Suggested Maximum Torque Values for Screws and Bolts

This applies to clean and and dry parts. A lubricated bolt requires less torque to attain the same clamping force as a non-lubricated bolt. The values are stated in Inch pounds.

Bolt Size Thds Per Inch Low Carbon Steel 18-8 St. St. Yellow Brass Silicon Bronze Aluminum 2024-T4 316 St. St. Monel Other Other
0 80 1.0 --- --- --- --- --- --- --- ---
1 64 1.5 --- --- --- --- --- --- --- ---
72 2.0 --- --- --- --- --- --- --- ---
2 56 2.2 2.5 2.0 2.3 1.4 2.6 2.5 --- ---
64 2.7 3.0 2.5 2.8 1.4 3.2 3.1 --- ---
3 48 3.5 3.9 3.2 3.6 2.1 4.0 4.0 --- ---
56 4.0 4.4 3.6 4.1 2.4 4.6 4.5 --- ---
4 40 4.7 5.2 4.3 4.8 2.9 5.5 5.3 --- ---
48 5.9 6.6 5.4 6.1 3.6 6.9 6.7 --- ---
5 40 6.9 7.7 6.3 7.1 4.2 8.1 7.8 --- ---
44 8.5 9.4 7.7 8.7 5.1 9.8 9.6 --- ---
6 32 8.7 9.6 7.9 8.9 5.3 10.1 9.8 --- ---
40 10.9 12.1 9.9 11.2 6.6 12.7 12.3 --- ---
8 32 17.8 19.8 16.2 18.4 10.8 20.7 20.2 --- ---
36 19.8 22.0 18.0 20.4 12.0 23.0 22.4 --- ---
10 24 20.8 22.8 18.6 21.2 13.8 23.8 25.9 --- ---
32 29.7 31.7 25.9 29.3 19.2 33.1 34.9 --- ---
12 24 --- --- --- --- --- --- --- --- ---
28 --- --- --- --- --- --- --- --- ---
1/4 20 65.0 75.2 61.5 68.8 45.6 78.8 85.3 --- ---
28 90.0 94.0 77.0 87.0 57.0 99.0 106.0 --- ---
5/16 18 129 132 107 123 80 138 149 --- ---
24 139 142 116 131 86 147 160 --- ---
3/8 16 212 236 192 219 143 247 266 --- ---
24 232 259 212 240 157 271 297 --- ---
7/16 14 338 376 317 349 228 393 427 --- ---
20 361 400 327 371 242 418 451 --- ---
1/2 13 465 517 422 480 313 542 584 --- ---
20 487 541 443 502 328 565 613 --- ---
9/16 12 613 682 558 632 413 713 774 --- ---
18 668 752 615 697 456 787 855 --- ---
5/8 11 1000 1110 907 1030 715 1160 1330 --- ---
18 1140 1244 1016 1154 798 1301 1492 --- ---
3/4 10 1259 1530 1249 1416 980 1582 1832 --- ---
16 1230 1490 1220 1382 958 1558 1790 --- ---
7/8 9 1919 2328 1905 2140 1495 2430 2775 --- ---
14 1911 2318 1895 2130 1490 2420 2755 --- ---
1 8 2832 3440 2815 3185 2205 3595 4130 --- ---
14 2562 3110 2545 2885 1995 3250 3750 --- ---

Other Torque Information

Torque Conversion Table

(To convert from column 1 to row 1, multiply by entry in table)

dyne-cm gm-cm oz-in. Kg-cm lb-in. N-m lb-ft Kg-m
dyne-cm 1 1.019x10-3 1.416x10-5 1.0197x10-6 8.850x10-7 10-7 7.375x10-8 1.019x10-8
gm-cm 980.665 1 1.388x10-2 10-3 8.679x10-4 9.806x10-5 7.233x10-5 10-5
oz-in. 7.061x104 72.007 1 7.200x10-2 6.25x10-2 7.061x10-3 5.208x10-3 7.200x10-4
Kg-cm 9.806x105 1000 13.877 1 .8679 9.806x10-2 7.233x10-2 10-2
lb-in. 1.129x106 1.152x103 16 1.152 1 .112 8.333x10-2 1.152x10-2
N-m 107 1.019x104 141.612 10.197 8.850 1 .737 .101
lb-ft 1.355x107 1.382x104 192 13.825 12 1.355 1 .138
Kg-m 9.806x107 105 1.388x103 100 86.796 9.806 7.233 1

