Page 684 - Mastik®

Approximate values for property Preload and
classes 3.6 to 12.9 tightening torques

Torque values are based on VDI 2230, values are applicable for other types of screws acc. ISO 273-medium. The listed
edition 2003 externally threaded fasteners also, as values are maximum values and do not
The table lists maximum permissible long as head strength and bearing ar- include a safety factor. This guideline
tightening torques and the resulting eas are equivalent. The values are based assumes that the user has adequate fas-
maximum preload for hex cap screws on 90% utilization of the bolt’s yield tener knowledge and is able to interpret
and socket cap screws. Torque/preload strength. Clearance holes for bolts and the data accordingly.
Maximum preload FM max. [N] Maximum tightening torque MA max. [Ncm]
Friction
Property class based on ISO 898 / 1 Property class based on ISO 898 / 1
Threads coeff. Conversion
5.6 5.6 factor X
μ K = μ G
3.6 4.6 (4.8) 6.8 8.8 10.9 12.9 3.6 4.6 (4.8) 6.8 8.8 10.9 12.9
M 1,6 0.10 176 235 294 470 627 882 1058 4.2 5.7 7.1 11.3 15.1 21.2 25.5 0.024
0.12 171 228 285 455 607 854 1025 4.7 6.3 7.9 12.6 16.9 23.7 28.5 0.028
0.14 165 220 275 441 588 826 992 5.2 6.9 8.7 13.9 18.5 26 31.2 0.032
M 2 0.10 292 390 487 779 1039 1461 1754 9 11.9 14.9 23.8 31.7 44.5 53.5 0.031
0.12 283 378 472 756 1008 1417 1701 10 13.3 16.7 26.7 35.6 50 60 0.035
0.14 274 366 457 732 976 1373 1647 11 14.7 18.4 29.4 39.2 55 66 0.040
M 2,5 0.10 485 647 809 1294 1725 2426 2911 18 24 30 49 65 91 109 0.037
0.12 471 628 785 1257 1676 2356 2828 21 27 34 55 73 103 123 0.044
0.14 457 609 762 1219 1625 2285 2742 23 30 38 60 81 113 136 0.050
M 3 0.10 726 968 1210 1936 2582 3631 4357 32 42 53 84 112 158 190 0.044
0.12 706 941 1177 1883 2510 3530 4236 36 48 60 95 127 179 214 0.051
0.14 685 914 1142 1827 2436 3426 4111 40 53 66 105 141 198 237 0.058
Maximum preload FM max. [kN] Maximum tightening torque MA max. [Ncm]
M 4 0.10 1.26 1.68 2.10 3.36 4.5 6.7 7.8 0.73 0.97 1.21 1.94 2.6 3.9 4.5 0.58
0.12 1.22 1.63 2.04 3.26 4.4 6.5 7.6 0.82 1.09 1.37 2.19 3.0 4.6 5.1 0.67
0.14 1.19 1.58 1.98 3.17 4.3 6.3 7.4 0.91 1.21 1.51 2.42 3.3 4.8 5.6 0.76
M 5 0.10 2.06 2.74 3.43 5.48 7.4 10.8 12.7 1.4 1.9 2.4 3.8 5.2 7.6 8.9 0.70
0.12 2.00 2.67 3.33 5.33 7.2 10.6 12.4 1.6 2.2 2.7 4.3 5.9 8.6 10.0 0.81
0.14 1.94 2.59 3.23 5.18 7.0 10.3 12.0 1.8 2.4 3.0 4.8 6.5 9.5 11.2 0.93
M 6 0.10 2.90 3.87 4.84 7.74 10.4 15.3 17.9 2.5 3.3 4.1 6.6 9.0 13.2 15.4 0.86
0.12 2.82 3.76 4.71 7.53 10.2 14.9 17.5 2.8 3.7 4.7 7.5 10.1 14.9 17.4 0.99
0.14 2.74 3.65 4.57 7.31 9.9 14.5 17.0 3.1 4.1 5.2 8.3 11.3 16.5 19.3 1.14
M 8 0.10 5.3 7.1 8.8 14.2 19.1 28.0 32.8 6.0 8.0 10.0 16.1 21.6 31.8 37.2 1.13
0.12 5.15 6.9 8.6 13.8 18.6 27.3 32.0 6.8 9.1 11.3 18.2 24.6 36.1 42.2 1.32
0.14 5.0 6.7 8.3 13.4 18.1 26.6 31.1 7.5 10.1 12.6 20.1 27.3 40.1 46.9 1.51
M10 0.10 8.4 11.3 14.1 22.5 30.3 44.5 52.1 12 16.1 20.1 32.3 43 63 73 1.42
0.12 8.2 11.0 13.7 21.9 29.6 43.4 50.8 13.7 18.3 22.9 36.5 48 71 83 1.65
0.14 8.0 10.7 13.3 21.3 28.8 42.2 49.4 15.2 20.3 25.3 40.6 54 79 93 1.89
M12 0.10 12.3 16.4 20.5 32.8 44.1 64.8 75.9 20 27 34 55 73 108 126 1.65
0.12 12.0 16.0 20.0 32.0 43.0 63.2 74.0 23 31 39 62 84 123 144 1.94
