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Bolt Torque Chart

Updated : Aug. 22, 2025

The torque data below is provided for engineering reference only.

In actual assembly, torque-tension can be affected by many factors, such as operator technique, thread surface finish, and lubrication condition.

For the safest and most accurate torque values, perform trial tightening and verification under your actual working conditions. All final responsibility and risk rest with the user.

titanium bolt

Metric bolt torque chart

This chart provides the recommended maximum torque values for threaded products, but it is for reference only.

Thread Size Torque for Standard Threads in [N m]
Bolt Grade 3.6 4.6 5.6 6.8 8.8 10.9 12.9
M2 0,1 0,13 0,16 0,26 0,35 0,49 0,59
M2,5 0,2 0,27 0,34 0,54 0,72 1,01 1,21
M3 0,35 0,48 0,60 0,96 1,28 1,80 2,16
M4 0,81 1,12 1,39 2,23 2,97 4,18 5,02
M5 0,6 2,26 2,83 4,52 6,03 8,48 10,18
M6 2,8 3,84 4,80 7,69 10,25 14,41 17,29
M7 5,13 6,42 10,27 13,70 19,25 23,10
M8 9,35 11,69 18,70 24,93 35,06 42,07
M10 18 23 37 49 70 83
M12 32 40 65 86 121 146
M14 52 65 104 138 194 233
M16 81 101 161 215 302 363
M18 112 139 222 296 417 500
M20 157 197 315 420 590 709
M22 215 269 430 574 807 968
M24 272 340 544 726 1020 1224
M27 400 500 800 1067 1500 1800
M30 542 677 1083 1445 2032 2438
M33 739 923 1477 1969 2770 3323
M36 948 1185 1896 2528 3555 4266
M39 1229 1536 2457 3276 4607 5529
M42 1519 1899 3038 4050 5696 6835
M45 1898 2373 3796 5062 7118 8541
M48 2282 2853 4565 6086 8559 10271
M52 2954 3692 5907 7876 11076 13292
M56 3672 4591 7345 9793 13772 16526
M60 4582 5728 9164 12219 17183 20619
M64 5536 6920 11071 14762 20759 24911
M68 6720 8400 13440 17919 25199 30239

Screws made of aluminum, stainless steel, and titanium each have different performance characteristics due to their material properties.

ASTM A307

Bolt Size TPI Proof Load (lbs) Clamp Load (lbs) Tightening Torque (ft lbs)
Galv+Waxed Galv Plain
1⁄4 20 1,053 790 2 4 3
5⁄16 18 1,735 1,302 3 8 7
3⁄8 16 2,567 1,925 6 15 12
7⁄16 14 3,521 2,640 10 24 19
1⁄2 13 4,700 3,525 15 37 29
9⁄16 12 6,028 4,521 21 53 42
5⁄8 11 7,485 5,614 29 73 58
3⁄4 10 11,062 8,297 52 130 104
7⁄8 9 15,301 11,476 84 209 167
1 8 20,071 15,053 125 314 251
1 1⁄8 7 25,271 18,953 178 444 355
1 1⁄4 7 32,093 24,070 251 627 501
1 3⁄8 6 38,254 28,690 329 822 657
1 1⁄2 6 46,534 34,900 436 1,091 873
1 3⁄4 5 62,928 47,196 688 1,721 1,377
2 4 1⁄2 82,800 62,100 1,035 2,588 2,070
2 1⁄4 4 1⁄2 107,640 80,730 1,514 3,784 3,027
2 1⁄2 4 132,480 99,360 2,070 5,125 4,140
2 3⁄4 4 163,282 122,461 2,806 7,016 5,613
3 4 197,726 148,295 3,707 9,268 7,415
3 1⁄4 4 235,152 176,364 4,777 11,941 9,553
3 1⁄2 4 275,890 206,917 6,035 15,088 12,070
3 3⁄4 4 319,939 239,954 7,499 18,746 14,997
4 4 366,970 275,227 9,174 22,936 18,348

