1、July 2007DEUTSCHE NORM English price group 7No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 21.060.10!$K3h“1401669w
2、ww.din.deDDIN 7968Hexagon fit bolts for structural steel bolting, for supply with hexagonnutsSechskant-Passschrauben mit Sechskantmutter fr StahlkonstruktionenSupersedesDIN 7968:1999-12www.beuth.deDocument comprises 9 pagesIn case of doubt, the German-language original should be consulted as the aut
3、horitative text.Translation by DIN-Sprachendienst.DIN 7968:2007-07 2 Foreword This standard has been prepared by the Normenausschuss Mechanische Verbindungselemente (Fasteners Standards Committee), Technical Committee NA 067-03-04 AA Schraubenverbindungen fr den Stahlbau. The DIN 4000-160-7 tabular
4、layout of article characteristics shall apply to fit bolts covered in this standard. Amendments This standard differs from DIN 7968:1999-12 as follows: a) The tolerance class for the diameter of the unthreaded shank (ds) has been changed from h11 to b11. b) Thread length, b, and thread run-out have
5、been amended. c) Length tolerance js 17 has been included. d) Shank lengths and grip lengths have been amended. e) Use of intermediate elements besides washers complying with DIN 7989-1 is now also permitted. f) Some nominal lengths have been deleted. Previous editions DIN 7968: 1955-07, 1956-10, 19
6、63-03, 1971-01, 1989-10, 1999-12 1 Scope This standard specifies dimensions and technical delivery conditions for M12 to M30 hexagon fit bolts of product grade C for use in structural steel bolting. It also specifies the nuts and washers to be used. Fit bolts complying with this standard are also su
7、itable for use in aluminium structures and in composite construction. 2 Normative references The following reference documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced do
8、cument (including any amendments) applies. DIN 13-20, General purpose ISO metric screw threads Part 20: Limits of size for 1 mm to 68 mm diameter coarse pitch threads with recommended tolerance classes DIN 4000-160, Tabular layout of product properties Part 160: Fasteners with external thread DIN 79
9、89-1, Washers for use in structural steelwork Part 1: Product grade C DIN 7989-2, Washers for use in structural steelwork Part 2: Product grade A DIN EN 20898-2, Mechanical properties of fasteners Part 2: Nuts with specified proof load values; coarse thread DIN 7968:2007-07 3 DIN EN ISO 898-1, Mecha
10、nical properties of fasteners made of carbon steel and alloy steel Part 1: Bolts, screws and studs DIN EN ISO 3269, Fasteners Acceptance inspection DIN EN ISO 4032, Hexagon nuts, style 1 Product grades A and B DIN EN ISO 4034, Hexagon nuts Product grade C DIN EN ISO 4753, Fasteners Ends of parts wit
11、h external ISO metric screw thread DIN EN ISO 4759-1, Tolerances for fasteners Part 1: Bolts, screws, studs and fit bolts Product grades A, B and C DIN EN ISO 10684, Fasteners Hot dip galvanized coatings DIN ISO 286-1, ISO system of limits and fits Bases of tolerances, deviations and fits DIN ISO 96
