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## Blog

31May

### Introduction to Torque Part 4

Recommended Maximum Torque Values

The information supplied here is intended to be an acceptable guide for normal conditions. For critical applications, further information and research will be necessary. The following basic assumptions have been made:

a. Bolts are new, standard finish, uncoated and not lubricated (other than the normal protective oil film)

b. The load will be 90% of the bolt yield strength

c. The coefficient of friction is 0.14

d. The final tightening sequence is achieved smoothly and slowly

If lubrication is to be applied to the nut/bolt, multiply the recommended torque by the appropriate factor shown in the table on intro to torque part 2. Alternatively, use the Torque/Tension Calculator which enables fastener and friction conditions to be modified with ease.

 M BOLT GRADE mm 3.6 4.6 5.6 5.8 6.8 8.8 9.8 10.9 12.9 Torque in N·m M 1.6 0.05 0.07 0.09 0.11 0.14 0.18 0.21 0.26 0.31 3.2 M 2 0.11 0.14 0.18 0.24 0.28 0.38 0.42 0.53 0.63 4 M 2.5 0.22 0.29 0.36 0.48 0.58 0.78 0.87 1.09 1.31 5 M 3 0.38 0.51 0.63 0.84 1.01 1.35 1.52 1.9 2.27 5.5 M 4 0.71 0.95 1.19 1.59 1.91 2.54 2.86 3.57 4.29 7 M 5 1.71 2.28 2.85 3.8 4.56 6.09 6.85 8.56 10.3 8 M 6 2.94 3.92 4.91 6.54 7.85 10.5 11.8 14.7 17.7 10 M 8 7.11 9.48 11.9 15.8 19 25.3 28.4 35.5 42.7 13 M 10 14.3 19.1 23.8 31.8 38.1 50.8 57.2 71.5 85.8 17 M 12 24.4 32.6 40.7 54.3 65.1 86.9 97.9 122 147 19 M 14 39 52 65 86.6 104 139 156 195 234 22 M 16 59.9 79.9 99.8 133 160 213 240 299 359 24 M 18 82.5 110 138 183 220 293 330 413 495 27 M 20 117 156 195 260 312 416 468 585 702 30 M 22 158 211 264 352 422 563 634 792 950 32 M 24 202 270 337 449 539 719 809 1,011 1,213 36 M 27 298 398 497 663 795 1,060 1,193 1,491 1,789 41 M 30 405 540 675 900 1,080 1,440 1,620 2,025 2,430 46 M 33 550 734 917 1,223 1,467 1,956 2,201 2,751 3,301 50 M 36 708 944 1,180 1,573 1,888 2,517 2,832 3,540 4,248 55 M 39 919 1,226 1,532 2,043 2,452 3,269 3,678 4,597 5,517 60 M 42 1,139 1,518 1,898 2,530 3,036 4,049 4,555 5,693 6,832 65 M 45 1,425 1,900 2,375 3,167 3,800 5,067 5,701 7,126 8,551 70 M 48 1,716 2,288 2,860 3,813 4,576 6,101 6,864 8,580 10,296 75 M 52 2,210 2,947 3,684 4,912 5,895 7,859 8,842 11,052 13,263 80 M 56 2,737 3,650 4,562 6,083 7,300 9,733 10,950 13,687 16,425 85 M 60 3,404 4,538 5,673 7,564 9,076 12,102 13,614 17,018 20,422 90 M 64 4,100 5,466 6,833 9,110 10,932 14,576 16,398 20,498 24,597 95 M 68 4,963 6,617 8,271 11,029 13,234 17,646 19,851 24,814 29,777 100

## FAQ

### Use Our Calculators

Norbar has devised easy-to-use online calculators that support the correct application of torque in three key areas:

1. Unit conversion to assist international measurement definitions.
2. Torque extension for setting correct values
3. Torque tension to identify precise levels of torque to be applied for individual applications.