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1、 W - - - - - - - - 7 7- 7 -8 - - 7 7 7 - 200 mm. f dw max. = sactual. g lg max. = lnom. b, ls min. = lg max. 5 P h When ls min. as calculated by the formula in g is less than 0,5 d then its value shall be 0,5 d and lg max. = ls min. + 3 P. They are shown above the stepped line. NOTE Dimensions of th
2、e break-neck of the bolt are not specified for the following reasons: dimensions and tolerances of the break-neck are defined by the manufacturer of the bolt according to material, manufacturing process and lubrication. The precise dimensions and tolerances of the break-neck ensure that the specifie
3、d preload is achieved when the fracture of the spline-end of the bolt occurs under torsional stress. EN 14399-10:2009 (E) 11 Table 2 Dimensions of cup head bolts a b Dimensions in millimetres Thread d M12 M16 M20 M22 M24 M27 M30 dk min. 21 27 34 38,5 43 48 52 dw min. 20 26 33 37 41 46 50 k nom. 8 10
4、 13 14 15 17 19 max. 8,8 10,8 13,9 14,9 15,9 17,9 20,0 min. 7,2 9,2 12,1 13,1 14,1 16,1 18,0 R nom. 18 20 22 23 25 27 30 a For hot-dip galvanized bolts, the dimensions apply before galvanizing. b For all other dimensions, see Table 1. Table 3 Dimensions of spline-end a Dimensions in millimetres Thre
5、ad d M12 M16 M20 M22 M24 M27 M30 Width across flats of spline-end, sba nom. 7,7 11,3 14,1 15,4 16,8 19,0 21,1 max. 8,0 11,6 14,4 15,7 17,1 19,3 21,4 min. 7,4 11,0 13,8 15,1 16,5 18,7 20,8 Width across corners of spline-end, eb b min. 8,36 12,43 15,60 17,06 18,65 21,13 23,50 Length of spline-end, F1
6、min. 11,0 13,0 15,0 15,5 16,0 19,0 21,0 Break off length, F2 max. 16,0 18,0 20,0 21,0 21,5 24,0 26,0 a For hot-dip galvanized bolts, the dimensions apply before galvanizing except for sb max. which applies after galvanizing. b eb min. = 1,13 sb min. EN 14399-10:2009 (E) 12 4.2 Specification for bolt
7、s and reference standards The specifications for bolts and reference standards are given in Table 4. Table 4 Specifications for bolts and reference standards Material Steel General requirements EN 14399-1 Thread Tolerance 6 g a Standards ISO 261, ISO 965-2 Mechanical properties Property class 10.9 S
8、tandard EN ISO 898-1 Impact strength Value KV, min = 27 J at 20 C Test piece b ISO 148-1 Test EN 10045-1 Tolerances Product grade C except: dimensions c and r. Tolerance for lengths 150 mm: 4,0 mm Standard EN ISO 4759-1 Surface finish c Normal as processed d Hot dip galvanized EN ISO 10684 Others to
9、 be agreed e Additional protection against corrosion After tightening, the non-coated area appearing at the end of the bolt resulting from the fracture of the spline-end may be protected against corrosion by applying an efficient protective treatment (e.g. by a complementary zinc-rich paint). Surfac
10、e discontinuities Limits for surface discontinuities are covered in EN 26157-1. Acceptability For acceptance procedure, see EN ISO 3269. a The tolerance class specified applies before hot-dip galvanizing. Hot-dip galvanized bolts are intended for assembly with oversize tapped nuts. b The location of
11、 Charpy V-notch test pieces in the bolt shank shall be as specified in EN ISO 898-1. c Attention is drawn to the need to consider the risk 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 t
12、he relevant coating standards. 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. Coati
13、ngs of cadmium or cadmium alloy are not permitted. 4.3 Marking of bolts High-strength structural bolts according to this part of this European Standard shall be marked with (see Figure 3 for marking examples): a) the property class marking in accordance with EN ISO 898-1 and the letters HRC; EXAMPLE
14、 10.9 HRC 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 the head. EN 14399-10:2009 (E) 13 a) EXAMPLE of bolt marking for hexagonal head b) EXAMPLE of bolt marking for cup head Key 1 Identifica
15、tion mark of the manufacturer of the assembly Figure 3 Examples for bolt marking 5 Nuts 5.1 Dimensions of nuts Dimensions of nuts (see Figure 4), shall be in accordance with Table 5 or Table 6 at the manufacturers option. EN 14399-10:2009 (E) 14 Alternative form permissible Key a 15 to 30 b 110 to 1
16、30 Figure 4 Dimension of the nut Table 5 Dimensions of nuts according to EN 14399-3:2005 (HR) a Dimensions in millimetres Thread d M12 M16 M20 M22M24 M27 M30 P b 1,75 2 2,5 2,5 3 3 3,5 da max. 13 17,3 21,6 23,7 25,9 29,1 32,4 min. 12 16 20 22 24 27 30 dw max. c min. 20,1 24,9 29,5 33,3 38,0 42,8 46,
17、6 e min. 23,91 29,56 35,03 39,55 45,20 50,85 55,37 m max. 10,8 14,8 18 19,4 21,5 23,8 25,6 min. 10,37 14,1 16,9 18,1 20,2 22,5 24,3 mw min. 8,3 11,3 13,5 14,5 16,2 18,1 19,5 c max. 0,8 0,8 0,8 0,8 0,8 0,8 0,8 min. 0,4 0,4 0,4 0,4 0,4 0,4 0,4 s max. 22 27 32 36 41 46 50 min. 21,16 26,16 31 35 40 45 4