12、5-4, ISO general purpose metric screw threads Tolerances Part 4: Limits of sizes for hot-dip galvanized external screw threads to mate with internal screw threads tapped with tolerance position H or G after galvanizing DIN ISO 965-5, ISO general purpose metric screw threads Tolerances Part 5: Limits
13、 of sizes for internal screw threads to mate with hot-dip galvanized external screw threads with maximum size of tolerance position h before galvanizing DIN ISO 8992, Fasteners General requirements for bolts, screws, studs and nuts DIN 7968:2007-07 4 3 Dimensions Bolt dimensions shall be as given in
14、 Figure 1 and Table 1. Dimensions in millimetres Key 1 Hexagon nut as in DIN EN ISO 4032 or DIN EN ISO 4034 aEnd chamfered (CH) as in DIN EN ISO 4753. bLength of incomplete thread, u 2 P. cDatum line for dw. Figure 1 Bolt dimensions (notation) All dimensions shall apply to bolts in the as-processed
15、condition (i.e. before a surface finish is applied). DIN 7968:2007-07 5 Table 1 Bolt dimensions Dimensions in millimetresThread size (d) M12 M16 M20 M24 M27 M30 Pa1,75 2 2,5 3 3 3,5 b (auxiliary dimension) 20,5 24,5 28,5 33 35,5 38,5 c max. 0,6 0,8 0,8 0,8 0,8 0,8 damax. 14,7 18,7 24,4 28,4 32,4 35,
16、4 Nominal size 13 17 21 25 28 31 dsbmin. 12,74 16,74 20,71 24,71 27,71 30,67 max. 12,85 16,85 20,84 24,84 27,84 30,83 dwmin. 16,4 22 27,7 33,2 38 42,7 e min. 19,85 26,17 32,95 39,55 45,2 50,85 Nominal size 8 10 13 15 17 19 min. 7,55 9,25 12,1 14,1 16,1 17,95 k max. 8,45 10,75 13,9 15,9 17,9 20,05 kw
17、min. 5,28 6,47 8,47 9,87 11,27 12,56 r min. 0,6 0,6 0,8 0,8 1 1 max. = nominal size 18 24 30 36 41 46 s min. 17,57 23,16 29,16 35 40 45 y max. 6,5 7,5 8,5 10 10 11,5 l Lengths lgcand lsdNominal size min. max. lsmin. lgmax. lsmin. lgmax. lsmin. lgmax. lsmin. lgmax. lsmin. lgmax. lsmin. lgmax. 35 33,7
18、5 36,25 8 14,5 40 38,75 41,25 13 19,5 8 15,5 45 43,75 46,25 18 24,5 13 20,5 8 16,5 50 48,75 51,25 23 29,5 18 25,5 13 21,5 55 53,5 56,5 28 34,5 23 30,5 18 26,5 12 22 60 58,5 61,5 33 39,5 28 35,5 23 31,5 17 27 14,5 24,5 65 63,5 66,5 38 44,5 33 40,5 28 36,5 22 32 19,5 29,5 15 26,570 68,5 71,5 43 49,5 3
19、8 45,5 33 41,5 27 37 24,5 34,5 20 31,575 73,5 76,5 48 54,5 43 50,5 38 46,5 32 42 29,5 39,5 25 36,580 78,5 81,5 53 59,5 48 55,5 43 51,5 37 47 34,5 44,5 30 41,585 83,25 86,75 58 64,5 53 60,5 48 56,5 42 52 39,5 49,5 35 46,590 88,25 91,75 63 69,5 58 65,5 53 61,5 47 57 44,5 54,5 40 51,595 93,25 96,75 68
20、74,5 63 70,5 58 66,5 52 62 49,5 59,5 45 56,5100 98,25 101,75 73 79,5 68 75,5 63 71,5 57 67 54,5 64,5 50 61,5105 103,25 106,75 78 84,5 73 80,5 68 76,5 62 72 59,5 69,5 55 66,5110 108,25 111,75 83 89,5 78 85,5 73 81,5 67 77 64,5 74,5 60 71,5115 113,25 116,75 88 94,5 83 90,5 78 86,5 72 82 69,5 79,5 65 7
21、6,5120 118,25 121,75 93 99,5 88 95,5 83 91,5 77 87 74,5 84,5 70 81,5125 123 127 93 100,5 88 96,5 82 92 79,5 89,5 75 86,5130 128 132 98 105,5 93 101,5 87 97 84,5 94,5 80 91,5135 133 137 103 110,5 98 106,5 92 102 89,5 99,5 85 96,5140 138 142 108 115,5 103 111,5 97 107 94,5 104,5 90 101,5145 143 147 11