SAE Grade 2

Bolt Size TPI Proof Load (lbs) Clamp Load (lbs) Tightening Torque (ft lbs)
Galv+Waxed Galv Plain
1⁄4 20 1,750 1,313 3 7 5
5⁄16 18 2,900 2,175 6 14 11
3⁄8 16 4,250 3,188 10 25 20
7⁄16 14 5,850 4,388 16 40 32
1⁄2 13 7,800 5,850 24 61 49
9⁄16 12 10,000 7,500 35 88 70
5⁄8 11 12,400 9,300 48 121 97
3⁄4 10 18,400 13,800 86 216 173
7⁄8 9 15,200 11,400 83 208 166
1 8 20,000 15,000 125 313 250
11⁄8 7 25,200 18,900 177 443 354
11⁄4 7 32,000 24,000 250 625 500
13⁄8 6 38,100 28,575 327 819 655
11⁄2 6 46,400 34,800 435 1,088 870

ASTM A325

Bolt Size TPI Tension Tightening Torque Range (ft lbs) (Min - Max)
Min Max Galv+Waxed Plain
1⁄2 13 12,000 14,000 50 - 58 100 - 117
5⁄8 11 19,000 23,000 99 - 120 198 - 240
3⁄4 10 28,000 34,000 175 - 213 350 - 425
7⁄8 9 39,000 47,000 284 - 343 569 - 685
1 8 51,000 61,000 425 - 508 850 - 1,017
11⁄8 7 64,000 77,000 600 - 722 1,200 - 1,444
11⁄4 7 81,000 98,000 844 - 1,021 1,687 - 2,042
13⁄8 6 97,000 117,000 1,111 - 1,341 2,223 - 2,681
11⁄2 6 118,000 143,000 1,475 - 1,788 2,950 - 3,575
5⁄8 11 19,000 23,000 99 - 120 198 - 240

ASTM A449 / SAE Grade 5

Bolt Size TPI Proof Load (lbs) Clamp Load (lbs) Tightening Torque (ft lbs)
Galv+Waxed Galv Plain
1⁄4 20 2,700 2,025 4 11 8
5⁄16 18 4,450 3,338 9 22 17
3⁄8 16 6,600 4,950 15 39 31
7⁄16 14 9,050 6,788 25 62 49
1⁄2 13 12,050 9,038 38 94 75
9⁄16 12 15,450 11,588 54 136 109
5⁄8 11 19,200 14,400 75 188 150
3⁄4 10 28,400 21,300 133 333 266
7⁄8 9 39,250 29,438 215 537 429
1 8 51,500 38,625 322 805 644
11⁄8 7 56,450 42,338 397 992 794
11⁄4 7 71,700 53,775 560 1,400 1,120
13⁄8 6 85,450 64,088 734 1,836 1,469
11⁄2 6 104,000 78,000 975 2,438 1,950
13⁄4 5 104,500 78,375 1,143 2,857 2,286
2 41⁄2 137,500 103,125 1,719 4,297 3,438
21⁄4 41⁄2 178,750 134,063 2,514 6,284 5,027
21⁄2 4 220,000 165,000 3,438 8,594 6,875
23⁄4 4 271,150 203,363 4,660 11,651 9,321
3 4 328,350 246,263 6,157 15,391 12,313

SAE J429 grade 5 bolts do not exceed 1-1/2" diameter.

ASTM A193 B7 / ASTM A320 L7 / ASTM A354 BC

Bolt Size TPI Proof Load (lbs) Clamp Load (lbs) Tightening Torque (ft lbs)
Galv+Waxed Galv Plain
1⁄4 20 3,350 2,513 5 13 10
5⁄16 18 5,500 4,125 11 27 21
3⁄8 16 8,150 6,113 19 48 38
7⁄16 14 11,150 8,363 30 76 61
1⁄2 13 14,900 11,175 47 116 93
9⁄16 12 19,100 14,325 67 168 134
5⁄8 11 23,750 17,813 93 232 186
3⁄4 10 35,050 26,288 164 411 329
7⁄8 9 48,500 36,375 265 663 530
1 8 63,650 47,738 398 995 796
1 1⁄8 7 80,100 60,075 563 1,408 1,126
1 1⁄8 8 82,934 62,201 583 1,458 1,166
1 1⁄4 7 101,750 76,313 795 1,987 1,590
1 1⁄4 8 105,006 78,754 820 2,051 1,641
1 3⁄8 6 121,300 90,975 1,042 2,606 2,085
1 3⁄8 8 129,492 97,119 1,113 2,782 2,226
1 1⁄2 6 147,550 110,663 1,383 3,458 2,767
1 1⁄2 8 156,687 117,515 1,469 3,672 2,938
1 3⁄4 5 199,500 149,625 2,182 5,455 4,364
1 3⁄4 8 218,400 163,800 - - 4,778
2 41⁄2 262,500 196,875 3,281 8,203 6,563
2 8 290,850 218,138 - - 7,271
2 1⁄4 41⁄2 341,250 255,938 4,799 11,997 9,598
2 1⁄4 8 373,801 280,351 - - 10,513
2 1⁄2 4 420,000 315,000 6,563 16,406 13,125
2 1⁄2 8 466,200 349,650 - - 14,569
2 3⁄4 4 468,500 351,263 8,050 20,124 16,100
2 3⁄4 8 515,851 386,888 - - 17,732
3 4 567,150 425,363 10,634 26,585 21,268
3 8 618,451 463,838 - - 23,192
3 1⁄4 4 674,500 505,875 13,701 34,252 27,402
3 1⁄4 8 730,550 547,913 - - 29,679
3 1⁄2 4 791,350 593,513 17,311 43,277 34,622
3 1⁄2 8 851,201 638,401 - - 37,240
3 3⁄4 4 917700 688275 21,509 53,771 43,017
3 3⁄4 8 982,300 736,725 - - 46,045
4 4 1052600 789450 26,315 65,788 52,630
4 8 1,121,950 841,463 - - 56,098

