard is the UK implementation of EN 14399-7:2007. The UK participation in its preparation was entrusted by Technical Committee FME/9, Nuts, bolts and accessories/steering committee, to Subcommittee FME/9/1, Material. A list
3、of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal
4、 obligations. Amendments/corrigenda issued since publication DateComments W - - - - - - - - - 7 7- 7 -8 - 6 -7 - 7 - 200 mm. g lg max. = lnom. b ls min. = lg max. 5P h When ls min. as calculated by the equation in g is less than knom. + 0,5d then its value shall be knom. + 0,5d and lg max = ls min.+
5、 3P. Bolts with shortened thread length are shown above the line. i kmax. includes the height of embossed marking, if any. j kmin. excludes the height of embossed marking, if any. EN 14399-7:2007 (E) 11 4.3 Specification for bolts and reference standard Table 3 Specifications for bolts and reference
6、 standards Material Steel General requirements EN 14399-1a Tolerance 6gb Thread International Standards ISO 261, ISO 965-2 Property class 8.8 or 10.9 Mechanical properties European Standard EN ISO 898-1 Value KV,min = 27 J at -20 C Test specimenc ISO 148-1 Impact strength Test EN 10045-1 Product gra
7、de C except: dimension r. Tolerance for lengths 160 mm 4,0 mm Tolerances International Standard EN ISO 4759-1 Normal as processede hot dip galvanized EN ISO 10684 Surface finishd Others to be agreedf Surface discontinuities Limits for surface discontinuities are covered in EN 26157-1. Acceptability
8、For acceptance procedure, see EN ISO 3269. a For the time being EN 14399-1 refers only to EN 14399-3 and EN 14399-4 as far as dimensions and mechanical charac- teristics of the components and functional characteristics of the assemblies are concerned. Such references shall also apply to EN 14399-7.
9、b The tolerance class specified applies without surface finish. Hot-dip galvanized bolts are intended for assembly with oversize tapped nuts. c The preparation of the test specimens with V-notch in the fastener shall be as specified in EN ISO 898-1. d Attention is drawn to the need to consider the r
10、isk of hydrogen embrittlement in the case of bolts of property class 10.9, when selecting an appropriate surface treatment process (e.g. cleaning and coating), see the relevant coating standards. e “As processed“ means the normal finish resulting from manufacture with a light coating of oil. f Other
11、 coatings may be negotiated between the purchaser and the manufacturer provided they do not impair the mechanical properties or the functional characteristics. Coatings of cadmium or cadmium alloy are not permitted. 4.4 Marking of bolts High-strength structural countersunk bolts according to this pa
12、rt of this European Standard shall be marked with: a) property class marking in accordance with EN ISO 898-1 and the letters HR. EXAMPLE 1 10.9 HR b) the identification mark of the manufacturer of the assembly. It is permissible for the marking to be either embossed or indented on the top surface of
13、 the head. EXAMPLE 2 of bolt marking (see Figure 2): EN 14399-7:2007 (E) 12 Key 1 identification mark of the manufacturer of the assembly Figure 2 Example for marking of a bolt 5 Nuts NOTE This nut is identical with the nut specified in EN 14399-3. 5.1 Dimensions of nuts See Figure 3 and Table 4. Al
14、ternative form permissible a 15 to 30 b 110 to 130 Figure 3 Dimensions of nuts EN 14399-7:2007 (E) 13 Table 4 Dimensions of nuts a Dimensions in millimetres Thread d M12 (M14)b M16 (M18)b M20 M22 M24 M27 M30 M36 Pc 1,75 2 2 2,5 2,5 2,5 3 3 3,5 4 da max. 13 15,1 17,3 19,5 21,6 23,7 25,9 29,1 32,4 38,
15、9 min. 12 14 16 18 20 22 24 27 30 36 max. d d d d d d d d d d dw min. 20,1 21,86 24,9 27,70 29,5 33,3 38,0 42,8 46,6 55,9 e min. 23,91 27,12 29,56 32,95 35,03 39,55 45,20 50,85 55,37 66,44 max. 10,8 12,8 14,8 15,8 18 19,4 21,5 23,8 25,6 31 m min. 10,37 12,1 14,1 15,1 16,9 18,1 20,2 22,5 24,3 29,4 mw
16、 min. 8,3 9,7 11,3 12,1 13,5 14,5 16,2 18,1 19,5 22,4 max. 0,8 0,8 0,8 0,8 0,8 0,8 0,8 0,8 0,8 0,8 c min. 0,4 0,4 0,4 0,4 0,4 0,4 0,4 0,4 0,4 0,4 max. 22 24 27 30 32 36 41 46 50 60 s min. 21,16 23,16 26,16 29,16 31 35 40 45 49 58,8 t 0,38 0,42 0,47 0,52 0,58 0,63 0,72 0,80 0,87 1,05 a For hot dip ga
17、lvanized nuts the above dimensions apply before galvanizing. b Non-preferred sizes. c P is the pitch of thread. d dw max. = sactual. EN 14399-7:2007 (E) 14 5.2 Specification for nuts and reference standards Table 5 Specifications for nuts and reference standards Material Steel General requirements E
18、N 14399-1a Tolerance 6H or 6AZ Thread International Standards ISO 261, ISO 965-2, ISO 965-5 Property class 8b or 10b Mechanical properties European Standard EN 20898-2 Product grade B except dimensions m and d Tolerances International Standard EN ISO 4759-1c Normal as processedd hot dip galvanized E
19、N ISO 10684 Surface finish Others to be agreede Surface discontinuities Limits for surface discontinuities are covered in EN ISO 6157-2. Acceptability For acceptance procedure, see EN ISO 3269. a For the time being EN 14399-1 refers only to EN 14399-3 and EN 14399-4 as dimensions and mechanical char
20、acteristics of the components and functional characteristics of the assembly are concerned. Such references shall also apply to EN 14399-7. b For proof load values, see 4.3. All other mechanical properties as specified in EN 20898-2. c Except tolerance of total run-out t of bearing face, see Table 4
21、. d “As processed“ means the normal finish resulting from manufacture with a light coating of oil. e Other coatings may be negotiated between the purchaser and the manufacturer provided they do not impair the mechanical properties or the functional characteristics. Coatings of cadmium or cadmium all
22、oys are not permitted. EN 14399-7:2007 (E) 15 5.3 Proof load values of nuts Table 6 Proof load values of nuts Property class 8 10 Nominal stress area of standard test mandrel As Tolerance class 6H or 6AZ Tolerance class 6H or 6AZ Thread d mm2 Proof load (As Sp), N M12 84,3 84 300 97 800 (M14) 115 11
23、5 000 133 400 M16 157 157 000 182 100 (M18) 192 192 000 222 700 M20 245 245 000 284 200 (M22) 303 303 000 351 200 M24 353 353 000 409 500 (M27) 459 459 000 532 400 M30 561 561 000 650 800 M36 817 817 000 947 700 The proof load values are based on the following stresses under proof load: for nuts of
24、property class 8: 1 000 MPa for nuts of property class 10: 1 160 MPa Where nuts are to be accepted on the basis of hardness values, the appropriate limits shall be those given in Table 7. Table 7 Hardness values of nuts, if specified Nut Hardness limits property class 8, tolerance class 6H as specif
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- BS EN 14399-7-2007 预荷载高强度结构螺栓组件.第7部分HR系统.沉头螺栓和螺母组件 14399 2007 荷载 强度 结构 螺栓 组件 部分 HR 系统 螺母
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