TORQUE CONVERSION
Inch Inch Inch Foot Centimeter Meter
Grams Ounces Pounds Pounds Kilograms Kilograms
7.09 0.25
14.17 0.50
21.26 0.75
28.65 1.00
113.40 4.00 0.25
226.80 8.00 0.50
453.59 16.00 1.00 0.08 1.11
96.00 6.00 0.50 6.92
192.00 12.00 1.00 13.83 0.138
384.00 24.00 2.00 27.66 0.277
576.00 36.00 3.00 41.49 0.415
768.00 48.00 4.00 55.32 0.553
960.00 60.00 5.00 69.15 0.692
72.00 6.00 82.98 0.830
84.00 7.00 96.81 0.968
96.00 8.00 110.64 1.106
108.00 9.00 124.47 1.245
120.00 10.00 138.31 1.383


Bolt Torque Specifications
Bolt Size Inches Coarse Thread/ inch SAE 0-1-2 74,000 psi Low Carbon Steel SAE Grade 3 100,000 psi Med Carbon Steel SAE Grade 5 120,000 psi Med. Carbon Heat T. Steel SAE Grade 6 133,000 psi Med. Carbon Temp. Steel SAE Grade 7 133,000 psi Med. Carbon Alloy Steel SAE Grade 8 150,000 psi Med Carbon Alloy Steel
Standard Dry Torque in Foot-Pounds
1/4 20 6 9 10 12.5 13 14
5/16 18 12 17 19 24 25 29
3/8 16 20 30 33 43 44 47
7/16 14 32 47 54 69 71 78
1/2 13 47 69 78 106 110 119
9/16 12 69 103 114 150 154 169
5/8 11 96 145 154 209 215 230
3/4 10 155 234 257 350 360 380
7/8 9 206 372 382 550 570 600
1 8 310 551 587 825 840 700
1-1/8 7 480 872 794 1304 1325 1430
1-1/4 7 375 1211 1105 1815 1825 1975
1-3/8 6 900 1624 1500 2434 2500 2650
1-1/2 6 1100 1943 1775 2913 3000 3200
1-5/8 5.5 1470 2660 2425 3985 4000 4400
1-3/4 5 1900 3463 3150 5189 5300 5650
1-7/8 5 2360 4695 4200 6980 7000 7600
2 4.5 2750 5427 4550 7491 7500 8200
Bolt Torque Specifications
Bolt Size Inches or Number Coarse Thread/ inch Allen Head 160,000 psi High Carbon CaseH Steel Machine Scr. 60,000 psi Yellow Brass Machine Scr. 70,000 psi Silicone Bronze
Standard Dry Torque in Foot-Pounds
#2 56 ... 2 in # 2.3 in #
#3 48 ... 3.3 in # 3.7 in #
#4 40 ... 4.4 in # 4.0 in #
#5 40 ... 6.4 in # 7.2 in #
#6 32 21 8 in # 10 in #
#8 32 46 16 in # 19 in #
#10 24 60 20 in # 22 in #
1/4 20 16 65 in # 70 in #
5/16 18 33 110 in # 125 in #
3/8 16 54 17 20
7/16 14 84 27 30
1/2 13 125 37 41
9/16 12 180 49 53
5/8 11 250 78 88
3/4 10 400 104 117
7/8 9 640 160 180
1 8 970 215 250
1-1/8 7 1520 325 365
1-1/4 7 2130 400 450
1-3/8 6 2850 ... ...
1-1/2 6 3450 595 655
1-5/8 4700 ... ...
1-3/4 5 6100 ... ...
1-7/8 8200 ... ...
2 4-1/2 8800 ... ...
Bolt Torque Specifications METRIC
Bolt Size Millimeters
Coarse Thread Pitch
Standard 5D 71,160 psi Med. Carbon Steel
Standard 8G 113,800 psi Med Carbon Steel
Standard 10K 142,000 psi Med Carbon Steel
Standard 12K 170,674 psi Med Cabon Steel
Standard Dry Torque in Foot-Pounds
6mm 1.00 5 6 8 10
8mm 1.00 10 16 22 27
10mm 1.25 31 40 49
12mm 1.25 34 54 70 86
14mm 1.25 55 89 117 137
16mm 2.00 83 132 175 208
18mm 2.00 111 182 236 283
22mm 2.50 182 284 394 464
24mm 3.00 261 419 570 689
Bolt Torque Specifications WHITWORTH
Bolt Size Inches
Coarse Thread/ inch
Grades A & B 62,720 psi Med Carbon Steel
Grade S 112,000 psi Med Carbon Steel
Grade T 123,200 psi Med Carbon Steel
Grade V 145,600 psi Med Carbon Steel
Standard Dry Torque in Foot-Pounds
1/4 20 5 7 9 10
5/16 18 9 15 18 21
3/8 16 15 27 31 36
7/16 14 24 43 51 58
1/2 12 36 64 79 89
9/16 12 52 94 111 128
5/8 11 73 128 155 175
3/4 11 118 213 259 287
7/8 9 186 322 407 459
1 8 276 497 611 693