22、3 120,5 108 116,5 102 112 99,5 109,5 95 106,5150 148 152 118 125,5 113 121,5 107 117 104,5 114,5 100 111,5155 153 157 118 126,5 112 122 109,5 119,5 105 116,5160 158 162 123 131,5 117 127 114,5 124,5 110 121,5165 163 167 128 136,5 122 132 119,5 129,5 115 126,5DIN 7968:2007-07 6 Table 1 (continued) Th
23、read size (d) M12 M16 M20 M24 M27 M30 l Lengths lgcand lsdsize min. max. lsmin. lgmax. lsmin. lgmax. lsmin. lgmax. lsmin. lgmax. lsmin. lgmax. lsmin. lgmax. 170 168 172 133 141,5 127 137 124,5 134,5 120 131,5 175 173 177 138 146,5 132 142 129,5 139,5 125 136,5 180 178 182 143 151,5 137 147 134,5 144
24、,5 130 141,5 185 182,7 187,3 142 152 139,5 149,5 135 146,5 190 187,7 192,3 147 157 144,5 154,5 140 151,5 195 192,7 197,3 152 162 149,5 159,5 145 156,5 200 197,7 202,3 157 167 154,5 164,5 150 161,5 aP = pitch of thread. bTolerance class b11 as in DIN ISO 286-1. clg max.= lnominal size b dls min.= lg
25、max. ymax.4 Technical delivery conditions See Table 2. Table 2 Technical delivery conditions and reference standards Material Steel General requirements DIN ISO 8992 Tolerance class 6az/6H 8g/7H Thread Standards DIN ISO 965-4, DIN ISO 965-5, DIN 13-20 Property class 5.6 / 5-2aMechanical properties S
26、tandards DIN EN ISO 898-1, DIN EN 20898-2 Product grade CbLimit deviations and geometrical tolerances Standard DIN EN ISO 4759-1 Surface finish Hot dip galvanized as in DIN EN ISO 10684 Other finishes or as processed Acceptance inspection DIN EN ISO 3269 shall apply with regard to acceptance inspect
27、ion. aThe addition of “-2” to the property class indicates that the use of nuts made from free-cutting steel or Thomas steel is excluded. bFor nominal lengths l 150 mm, length tolerance js 17 shall apply. 5 Designation EXAMPLE Designation of an M20 hexagon fit bolt for use in structural steel boltin
28、g, with a nominal length l = 100 mm, of property class 5.6, hot dip galvanized, for supply with a hexagon nut (Mu)1)of property class 5-2: Fit bolt DIN 7968 M20 100 Mu 5.6 tZn 1) Where bolts are supplied ready-packaged in given quantities, the nuts complying with DIN EN ISO 4032 or DIN EN ISO 4034 s
29、hall accompany the consignment in a separate pack. Nominal DIN 7968:2007-07 7 6 Marking Fit bolts shall be marked in accordance with DIN EN ISO 898-1 and with the DIN number (DIN 7968). 7 Mass The values given in Table 3 are for guidance only. Table 3 Mass Thread size (d) M12 M16 M20 M24 M27 M30 Len
30、gth, l in mm Mass of bolt + nut (7,85 kg/dm3) in kg/1 000 units 35 63,6 40 68,6 137 45 74 146 255 50 79,2 155 269 55 84,4 164 283 437 60 89,6 173 297 456 621 65 94,8 182 311 475 645 848 70 100 191 325 494 669 878 75 105 200 339 513 693 908 80 110 209 353 532 717 938 85 115 218 367 551 741 968 90 120
31、 227 381 570 765 998 95 125 236 395 589 789 1028 100 130 245 409 608 813 1058 105 135 254 423 627 837 1088 110 140 263 437 646 861 1118 115 145 272 451 665 885 1148 120 150 281 465 684 909 1178 125 290 479 703 933 1208 130 299 493 722 957 1238 135 308 507 741 981 1268 140 317 521 760 1005 1298 145 3
