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Skip to content 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 11 ⁄8 7 25,271 18,953 178 444 355 11 ⁄4 7 32,093 24,070 251 627 501 13 ⁄8 6 38,254 28,690 329 822 657 11 ⁄2 6 46,534 34,900 436 1,091 873 13 ⁄4 5 62,928 47,196 688 1,721 1,377 2 41 ⁄2 82,800 62,100 1,035 2,588 2,070 21 ⁄4 41 ⁄2 107,640 80,730 1,514 3,784 3,027 21 ⁄2 4 132,480 99,360 2,070 5,125 4,140 23 ⁄4 4 163,282 122,461 2,806 7,016 5,613 3 4 197,726 148,295 3,707 9,268 7,415 31 ⁄4 4 235,152 176,364 4,777 11,941 9,553 31 ⁄2 4 275,890 206,917 6,035 15,088 12,070 33 ⁄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
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 11 ⁄8 7 80,100 60,075 563 1,408 1,126 11 ⁄8 8 82,934 62,201 583 1,458 1,166 11 ⁄4 7 101,750 76,313 795 1,987 1,590 11 ⁄4 8 105,006 78,754 820 2,051 1,641 13 ⁄8 6 121,300 90,975 1,042 2,606 2,085 13 ⁄8 8 129,492 97,119 1,113 2,782 2,226 11 ⁄2 6 147,550 110,663 1,383 3,458 2,767 11 ⁄2 8 156,687 117,515 1,469 3,672 2,938 13 ⁄4 5 199,500 149,625 2,182 5,455 4,364 13 ⁄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 21 ⁄4 41 ⁄2 341,250 255,938 4,799 11,997 9,598 21 ⁄4 8 373,801 280,351 – – 10,513 21 ⁄2 4 420,000 315,000 6,563 16,406 13,125 21 ⁄2 8 466,200 349,650 – – 14,569 23 ⁄4 4 468,500 351,263 8,050 20,124 16,100 23 ⁄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 31 ⁄4 4 674,500 505,875 13,701 34,252 27,402 31 ⁄4 8 730,550 547,913 – – 29,679 31 ⁄2 4 791,350 593,513 17,311 43,277 34,622 31 ⁄2 8 851,201 638,401 – – 37,240 33 ⁄4 4 917700 688275 21,509 53,771 43,017 33 ⁄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 (lbs) 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 11 ⁄8 7 80,000 96,000 1,500 – 1,800 750 – 900 11 ⁄4 7 102,000 122,000 2,125 – 2,542 1,063 – 1,271 13 ⁄8 6 121,000 145,000 2,773 – 3,323 1,386 – 1,661 11 ⁄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 11 ⁄8 7 91,550 68,663 1,287 644 11 ⁄4 7 120,000 90,000 1,875 938 13 ⁄8 6 138,600 103,950 2,382 1,191 11 ⁄2 6 168,600 126,450 3,161 1,581 13 ⁄4 5 228,000 171,000 4,988 2,494 2 41 ⁄2 300,000 225,000 7,500 3,750 21 ⁄4 41 ⁄2 390,000 292,500 10,969 5,484 21 ⁄2 4 480,000 360,000 15,000 7,500 23 ⁄4 4 517,650 388,238 17,794 8,897 3 4 626,850 470,138 23,507 11,753 31 ⁄4 4 745,500 559,125 30,286 15,143 31 ⁄2 4 874,650 655,988 38,266 19,133 33 ⁄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.
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