Metric Thread - Bolt Torque Chart

 

Tightening torque is the force used to tighten the screw connection during assembly using a tool. This torque is transmitted to the metric screw or nut using an adjustable, suitable torque wrench. Please refer to the lower torque table for the corresponding values of the various bolt sizes and strength classes.

 

5.6 Strehngth class - Aluminium screws

6.8 Strehngth class - V2A screws

8.8 Strehngth class - Titanium screws

 

Bolt Torque Chart Metric

 

Recommended Bolt torque metric thread

torque in (Nm) 

Metric Thread size

Strength class

4.6 5.6 6.8 8.8 10.9 12.9
 M2 0,13 0,16 0,26 0,35 0,49 0,59
M2,5 0,27 0,34 0,54 0,72 1,01 1,21
M3 0,48 0,60 0,96 1,28 1,80 2,16
M4 1,12 1,39 2,23 2,97 4,18 5,02
M5

2,26

2,83 4,52 6,03 8,48 10,18
M6 3,84 4,80 7,69 10,25 14,41 17,29
M7 5,13 6,42 10,27 13,70 19,25 23,10
M8 9,35 11,69  18,70 24,93 35,06 42,07
M10 18 23 37 49 70 83
M12 32 40 65 86 121 146
M14 52 65  104 138 194 233
M16 81 101  161 215 302 363
M18  112 139  222 296 417 500
M20  157 197  315 420 590 709
M22  215 269  430 574 807 968
M24  272 340  544 726 1020 1224
M27  400 500  800 1067 1500 1800
M30  542 677 1083 1445 2032 2438
M33  739 923 1477 1969 2770 3323
M36  948  1185 1896 2528 3555 4266
M39 1229  1536 2457 3276 4607 5529
M42 1519  1899 3038 4050 5696 6835
M45 1898  2373 3796 5062 7118 8541
M48 2282  2853 4565 6086 8559 10271
M52 2954  3692 5907 7876 11076 13292
M56 3672  4591 7345 9793 13772 16526
M60 4582  5728 9164 12219 17183 20619
M64 5536  6920 11071 14762 20759 24911
M68 6720  8400 13440 17919 25199  30239

* All information without guarantee.


Strength classes of screws

 

Screws are marked with different strength classes so that it is very easy to determine the tensile strength (Rm) and the yield strength (Re).

 

Example: Tensile strength class 5.6

 

1. Determination of Rm:

Multiply the first number by 100 to obtain the tensile strength (Rm).

=> Rm = 5 x 100 = 500 N/mm²

 

2. Determination of Re:

The first number is multiplied by the second number and the result is

multiplied by 10 gives the yield strength (Re).

=> Re = ( 5 x 6 ) x 10 = 300 N/mm²

 

   Strength classes of screws
4.6 5.6 6.8 8.8 10.9 12.9
Tensile strength (Rm) 400 500 600 800 1000 1200
Mating limit (Re) 240 300 480 640 900 1080

* All information without guarantee.


Preload forces for screw connections

 

In a screw connection, two or more parts are joined together. The preload force is the force exerted by a screw or screw connection on the components. If the preload force is high enough and the screw connection is selected correctly, the screwed parts behave like one part and are therefore firmly connected.

 

Preload forces for regular threads

 

Preload force Table for regular threads

Preload force in (N)

Thread size

Strength classes

4.6 5.6 6.8 8.8 10.9 12.9
 M2 338 422 675 901 1267 1520
M2,5 563 703 1125 1500 2110 2532
M3 845 1056 1689 2253 3168 3801
M4 1463 1829 2927 3902 5487 6585
M5 2395 2994 4790 6387 8982 10778
M6 3379 4224 6758 9011 12671 15205
M8 6202 7753 12404 16539 23258 27909
M10 9876 12345 19752 26336 37034 44441
M12 14400 18000 28801 38401 54001 64801
M14 19775 24719 39551 52734 74158 88989
M16 27221 34027 54443 72591 102080 122497
M18 33078 41347 66155 88207 124041 148850
M20 42534 53167 85067 113423 159501 191401
M22 53175 66469 106350 141800 199406 239288
M24 61248 76560 122497 163329 229681 275617
M27 80670 100837 161339 215119 302512 363014
M30 98027 122533 196054 261405 367600 441120
M33 122241 152801 244482 325976 458404 550084
M36 143413 179266 286826 382434 537798 645358
M39 172420 215525 344839 459786 646574 775888
M42 197407 246758 394813 526417 740275 888329
M45 231206 289007 462412 616549 867022  1040426
M48 280008 325010 520015 693354 975029 1170035
M52 312056 390070 624112 832149 1170209 1404251
M56 359643 449804 719689 959581 1349411 1619293
M60 420651 525813 841301 1121735 1577440 1892928
M64 475860 594825 951720 1268960 1784476 2141371
M68 545427 681784 1090855 1454473 2045353 2454423

* All information without guarantee.

Tip !

Torque wrench 0,8 - 5,0 Nm

     

Torque wrench 6 - 210 Nm