18、9 t 0,38 0,47 0,58 0,63 0,72 0,80 0,87 a For hot dip galvanized nuts, the dimensions apply before galvanizing. b P is the pitch of thread. c d w, max. = sactual. When nuts with height m = 1 d are used, they shall be according to Table 5 except for dimensions m and mw, which shall be according to Tab
19、le 6. EN 14399-10:2009 (E) 15 Table 6 Dimensions of nuts with height m = 1 d (HRD) a Dimensions in millimetres Thread d M12 M16 M20 M22M24 M27 M30 m max. 12,35 16,35 20,65 22,65 24,65 27,65 30,65 min. 11,65 15,65 19,35 21,35 23,35 26,35 29,35 mw min. 9,32 12,52 15,48 17,08 18,68 21,08 23,48 a For ho
20、t dip galvanized nuts, the dimensions apply before galvanizing. 5.2 Specification for nuts and reference standards The specifications for nuts and reference standards are given in Table 7. Table 7 Specifications for nuts and reference standards Material Steel General requirements EN 14399-1 Thread T
21、olerance 6H or 6AZ a Standards ISO 261, ISO 965-2, ISO 965-5 Mechanical properties Property class 10 b Standard EN 20898-2 Tolerances Product grade B except dimensions m and c Standard EN ISO 4759-1 c Surface finish Normal as processed d Hot dip galvanized EN ISO 10684 Others to be agreed e Surface
22、discontinuities Limits for surface discontinuities are covered in EN ISO 6157-2. Acceptability For acceptance procedure, see EN ISO 3269. a Thread tolerance is 6 H for non-coated nuts and 6 AZ for hot-dip galvanized nuts. b For proof load values, see 5.3. All other mechanical properties as specified
23、 in EN 20898-2. c Except tolerance on perpendicularity of bearing face, see tolerance t in Table 5. 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 impa
24、ir the mechanical properties or the functional characteristics. Coatings of cadmium or cadmium alloys are not permitted. 5.3 Proof load values of nuts Proof load values of nuts are specified in Table 8. EN 14399-10:2009 (E) 16 Table 8 Proof load values of nuts Thread d Nominal stress area of standar
25、d test mandrel As mm2 Property class 10 Tolerance class 6 H or 6 AZ Proof load (As Sp), N Nuts according to EN 14399-3 (HR) a Nuts with height m = 1 d (HRD) b M12 84,3 97 800 104 900 M16 157 182 100 195 500 M20 245 284 200 305 000 M22 303 351 200 377 200 M24 353 409 500 439 500 M27 459 532 400 571 5
26、00 M30 561 650 800 698 400 a The proof load values are based on the stress under proof load of 1 160 MPa. b The proof load values are based on the stress under proof load of 1 245 MPa. 5.4 Decarburization of the nut thread The decarburization of the nut thread, when measured analogously to external
27、threads as given in EN ISO 898-1, shall not exceed G = 0,015 mm. 5.5 Marking of nuts High-strength structural nuts according to this part of this European Standard shall be marked with (see Figure 5 for marking examples): a) the property class marking in accordance with EN 20898-2, and 1) the letter
28、s HR for nuts according to EN 14399-3, or 2) the letters HRD for nuts with height m = 1 d with dimension according to Table 6; EXAMPLE 10 HR b) the identification mark of the manufacturer of the assembly. The marking shall be indented on either the top or bottom face of chamfered nuts and shall be e
29、ither indented or embossed on the non-bearing face of washer faced nuts. EN 14399-10:2009 (E) 17 a) EXAMPLE of nut marking for nut according to EN 14399-3 b) EXAMPLE of nut marking for nut with height m = 1 d: Key 1 Identification mark of the manufacturer of the assembly Figure 5 Examples for nut ma
30、rking 6 Designation of the bolt/nut assembly EXAMPLE 1 Designation of a bolt/nut assembly for high-strength structural bolting with calibrated preload, system HRC, consisting of hexagon head bolt with thread M16, nominal length l = 80 mm, property class 10.9, and a hexagon nut with large width acros
31、s flats, height according to EN 14399-3, thread M16 and property class 10: Hexagon head bolt/nut assembly EN 14399-10 M16 80 10.9/10 HRC EXAMPLE 2 Designation of a bolt/nut assembly for high-strength structural bolting with calibrated preload, system HRC, consisting of a cup head bolt with thread M1
32、6, nominal length l = 80 mm, property class 10.9, and a hexagon nut with large width across flats, height m = 1 d (symbol D), thread M16 and property class 10: Cup head bolt/nut assembly EN 14399-10 M16 80 10.9/10D HRC If surface finishes other than “as processed“ are required, the specified surface