32、26 535 779 1029 1328 150 335 549 798 1053 1358 155 563 817 1077 1388 160 577 836 1101 1418 165 591 855 1125 1448 170 605 874 1149 1478 175 619 893 1173 1508 180 633 912 1197 1538 185 931 1221 156190 950 1245 1598 195 969 1269 162200 988 1293 1658 Mass of nut, in kg/1 000 units 15,3 36,5 69,3 119 170
33、 234 DIN 7968:2007-07 8 8 Grip length Table 4 specifies requirements for the grip length of hexagon fit bolt/nut assemblies which are to be met by the manufacturer and which serve the user as a guide for selecting a suitable nominal length. In assemblies where the grip length is as specified in Tabl
34、e 4 but the washer as in DIN 7989-1 is replaced by other intermediate elements, the latter shall have a total thickness equal to that of the washer. Washers complying with DIN 7989-2 may be used without restriction. NOTE Where fit bolts are to be assembled with nuts conforming to DIN EN ISO 4034 and
35、 the grip length is as specified in Table 4, it may be necessary to further reduce the bolt length within the specified tolerance in order to ensure a minimum end protrusion of 1 P (see Figure 2). Use of assemblies with grip lengths deviating from this standard is permitted if the requirements speci
36、fied in the relevant standards are fulfilled. Dimensions in millimetres Key lkGrip length 1 Washer as in DIN 7989-1 2 Hexagon nut as in DIN EN ISO 4032 or DIN EN ISO 4034 (optional) Figure 2 Grip length DIN 7968:2007-07 9 Table 4 Grip lengths Dimensions in millimetresThread size (d) M12 M16 M20 M24
37、M27 M30 Grip length lkaLength, l min. max. min. max. min. max. min. max. min. max. min. max. 35 9,5 14,5 40 14,5 19,5 10,5 15,5 45 19,5 24,5 15,5 20,5 12 17 50 24,5 29,5 20,5 25,5 17 22 55 29,5 34,5 25,5 30,5 22 27 18 23 60 34,5 39,5 30,5 35,5 27 32 23 28 20,5 25,5 65 39,5 44,5 35,5 40,5 32 37 28 33
38、 25,5 30,5 23 28 70 44,5 49,5 40,5 45,5 37 42 33 38 30,5 35,5 28 33 75 49,5 54,5 45,5 50,5 42 47 38 43 35,5 40,5 33 38 80 54,5 59,5 50,5 55,5 47 52 43 48 40,5 45,5 38 43 85 59,5 64,5 55,5 60,5 52 57 48 53 45,5 50,5 43 48 90 64,5 69,5 60,5 65,5 57 62 53 58 50,5 55,5 48 53 95 69,5 74,5 65,5 70,5 62 67
39、 58 63 55,5 60,5 53 58 100 74,5 79,5 70,5 75,5 67 72 63 68 60,5 65,5 58 63 105 79,5 84,5 75,5 80,5 72 77 68 73 65,5 70,5 63 68 110 84,5 89,5 80,5 85,5 77 82 73 78 70,5 75,5 68 73 115 89,5 94,5 85,5 90,5 82 87 78 83 75,5 80,5 73 78 120 94,5 99,5 90,5 95,5 87 92 83 88 80,5 85,5 78 83 125 95,5 100,5 92
40、 97 88 93 85,5 90,5 83 88 130 100,5 105,5 97 102 93 98 90,5 95,5 88 93 135 105,5 110,5 102 107 98 103 95,5 100,5 93 98 140 110,5 115,5 107 112 103 108 100,5 105,5 98 103 145 115,5 120,5 112 117 108 113 105,5 110,5 103 108 150 120,5 125,5 117 122 113 118 110,5 115,5 108 113 155 122 127 118 123 115,5
41、120,5 113 118 160 127 132 123 128 120,5 125,5 118 123 165 132 137 128 133 125,5 130,5 123 128 170 137 142 133 138 130,5 135,5 128 133 175 142 147 138 143 135,5 140,5 133 138 180 147 152 143 148 140,5 145,5 138 143 185 148 153 145,5 150,5 143 148 190 153 158 150,5 155,5 148 153 195 158 163 155,5 160,5 153 158 200 163 168 160,5 165,5 158 163 alk min= lg max+ 1 P hmin(with hminas in DIN 7989-1) lk max= lnom 1 P mmax hnom(with mmaxas in DIN EN ISO 4032 and hnomas in DIN 7989-1)
