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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 bolts
Bolt tension for stretch bolts
Tension bolts
Bolt tension for bolts with shaft
Hex bolts
Bolt tension for stretch bolts
Tension bolts
Bolt tension for bolts with shaft
Hex bolts
Bolt tension for stretch bolts
Tension bolts
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 !

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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 !

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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 !

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last updated 18.8.15
 

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