33、 finish shall be added to the designation, e.g. for hot dip galvanizing (tZn): Hexagon head bolt/nut assembly EN 14399-10 M16 80 10.9/10 HRC tZn 7 Associated washers Bolt/nut assemblies according to this part of this European Standard shall be assembled with washers according to EN 14399-6 or accord
34、ing to EN 14399-5. Washers according to EN 14399-5 shall only be used under the nut. EN 14399-10:2009 (E) 18 8 Functional characteristics of the bolt/nut/washer assembly 8.1 General There shall be sufficient suitable lubricant on the nuts or on the bolts and washers in the as delivered condition to
35、ensure that seizure will not take place on tightening the assembly and that the required preload is obtained. The adequacy with which the preload is obtained on tightening calibrated preload bolt/nut/washer(s) assemblies depends on the satisfactory control of the behaviour of two main parameters: th
36、e lubrication performance, the spline-end torsion resistance. Therefore the functional characteristics of the bolt/nut/washer(s) assembly with calibrated preload according to 8.4 shall be achieved when tested in accordance with 8.2 and 8.3. NOTE 1 Experience has shown that, for certain preloaded bol
37、ted connection in metallic structures, installation conditions are such that it is not possible to use the shear wrench. In this case, tightening is usually carried out with the control torque method and k-class K2 (k-factor and Vk) is necessary. Four full threads (in addition to the thread run out)
38、 shall remain clear between the bearing surface of the nut and the unthreaded part of the shank. NOTE 2 For further background information as to these functional characteristics see EN 14399-2. Special testing conditions and procedures given in EN 14399-2:2005, Annex A, may be applied except c) and
39、d) 2). 8.2 Suitability test for preloading 8.2.1 General See EN 14399-2 and 8.2.2 to 8.4. 8.2.2 Test assemblies The test shall be carried out on assemblies that include at least one washer, under the nut. Test assemblies shall be taken from a single assembly lot or extended assembly lot (see EN 1439
40、9-1). Each component of a test assembly shall be used once only. The test shall be carried out on test assemblies in the condition of delivery without alteration of the lubrication of the various components. 8.2.3 Test results Evaluation of test results shall be in accordance with EN 14399-2. 2 shal
41、l be measured from the fracture of the spline-end and shall exceed the value of 2 specified in EN 14399-3:2005. 8.3 Suitability test for calibrated preload This additional part of the suitability test shall be carried out on test assemblies from the same assembly lot as for 8.2, in order to check th
42、at the spline-end breaks at the required preload value. The test conditions defined in EN 14399-2:2005, Clauses 6 and 8, shall be used. The test apparatus shall be according to one of the following: EN 14399-10:2009 (E) 19 either the shear wrench according to 3.1 and the bolt force measurement devic
43、e, or the shear wrench according to 3.1 and the test apparatus defined in EN 14399-2, or the test apparatus defined in EN 14399-2 equipped with co-axial sockets designed to fit the spline-end of the bolt, able to turn and break the spline-end similarly to the shear wrench. NOTE This test may be comb
44、ined with the suitability test for preloading as defined in 8.2. The tightening stops when the spline-end fractures. Fri which is the individual value of the bolt force when failure by fracture occurs in the spline-end shall be measured. 8.4 Requirements For assemblies with HR nuts, the requirements
45、 of EN 14399-3:2005, k-class K2, apply. For assemblies with HRD nuts, the requirements of EN 14399-3:2005, k-class K0, apply. The values for the bolt force at the fracture of the spline-end (Fr) shall fulfil the requirements specified in Table 9. The following requirements apply: Individual value of
46、 Fri 0,7 fub As Mean value Fr mean 0,77 fub As Coefficient of variation of Fr VFr 0,10 with mean r Fr Fr F s V (1) where sFr is the standard deviation 1 - ) - ( 2 mean rri Fr n FF s (2) Five tests shall be carried out. EN 14399-10:2009 (E) 20 Table 9 Limiting values of bolt force at the fracture of
47、the spline-end Thread d Nominal stress area of standard test mandrel As Fr min 0,7 fub As a Fr mean min 0,77 fub As a mm2 N N M12 84,3 59 010 64 911 M16 157 109 900 120 890 M20 245 171 500 188 650 M22 303 212 100 233 310 M24 353 247 100 271 810 M27 459 321 300 353 430 M30 561 392 700 431 970 a f ub is the nominal tensile strength of the bolt (Rm, nom). EN 14399-10:2009 (E) 21 Bibliography 1 EN 1090-2, Execution of steel structures and aluminium structures Part 2: Technical requirements for s