0.14 11.6 15.5 19.4 31.1 41.9 61.5 72.0 26 34 43 69 93 137 160 2.22
M14 0.10 16.9 22.5 28.2 45.1 60.6 88.9 104.1 33 44 55 88 117 172 201 1.94
0.12 16.5 21.9 27.4 43.9 59.1 86.7 101.5 37 50 62 100 133 195 229 2.26
0.14 16.0 21.3 26.7 42.7 57.5 84.4 98.9 41 55 69 111 148 218 255 2.58
M16 0.10 23.2 30.9 38.6 61.8 82.9 121.7 142.4 50 67 84 134 180 264 309 2.17
0.12 22.6 30.1 37.6 60.2 80.9 118.8 139,0 57 76 96 153 206 302 354 2.54
0.14 22.0 29.3 36.6 58.6 78.8 115.7 135.4 64 85 107 171 230 338 395 2.92
M18 0.10 28.2 37.7 47.1 75.3 104 149 174 70 93 117 187 259 369 432 2.48
0.12 27.5 36.7 45.8 73.4 102 145 170 80 106 133 212 295 421 492 2.90
0.14 26.7 35.7 44.6 71.3 99 141 165 89 118 148 236 329 469 549 3.32
M20 0.10 36.2 48.3 60.3 96.5 134 190 223 98 131 164 262 363 517 605 2.71
0.12 35.3 47.0 58.8 94.1 130 186 217 112 150 187 300 415 592 692 3.18
0.14 34.3 45.8 57.2 91.6 127 181 212 125 167 209 334 464 661 773 3.65
M22 0.10 45.1 60.1 75.2 120.3 166 237 277 132 176 220 353 495 704 824 2.95
0.12 44.0 58.7 73.4 117.4 162 231 271 151 202 252 403 567 807 945 3.46
0.14 42.9 57.1 71.4 114.3 158 225 264 169 225 282 451 634 904 1057 3.97
M24 0.10 52.1 69.5 86.9 139.0 192 274 320 169 226 282 451 625 890 1041 3.25
0.12 50.8 67.7 84.7 135.5 188 267 313 193 257 322 515 714 1017 1190 3.80
0.14 49.4 65.9 82.4 131.8 183 260 305 215 287 359 574 798 1136 1329 4.36
M27 0.10 68.4 91.2 114.0 182.4 252 359 420 248 331 414 662 915 1304 1526 3.63
0.12 66.7 89.0 111.2 178.0 246 351 410 284 379 474 759 1050 1496 1750 4.26
0.14 65.0 86.7 108.3 173.3 240 342 400 318 424 530 848 1176 1674 1959 4.89
M30 0.10 83.2 111.0 138.7 222.0 307 437 511 338 450 563 901 1246 1775 2077 4.06
0.12 81.2 108.3 135.3 216.5 300 427 499 386 515 644 1031 1420 2033 2380 4.76
0.14 79.0 105.3 131.7 210.8 292 416 487 431 575 719 1151 1597 2274 2662 5.46
M33 0.10 103.5 138.0 172.5 276.0 381 543 635 456 608 760 1216 1679 2392 2799 4.41
0.12 101.0 134.7 168.4 269.4 373 531 621 523 697 871 1395 1928 2747 3214 5.17
0.14 98.4 131.2 164.0 262.5 363 517 605 585 780 975 1560 2161 3078 3601 5.95
M36 0.10 121.6 162.1 202.7 324.3 448 638 747 587 783 979 1566 2164 3082 3607 4.83
0.12 118.7 158.2 197.8 316.4 438 623 729 672 897 1121 1793 2482 3535 4136 5.67
0.14 115.6 154.1 192.6 308.1 427 608 711 752 1002 1253 2005 2778 3957 4631 6.51
M39 0.10 145.9 194.5 243.1 389.0 537 765 895 758 1011 1264 2022 2791 3975 4652 5.20
0.12 142.4 189.9 237.4 379.8 525 748 875 870 1160 1450 2321 3208 4569 5346 6.11
0.14 138.8 185.0 231.3 370.0 512 729 853 974 1299 1624 2598 3597 5123 5994 7.02
With MA = FM · X, the tightening torque
Reference value:
can be calculated for other preloads (as- The reference values are slightly higher than VDI 2230, 1986 edition. The
suming the same friction coefficient and higher value allows a better utilization of the screws strength. Friction coef- Torque / Preload
calculation per
same thread size). ficient values are found on page T.039. As a result of new technologies
and more research into friction, there are now many more different fric- VDI 2230:2003 are
tion values available. See page T.039. How to interpret torque charts in highly recommended!
this catalog.