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Posted on
September 6, 2021
inThe Chart Of Max Recommended Torque For Bolts
The following is a recommended maximum bolt torque table to help the operator determine the maximum bolt torque to select the appropriate hydraulic torque wrench.
| Strength grade | 4.8 | 6.8 | 8.8 | 10.9 | 12.9 | ||||||
| Min breaking strength | 400MPa | 600MPa | 800MPa | 1000MPa | 1200MPa | ||||||
| Material | General structural steel | Mechanical construction steel | Chrome molybdenum alloy steel | Ni-Cr-Mo alloy steel | Ni-Cr-Mo alloy steel | ||||||
| Bolt | A/F | Torque value | Torque value | Torque value | Torque value | ||||||
| M | S | KGM | NM | KGM | NM | KGM | NM | KGM | NM | KGM | NM |
| 16 | 24 | 9 | 87 | 13 | 131 | 18 | 174 | 25 | 245 | 30 | 294 |
| 18 | 27 | 13 | 128 | 20 | 192 | 26 | 256 | 37 | 360 | 44 | 432 |
| 20 | 30 | 17 | 170 | 26 | 256 | 35 | 341 | 49 | 479 | 59 | 575 |
| 22 | 34 | 24 | 232 | 36 | 348 | 47 | 465 | 69 | 653 | 80 | 784 |
| 24 | 36 | 30 | 294 | 45 | 442 | 60 | 589 | 84 | 828 | 101 | 994 |
| 27 | 41 | 44 | 432 | 66 | 647 | 88 | 863 | 124 | 1214 | 149 | 1457 |
| 30 | 46 | 60 | 585 | 89 | 877 | 119 | 1171 | 168 | 1646 | 201 | 1975 |
| 33 | 50 | 81 | 796 | 122 | 1195 | 162 | 1593 | 228 | 2240 | 274 | 2688 |
| 36 | 55 | 104 | 1023 | 157 | 1535 | 209 | 2046 | 294 | 2878 | 352 | 3453 |
| 39 | 60 | 135 | 1324 | 203 | 1986 | 270 | 2649 | 380 | 3725 | 456 | 4469 |
| 42 | 65 | 167 | 1638 | 251 | 2457 | 334 | 3277 | 470 | 4608 | 564 | 5529 |
| 45 | 70 | 209 | 2045 | 313 | 3068 | 417 | 4090 | 587 | 5752 | 704 | 6903 |
| 48 | 75 | 251 | 2461 | 376 | 3691 | 502 | 4921 | 706 | 6921 | 847 | 8305 |
| 52 | 80 | 325 | 3181 | 487 | 4771 | 649 | 6362 | 913 | 8946 | 1095 | 10736 |
| 56 | 85 | 404 | 3956 | 605 | 5934 | 807 | 7912 | 1135 | 11127 | 1362 | 13352 |
| 60 | 90 | 504 | 4932 | 755 | 7398 | 1006 | 9864 | 1415 | 13871 | 1698 | 16645 |
| 64 | 95 | 608 | 5960 | 912 | 8940 | 1216 | 11920 | 1710 | 16762 | 2052 | 20115 |
| 68 | 100 | 738 | 7230 | 1107 | 10845 | 1475 | 14460 | 2075 | 20335 | 2450 | 24401 |
| 72 | 105 | 885 | 8669 | 1327 | 13003 | 1769 | 17337 | 2488 | 24381 | 2985 | 29257 |
| 76 | 110 | 1050 | 10287 | 1574 | 15430 | 2099 | 20573 | 2952 | 28931 | 34717 | |
| 80 | 115 | 1234 | 12094 | 1851 | 18141 | 2468 | 24188 | 3471 | 34014 | 40815 | |
| 85 | 120 | 1493 | 14636 | 2240 | 21953 | 2987 | 29271 | 41163 | 49395 | ||
| 90 | 130 | 1787 | 17510 | 2680 | 26266 | 3573 | 35021 | 49248 | 59098 | ||
| 100 | 145 | 2484 | 24341 | 3726 | 36512 | 48683 | 68460 | 82152 | |||
| 110 | 155 | 3342 | 32751 | 49126 | 65501 | 92111 | 110533 | ||||
| 120 | 175 | 4378 | 42902 | 64354 | 85805 | 120663 | 144795 | ||||
| 125 | 180 | 48683 | 73024 | 97366 | 136920 | 164304 | |||||
Attention:
The data in the chart is measured under 60% yield limit of the bolt, the recommended tightening
torque is 70-80% of above data.
For example, for M52 grade 8.8 bolt, the tightening torque is 6362*(70-80)% = 4453-5090Nm.
The loosening torque should be 1.5-2.5 times of tightening torque.
TorcStark
TorcStark® is a professional manufacturer of hydraulic equipment. Mainly produce hydraulic torque wrenches, hydraulic bolt tensioners, hydraulic torque /tensioner pumps and other products.
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6 comments on “The Chart Of Max Recommended Torque For Bolts”
layer
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TorcStark
Thanks
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