EIT Tools Professional

 

Manual torque multipliers Electric Torque Wrenches Cordless Torque Wrenches Pneumatic Hydraulic Pneumatic Nutrunner, dust shrouds, torque control impact wrenches, digital torque tester

You are here:


Torque chart - recommended values - indicative only

Bolt size

Grade

3.6

4.6

4.8

5.6

5.8

6.8

8.8 10.9 12.9
M

Width
across
flats
mm

Torque
Nm
Torque
Nm
Torque
Nm
Torque
Nm
Torque
Nm
Torque
Nm
Torque
Nm
Torque
Nm
Torque
Nm
M 4 7 0.85 1.1 1.5 1.4 1.9 2.3 2.9 4.1 4.9
M 5 9 1.7 2.2 3.0 2.8 3.7 4.5 6.0 8.5 10
M 6
10
2.9 3.8 5.1 4.8 6.4 7.7 10 14 17
M 8 13 7.0 9.3 12 12 16 19 25 35 41
M 10
17
14 19 25 23 31 37 49 69 83
M 12 19 24 32 43 40 54 65 86 120 145
M 14
22
39 51 68 64 86 105 135 190 230
M 16 24 59 79 105 98 130 155 210 295 355
M 18
27
81 110 145 135 180 215 290 405 485
M 20 30 115 155 205 190 255 305 410 580 690
M 22
32
155 205 275 260 345 415 550 780 930
M 24 36 200 265 350 330 440 530 710 1000 1200
M 27
41
295 390 520 490 650 780 1050 1500 1800
M 30 46 395 530 710 660 880 1050 1450 2000 2400
M 33
50
540 720 960 900 1200 1450 1900 2700 3250
M 36 55 690 920 1250 1150 1550 1850 2450 3450 4150
M 39
60
920 1200 1600 1500 2000 2400 3200 4500 5400
M 42 65 1100 1500 1950 1850 2450 2950 3950 5550 6650
M 45
70
1400 1850 2450 2300 3100 3700 4950 6950 8350
M 48 75 1700 2250 3000 2800 3750 4450 5950 8400 10100
M 52
80
2150 2900 3850 3600 1800 5750 7650 10800 12900
M 56 85 2700 3600 4800 4500 5950 7150 9550 13400 16100
M 60
90
3350 4450 5950 5550 7400 8900 11900 16700 20000
M 64 95 4000 5350 7150 6700 8950 10700 14300 20100 24100
M 68
100
4850 6500 8650 8100 10800 13000 17300 24300 29100
M 72 *
105
            21945 31256 36574
M 76 *
110
            25953 36984 43269
M 80 *
115
            30437 43347 50737
M 90 *
130
            44214 62970 73690
M 100 *
145
            61462 87527 102431
M 110 *
155
            81845 116567 136408
M 120 *
175
            108448 154443 180712
M 125 *
180
            124327 177099 207233
M 130 *
185
            139572 198770 232620
M 140 *
200
            175561 250056 292817
M 150 *
215
            216875 308960 361484
Recommended max. tightening torque in Nm for untreated oil-smeared screws.
Friction coefficient µ= 0.125, torque corresponds to approx. 62% of tensile bolt stress.
* Friction coefficient µ= 0.14, torque corresponds to approx. 90% of tensile bolt stress.
Every bolted joint is unique and the optimum tightening torque should be determined for each application by careful examination. A properly tightened bolt is one that is stretched such that it acts like a very ridged spring pulling mating surfaces together. The rotation of a bolt (torque) at some point causes it to stretch (tension).

Several factors affect how much tension occurs when a given amount of tightening torque is applied.

  • The first factor is the bolt's diameter.
  • The second factor is the bolts grade. It takes more force to stretch an SAE grade 8 bolt (or a 12.9 quality bolt) than it does to stretch an SAE grade 5 bolt (or a 8.8 quality bolt) because of the greater material strenght.
  • The third factor indicates that harder, smoother and/or slicker bolting surfaces, such as threads and bearing surfaces, require less rotational force (torque) to stretch (tension) a bolt than do softer, rougher, and stickier surfaces.

The basic formula T = K x D x P takes these factors into account and provided users with a starting point for establishing an initial target tightening torque:

T = target tighten torque (result in this formula is inch pounds, dividing by 12 yields foot pounds)
K = coefficient of friction (nut factor) always an estimation in this formula *
D = Bolts nominal diameter in inches
P = Bolts desired tensible load in pounds (generally 75% of yield strength)

The reason all applications should be evaluated to determine the optimum tightening torque is that the K factor in this formula is always an estimate. The most commonly used bolting factors K are 0.20 for plain finished bolts, 0.22 for zinc plated bolts, and 0.10 for waxed or highly lubricated bolts.