ASTM A490

Bolt Size TPI Tension Tightening Torque Range (ft lbs) (Min - Max)
Min Max Plain Lubricated
1⁄2 13 15,000 18,000 125 - 150 63 - 75
5⁄8 11 24,000 29,000 250 - 302 125 - 151
3⁄4 10 35,000 42,000 438 - 525 219 - 263
7⁄8 9 49,000 59,000 715 - 860 357 - 430
1 8 64,000 77,000 1,067 - 1,283 533 - 642
1 1⁄8 7 80,000 96,000 1,500 - 1,800 750 - 900
1 1⁄4 7 102,000 122,000 2,125 - 2,542 1,063 - 1,271
1 3⁄8 6 121,000 145,000 2,773 - 3,323 1,386 - 1,661
1 1⁄2 6 148,000 178,000 3,700 - 4,450 1,850 - 2,225

ASTM A354-BD / SAE Grade 8

Bolt Size TPI Proof Load (lbs) Clamp Load (lbs) Tightening Torque (ft lbs)
Plain Lubricated
1⁄4 20 3,800 2,850 12 6
5⁄16 18 6,300 4,725 25 12
3⁄8 16 9,300 6,975 44 22
7⁄16 14 12,750 9,563 70 35
1⁄2 13 17,050 12,788 107 53
9⁄16 12 21,850 16,388 154 77
5⁄8 11 27,100 20,325 212 106
3⁄4 10 40,100 30,075 376 188
7⁄8 9 55,450 41,588 606 303
1 8 72,700 54,525 909 454
1 1⁄8 7 91,550 68,663 1,287 644
1 1⁄4 7 120,000 90,000 1,875 938
1 3⁄8 6 138,600 103,950 2,382 1,191
1 1⁄2 6 168,600 126,450 3,161 1,581
1 3⁄4 5 228,000 171,000 4,988 2,494
2 4 1⁄2 300,000 225,000 7,500 3,750
2 1⁄4 4 1⁄2 390,000 292,500 10,969 5,484
2 1⁄2 4 480,000 360,000 15,000 7,500
2 3⁄4 4 517,650 388,238 17,794 8,897
3 4 626,850 470,138 23,507 11,753
3 1⁄4 4 745,500 559,125 30,286 15,143
3 1⁄2 4 874,650 655,988 38,266 19,133
3 3⁄4 4 1,014,300 760,725 47,545 23,773
4 4 1,163,400 872,550 58,100 29,085

SAE J429 grade 8 bolts do not exceed 1-1/2″ diameter.

Terminology explanation

Terminology explanation

Proof load

This is the "pass” value obtained in a tensile test of a complete bolt (including the threads and head) in a laboratory setting. If the bolt reaches this load without permanent elongation, deformation, or fracture, it is considered qualified.

If a specific bolt standard does not list an official proof load, it can be estimated at approximately 92 % of its minimum yield strength.

Clamp load

To maintain a safety margin, we typically set the target clamp load at 75 % of the proof load. This ensures that, after tightening, the bolt remains well below its limit and is less likely to break.

Note: The 75 % value is a general guideline. Certain designs or engineers may specify a different percentage.

Torque

Torque is the rotational force applied to make an object turn, measured in newton-meters (N·m).

The basic formula: M = F × l

People also ask - FAQ

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