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Crosslink International, Inc. is ISO 9000 Certified by KEMA

Bolt Torque Specification

Coarse Thread Series (Metric Units)   (print PDF)

CLASS 4.6 CLASS 5.8 CLASS 9.8 CLASS 10.9
Thread
Size & Pitch
Clamp Load (KN) Tightening Torque
(N*m)
Clamp Load (KN) Tightening Torque
(N*m)
Clamp Load (KN) Tightening Torque
(N*m)
Clamp Load (KN) Tightening Torque
(N*m)
M6 x 1 3.41 4.09 5.73 6.87 9.80 11.76 12.5 15
M7 x 1 4.90 6.86 8.24 11.5 14.1 19.72 18.0 25
M8 x 1.25 6.20 9.93 10.4 16.7 17.8 28.55 22.8 36
M10 x 1.5 9.8 19.7 16.5 33.1 28.3 56.55 36.1 72
M12 x 1.75 14.3 34.3 24.0 57.7 41.1 98.63 52.5 126
M14 x 2 19.5 54.6 32.8 91.8 56.1 157 71.6 200
M16 x 2 26.6 85.2 44.7 143 76.5 245 97.7 313
M18 x 2.5 32.5 117 54.7 197 93.6 337 120 430
M20 x 2.5 41.5 166 69.8 279 119 478 153 610
M22 x 2.5 51.4 226 86.4 380 148 650 189 830
M24 x 3 59.8 287 101 483 172 826 220 1055
M27 x 3 77.8 420 131 706 224 1208 286 1543
M30 x 3.5 95.1 571 160 959 273 1641 349 2095
M33 x 3.5 118 776 198 1305 338 2233 432 2851
M36 x 4 138 997 233 1676 398 2868 509 3662
M39 x 4 165 1290 278 2170 476 3711 608 4739

 

Fine Thread Series (Metric Units)   (print PDF)

CLASS 4.6 CLASS 5.8 CLASS 9.8 CLASS 10.9
Thread Size & Pitch Clamp Load (KN) Tightening Torque
(N*m)
Clamp Load (KN) Tightening Torque
(N*m)
Clamp Load (KN) Tightening Torque
(N*m)
Clamp Load (KN) Tightening Torque
(N*m)
M8 x 1 6.64 10.6 11.2 17.9 19.1 30.6 24.4 39.0
M10 x 1.25 10.4 20.7 17.4 34.9 29.8 59.7 38.1 76.2
M12 x 1.25 15.6 37.5 26.2 63.0 44.9 108 57.3 138
M14 x 1.5 21.2 59.3 35.6 100 60.9 171 77.8 218
M16 x 1.5 28.3 90.6 47.6 152 81.4 261 104 333
M18 x 1.5 36.6 132 61.6 222 105 379 134 484
M20 x 1.5 46.1 184 77.5 310 133 530 169 677
M22 x 1.5 56.4 248 94.9 418 162 714 207 912
M24 x 2 65.1 312 109 525 187 899 239 1147
M27 x 2 84.1 454 141 763 242 1306 309 1667
M30 x 2 105 632 177 1062 303 1816 387 2319
M33 x 2 129 851 217 1431 371 2449 474 3127
M36 x 3 147 1056 247 1775 422 3036 538 3877
M39 x 3 175 1362 294 2290 502 3917 641 5001

The values presented in these tables are representative and have been compiled for the user's benefit. Results can be influenced by any number of variables including: 1) excessive lubrication; 2) excessive design clamp load; 3) nicked or binding threads; 4) non-parallel mating surfaces; and 5) inadequate torque control, to name a few. Therefore; C-I, Inc. expressly disclaims liability of any kind associated with the approach of the data shown herein.

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