Bolt Conditions can range from:
Lubricated: Moly Based 0.10 - 0.18, Nickel Based 0.10 - 0.12, Copper Based 0.08 - 0.23,
Plated: Cadmium 0.11 - 0.33, Zinc 0.08 - 0.53, Black Oxide 0.11 - 0.28,
As Received: Mild Alloy Steel on Steel 0.16 - 0.27

Example: 3/4"-10 Grade 5 zinc plated bolt
K = 0.22 (zinc plated)
D = 0.75 (3/4"-10 nominal diameter)
P = 23'046 pounds (Yield strength for SAE Grade 5 bolt = 69000 PSI * Tensile stress area 0.344 for 3/4"x10bolt)

T = 0.22 * 0.75 * 23046 Pounds / 12 = 317 ft.lb (317 ft.lb * 1.3558 = 430Nm)

In order to work out your specific required torque use the above formula using the values P = tensile load in pound which usually is 75% of yield strength and the tensile stress area for the specific bolt used).

back to top

Recommended bolt tension for shaft and stretch bolts at 90% of bolt yield strength - METRIC coarse threads
Bolt size

Nut size

Quality 8.8
tensile load 640 N/mm2
tensile stress 660 N/mm2
Quality 10.9
tensile load 900 N/mm2
tensile stress 940 N/mm2
Quality 12.9
tensile load 900 N/mm2
tensile stress 940 N/mm2
M
mm

Width
across
flats mm

Bolt tension for bolts with shaft
Hex drive
Bolt tension for stretch bolts
Bolt
Bolt tension for bolts with shaft
hex drive
Bolt tension for stretch bolts
bolt
Bolt tension for bolts with shaft
hex drive
Bolt tension for stretch bolts
bolt
M20x2.5 32 137.9 105.0 196.4 149.5 229.9 175.0
M24x3 36 199.2 151.2 283.8 215.3 332.0 251.9
M27x3
41
261.3 196.1 372.1 279.2 435.5 326.8
M30x3.5 46 319.1 246.8 454.5 351.5 531.9 411.3
M33x3.5
50
396.5 303.4 564.7 432.1 660.9 505.6
M36x4 55 467.1 352.8 665.3 502.5 778.5 588.0
M39x4
60
569.9 434.0 797.4 618.1 933.1 723.3
M42x4.5 65 643.2 492.8 916.0 701.8 1072.0 821.3
M45x4.5
70
751.3 587.9 1070.0 837.4 1252.2 979.9
M48x5 75 847.2 656.1 1206.6 934.4 1412.0 1093.4
M52x5
80
1013.7 784.2 1443.8 1116.9 1689.5 1307.1
M56x5.5 85 1170.9 903.2 1667.6 1286.4 1951.4 1505.3
M60x5.5
90
1403.0 1052.6 1998.3 1499.2 2338.4 1754.3
M64x6 95 1543.6 1213.4 2198.4 1728.2 2572.6 2022.4
M68x6 100 1814.9 1385.7 2584.8 1973.6 3024.8 2309.5
M72x6 105 2002.8 1596.6 2852.5 2273.9 3338.0 2661.0
M76x6 110 2310.3 1793.3 3290.4 2554.1 3850.5 2988.9
M80x6 115 2521.7 2032.2 3291.6 2894.3 4202.9 3387.0
M90x6 130 3254.4 2624.2 4635.0 3737.5 5424.0 4373.7
M100x6 145 4073.4 3291.8 5801.6 4688.3 6789.1 5486.4
M110x6 155 4992.0 3991.7 7109.8 5685.2 8319.9 6652.9
M120x6 175 6003.8 4853.7 8550.8 6912.9 10006.3 8089.6
M125x8 180 6311.3 5341.3 8988.9 7607.3 10518.9 8902.1
M130x8 185 7000.2 5800.0 9970.0 8260.6 11667.0 9666.6
M140x8 200 8044.2 6830.4 11456.9 9728.2 13407.0 11384.0
M150x8 215 9316.0 8006.1 13268.3 11402.6 15526.7 13343.4
These values are for guidance only. Always check with the bolt manufacturer !
back to top

