Table of Pretightening Torque of Ordinary Bolt Set（N.m）
| Thread Specification dxp | Class-8.8 | Class-10.9 | Class-12.9 |
| M5*0.8 | 5 | 7 | 8.5 |
| M6*1 | 8.5 | 12 | 14 |
| M8*1.25 | 20 | 28 | 35 |
| M10*1.5 | 40 | 58 | 70 |
| M12*1.75 | 71 | 100 | 120 |
| M14*2 | 115 | 160 | 195 |
| M16*2 | 175 | 250 | 300 |
| M18*2.5 | 245 | 345 | 410 |
| M20*2.5 | 350 | 490 | 585 |
| M22*2.5 | 470 | 660 | 790 |
| M24*3 | 600 | 840 | 1000 |
| Thread Specification dxp | Class-8.8 | Class-10.9 | Class-12.9 |
| M27*3 | 870 | 1225 | 1470 |
| M30*3.5 | 1190 | 1670 | 2020 |
| M33*3.5 | 1600 | 2250 | 2700 |
| M36*4 | 2050 | 2860 | 3450 |
| M39*4 | 2580 | 3630 | 4360 |
| M42*4.5 | 3200 | 4320 | 5200 |
| M45*4.5 | 3830 | 5300 | 6460 |
| M48*5 | 4600 | 6500 | 7800 |
| M52*5 | 5900 | 8300 | 9900 |
| M56*5.5 | 7300 | 10000 | 12400 |
| M60*5.5 | 9200 | 13000 | 15000 |
Table of Pretightening Torque of Bolt Set for Hinged hole（N.m）
| Thread Specification dxp | Class-8.8 | Class-10.9 | Class-12.9 |
| M6*1 | 6 | 8.4 | 9.8 |
| M8*1.25 | 14 | 20 | 25 |
| M10*1.5 | 28 | 41 | 49 |
| M12*1.75 | 50 | 70 | 84 |
| M14*2 | 81 | 112 | 137 |
| M16*2 | 123 | 175 | 210 |
| M18*2.5 | 172 | 242 | 287 |
| M20*2.5 | 245 | 345 | 410 |
| M22*2.5 | 330 | 465 | 555 |
| M24*3 | 420 | 590 | 700 |
| Thread Specification dxp | Class-8.8 | Class-10.9 | Class-12.9 |
| M27*3 | 610 | 860 | 1030 |
| M30*3.5 | 835 | 1170 | 1420 |
| M33*3.5 | 1120 | 1575 | 1890 |
| M36*4 | 1435 | 2010 | 2420 |
| M39*4 | 1810 | 2550 | 3060 |
| M42*4.5 | 2240 | 3030 | 3640 |
| M45*4.5 | 2680 | 3760 | 4520 |
| M48*5 | 3240 | 4550 | 5460 |
| M52*5 | 4140 | 5810 | 6930 |
| M56*5.5 | 5150 | 7210 | 8680 |
Notes: 1. The mechanical property of the bolt set shall be able to meet the provisions of GB/T3098.
2. The pretightening torque of bolt is collated and edited as per related mechanical design manual for your reference.