Recommended maximum bolt loads - UNC threads
Bolt size

Nut size

Quality P

Quality S

Quality T
UNC
inch

Width
across
flats inch

Newtons N.m lfb lbf.ft Newtons N.m lfb lbf.ft Newtons N.m lfb lbf.ft
1/4" 7/16 4379 5.43 984 4.00 8320 10.3 1870 7.60 8980 11.1 2018 8.19
5/16" 1/2 7344 11.2 1650 8.26 13954 21.3 3136 15.71 15061 23.0 3385 16.96
3/8"
9/16
10951 19.9 2461 14.68 20807 37.9 5161 27.95 22458 40.9 5048 30.17
7/16" 5/8 15065 31.9 3386 23.53 28623 60.7 6434 44.77 30894 65.5 6945 48.31
1/2"
3/4
20244 48.8 4551 36.00 38463 92.7 8646 68.37 41516 100 9333 73.76
9/16" 7/8 26075 70.4 5861 51.92 49542 134 11137 98.83 53474 144 12021 106
5/8"
15/16
32452 97.4 7295 71.84 61658 185 13861 136.45 66552 200 14961 147.5
3/4" 1 1/8 49781 178 11191 131.3 94584 338 21263 249.3 102091 364 22950 268.5
7/8"
1 5/16
67157 279 15097 205.8 127599 530 28685 391 137725 572 30961 422
1" 1 1/2 88221 418 19832 308.3 167620 795 37682 586 180923 858 40673 633
1 1/8"
1 11/16
111007 593 24955 437.4 210913 1126 47415 830 227652 1216 51178 897
1 1/4" 1 7/8 142135 837 31953 617.3 270091 1591 60718 1173 291527 1717 65537 1266
1 3/8"
2 1/16
168641 1096 37911 808.4 320417 2083 72032 1536 345847 2248 77749 1658
1 1/2" 2 1/4 206578 1456 46440 1074 392498 2767 88237 2041 423648 2987 95239 2203
These torque values are for guidance only. Always check with the bolt manufacturer !
back to top

Recommended maximum bolt loads - UNF threads
Bolt size

Nut size

Quality P

Quality S

Quality T
UNF
inch

Width
across
flats inch

Newtons N.m lfb lbf.ft Newtons N.m lfb lbf.ft Newtons N.m lfb lbf.ft
1/4" 7/16 5232 6.28 1176 4.63 9941 11.9 2234 8.78 10730 12.9 2412 9.51
5/16" 1/2 8410 12.5 1891 9.22 15979 23.8 3592 17.55 17247 25.7 3877 18.96
3/8"
9/16
12911 22.7 2903 16.74 24531 43.2 5514 31.9 26478 46.6 5952 34.4
7/16" 5/8 17416 35.9 3915 26.5 33091 68.2 7439 50.3 35717 73.6 8029 54.3
1/2"
3/4
23685 55.4 5325 40.9 45002 105 10116 77.4 48574 114 10919 84.0
9/16" 7/8 30075 79.0 6761 58.3 57143 150 12846 111 61678 162 13865 119
5/8"
15/16
38156 111 8578 81.9 72496 210 16297 155 78250 227 17591 167
3/4" 1 1/8 56078 195 12607 144 106549 370 29353 273 115005 399 25854 294
7/8"
1 5/16
76297 309 17152 228 144965 587 32589 433 156470 634 35175 468
1" 1 1/2 99200 459 22301 339 188480 873 42371 644 203439 942 45734 695
1 1/8"
1 11/16
128738 667 28941 492 244602 1267 54988 934 264015 1368 59352 1009
1 1/4" 1 7/8 161358 925 36275 682 306580 1757 68921 1296 330911 1896 74391 1398
1 3/8"
2 1/16
199331 1252 44811 923 378728 2378 85141 1754 408786 2567 91898 1893
1 1/2" 2 1/4 240377 1642 54039 1211 456717 3119 102673 2300 492965 3367 110822 2482
These torque values are for guidance only. Always check with the bolt manufacturer !

Imperial to metric dimensions comparison chart

Lenght 1 in
=
0.0254 m
1 in
=
25.4 mm
1 m
=
39.3701 "
1 m
=
3.2808 ft
1 mm
=
0.0393701 "
Weight 1 lb
=

0.4536 kg

1 kg
=
2.2046 lb
Torque 1 kpm
=
9.8067 Nm
1 ft lb
=
1.3558 Nm
In lb
=
0.1130 Nm
1 Nm
=

0.7376 ft lb

Pressure 1 bar
=
100 kPa
1 kp/cm2 at
=
98.0665 kPa
1 psi
=
6.8948 kPa or 0.01 bar
1 kPa
=
0.0101972 kp/cm2 at
Power 1 kpm/s
=
9.8067 W
1 hp
=
0.7457 kW
1 kW
=
1.3410 hp
Flow 1 m3/min
=
16.667 l/s
1 cfm
=
0.4720 l/s
1 m3/h
=
0.2778 l/s
1 l/s
=
2.1189 cfm

back to top

Imperial inch to metric mm dimensions comparison chart
Inch
"

0"
mm

1"
mm

2"
mm

3"
mm
4"
mm
5"
mm
6"
mm
7"
mm
8"
mm
9"
mm
10"
mm
    25.3995 50.7990 76.1986 101.598 126.998 152.397 177.797 203.196 228.596 253.995
1/32
0.7937 26.1932 51.5928 76.9923 102.391 127.791 153.190 178.590 203.990 229.389 254.789
1/16
1.5874 26.987 52.3865 77.7860 103.185 128.585 153.984 179.384 204.783 230.183 255.582
3/32
2.3812 27.7807 53.1802 78.5798 103.979 129.378 154.788 180.177 205.577 230.977 256.376
1/8
3.1749 28.5744 53.9740 79.3735 104.773 130.172 155.572 180.971 206.370 231.770 257.170
5/32
3.9686 29.3682 54.7677 80.1672 105.566 130.966 156.365 181.765 207.164 232.564 257.964
3/16
4.7624 30.1619 55.5614 80.9610 106.360 131.760 157.159 182.559 207.958 233.358 258.757
7/32
5.5561 30.9556 56.3552 81.7547 107.154 132.553 157.953 183.352 208.752 234.152 259.551
1/4
6.3498 31.7949 57.1489 82.5485 107.948 133.347 158.747 184.146 209.546 234.945 260.345
9/32
7.1436 32.5431 57.9426 83.3422 108.741 134.141 159.540 184.940 210.339 235.739 261.139
5/16
7.9373 33.3368 58.7364 84.1359 109.535 134.935 160.335 185.734 211.133 236.532 261.932
11/32
8.7310 34.1306 59.5301 84.9297 110.329 135.728 161.128 186.527 211.927 237.326 262.726
3/8
9.5248 34.9243 60.3239 85.7234 111.122 136.522 161.922 187.321 212.721 238.120 263.520
13/32
10.3185 35.7180 61.1176 86.5171 111.916 137.316 162.715 188.115 213.514 238.914 264.313
7/16
11.1122 36.5118 61.9113 87.3109 112.710 138.109 163.509 188.909 214.308 239.708 265.107
15/32
11.9060 37.3055 62.7051 88.1046 113.504 138.903 164.303

189.702

215.102 240.501 265.901
1/2
12.6997 38.0993 63.4988 88.8983 114.297 139.697 165.097 190.496 215.896 241.295 266.695
17/32
13.4934 38.8930 64.2925 89.6921 115.091 140.491 165.890

191.290

216.689 242.089 267.488
9/16
14.2872 39.6867 65.0863 90.4858 115.885 141.284 166.684 192.084 217.483 242.883 268.282
19/32
15.0809 40.4805 65.8800 91.2795 116.679 142.078 167.478

192.877

218.277 243.676 269.076
5/8
15.8747 41.2742 66.6737 92.0733 117.472 142.872 168.271 193.671 219.071 244.470 269.870
21/32
16.6684 42.0679 67.4675 92.8670 118.266 143.666 169.065

194.465

219.864 245.263 270.663
11/16
17.4621 42.8617 68.2612 93.6608 119.060 144.459 169.859 195.258 220.658 246.058 271.457
23/32
18.2559 43.6554 69.0549 94.4545 119.854 145.253 170.653

196.052

221.452 246.851 272.251
3/4
19.0496 44.4491 69.8487 95.2482 120.647 146.047 171.446 196.846 222.245 247.645 273.045
25/32
19.8433 45.2429 70.6424 96.0419 121.441 146.841 172.240

197.640

223.039 248.439 273.838
13/16
20.6371 46.0366 71.4362 96.8357 122.235 147.634 173.034 198.433 223.883 249.232 274.632
27/32
21.4308 46.8303 72.2299 97.6294 123.029 148.428 173.828

199.227

224.627 250.026 275.426
7/8
22.2245 47.6241 73.0236 98.4232 123.822 149.222 174.621 200.021 225.420 250.820 276.220
29/32
23.0183 48.4178 73.8173 99.2169 124.616 150.016 175.415

200.815

226.214 251.614 277.013
15/16
23.8120 49.2116 74.6111 100.011 125.410 150.809 176.209 201.608 227.008 252.407 277.807
31/32
24.6057 50.0053 75.4048 100.804 126.203 151.603 177.003

202.402

227.802 253.201 278.601

 

 

 


 


arrow back to top Tips and Tricks tips and tricks contact us contact us print this page print this page add this site to your favorites add to favorites empty Tips and Tricks links
last updated 18.8.15
 

All design & content © 2001-2015 Emazing International - Australia - ABN 61 149 129 938 - torque tools