TIGHT TORQUE RANGES FOR STAINLESS STEEL BOLTS USING IMPART USA ANTI GALL SEALANT
Short-Form Equation: where: T = Fp (K D) T = input torque (lb-in) Fp = acieved preload (lb.) D = nominal bolt diameter ( in.) K = "nut factor" (dimensionless) 0.13 Impart USA Stainless Steel Anti-gall Fp = minimum yield strength x stress area of bolt (lb.) (The 70 to 75 percent minimum yield strength is used for calculation Fp) 316 Stainless Steel Input Tprque Bolt Preload T Fp (lb.in.) (lb.) 21.7 24.8 44.7 49.5 79.3 89.9 127.0 141.8 193.7 218.3 279.5 311.7 385.6 436.8 684 764 1104 1216 1654 1810 2343 2428 2629 3307 3411 3662 4336 4630 4936 5753 6109 6474 24.8 28.4 51.1 56.6 90.7 102.7 145.1 162.0 221.4 249.4 319.4 356.3 440.7 499.2 782 873 1261 1390 1891 2069 2678 2775 3005 3779 3899 4185 4955 5292 5641 6575 6982 7399 668 764 1,100 1,218 1,628 1,844 2,232 2,493 2,980 3,358 3,822 4,263 4,746 5,376 7,014 7,833 9,702 10,689 12,726 13,923 16,023 16,601 17,976 20,349 20,994 22,533 24,255 25,904 27,615 29,505 31,328 33,201 763 874 1,258 1,392 1,860 2,107 2,551 2,849 3,406 3,838 4,368 4,872 5,424 6,144 8,016 8,952 11,088 12,216 14,544 15,912 18,312 18,972 20,544 23,256 23,993 25,752 27,720 29,604 31,560 33,720 35,803 37,944 NITRONIC 50 Stainless Steel Input Torque Bolt Preload T Fp (lb.in.) (lb.) 43.4 49.7 89.4 99.0 158.7 179.8 253.9 283.5 387.4 436.5 559.0 623.5 771.2 873.6 1368 1527 2207 2432 3309 3620 4687 4856 5258 6613 6823 7323 8671 9261 9872 11507 12218 12948 49.6 56.8 102.2 113.1 181.4 205.5 290.2 324.1 442.7 498.9 638.8 712.5 881.4 998.4 1563 1746 2523 2779 3781 4137 5356 5549 6009 7558 7798 8369 9910 10583 11283 13151 13963 14798 1,336 1,529 2,201 2,436 3,255 3,688 4,465 4,985 5,960 6,716 7,644 8,526 9,492 10,752 14,028 15,666 19,404 21,378 25,452 27,846 32,046 33,201 35,952 40,698 41,987 45,066 48,510 51,807 55,230 59,010 62,656 66,402 1,526 1,747 2,515 2,784 3,720 4,214 5,102 5,698 6,811 7,675 8,736 9,744 10,848 12,288 16,032 17,904 22,176 24,432 29,088 31,824 36,624 37,944 41,088 46,512 47,986 51,504 55,440 59,208 63,120 67,440 71,606 75,888 NITRONIC 60 Stainless Steel Input Tprque Bolt Preload T Fp (lb.in.) (lb.) 36.2 41.4 74.5 82.5 132.2 149.8 211.6 236.3 322.8 363.8 465.8 519.6 642.7 728.0 1140 1273 1839 2026 2757 3017 3906 4046 4382 5511 5686 6103 7226 7717 8227 9589 10182 10790 38.8 44.4 79.8 88.4 141.7 160.5 226.7 253.2 345.9 389.8 499.1 556.7 688.6 780.0 1221 1364 1971 2171 2954 3232 4185 4335 4695 5905 6092 6539 7742 8268 8815 10274 10909 11561 1,113 1,274 1,834 2,030 2,713 3,073 3,721 4,155 4,967 5,597 6,370 7,105 7,910 8,960 11,690 13,055 16,170 17,815 21,210 23,205 26,705 27,668 29,960 33,915 34,990 37,555 40,425 43,173 46,025 49,175 52,213 55,335 1,193 1,365 1,965 2,175 2,906 3,293 3,986 4,451 5,321 5,996 6,825 7,613 8,475 9,600 12,525 13,988 17,325 19,088 22,725 24,863 28,613 29,644 32,100 36,338 37,489 40,238 43,313 46,256 49,313 52,688 55,943 59,288 High Strength Stainless Steel Input Tprque Bolt Preload T Fp (lb.in.) (lb.) 61.5 70.4 126.7 140.2 224.8 254.7 359.7 401.7 548.8 618.4 791.9 883.2 1092.6 1237.6 1938 2164 3127 3445 4687 5128 6640 6879 7449 9369 9666 10375 12284 13119 13986 16302 17309 18344 70.3 80.4 144.8 160.2 256.9 291.1 411.1 459.1 627.2 706.8 905.0 1,892 2,166 3,118 3,451 4,611 5,224 6,325 7,063 8,443 9,514 10,829 2,162 2,475 3,563 3,944 5,270 5,970 7,228 8,072 9,649 10,873 12,376 13,804 15,368 17,408 22,712 25,364 31,416 34,612 41,208 45,084 51,884 53,754 58,208 65,892 67,980 72,964 78,540 83,878 89,420 95,540 101,442 107,508
and Bolt Nominal Diameter ( in.) 0.2500 0.2500 0.3125 0.3125 0.3750 0.3750 0.4375 0.4375 0.5000 0.5000 0.5625 0.5625 0.6250 0.6250 0.7500 0.7500 0.8750 0.8750 1.0000 1.0000 1.1250 1.1250 1.1250 1.2500 1.2500 1.2500 1.3750 1.3750 1.3750 1.5000 1.5000 1.5000
Bolt Size 1/4 --20 1/4 -- 28 5/6 -- 18 5/6 -- 24 3/8 -- 16 3/8 -- 24 7/16 -- 14 7/16 -- 20 1/2 -- 13 1/2 -- 20 9/16 -- 12 9/16 -- 18 5/8 -- 11 5/8 -- 18 3/4 -- 10 3/4 -- 16 7/8 -- 9 7/8 -- 14 1 -- 8 1 -- 12 1-1/8 -- 7 1-1/8 -- 8 1-1/8 -12 1-1/4 --7 1-1/4 - 8 1-1/4 --12 1-3/8 -- 6 1-3/8 - 8 1-3/8 --12 1-1/2 --6 1-1/2 -8 1-1/2 --12
Stress Area of Bolt (in^2) 0.0318 0.0364 0.0524 0.0580 0.0775 0.0878 0.1063 0.1187 0.1419 0.1599 0.1820 0.2030 0.2260 0.2560 0.3340 0.3730 0.4620 0.5090 0.6060 0.6630 0.7630 0.7905 0.8560 0.9690 0.9997 1.0730 1.1550 1.2335 1.3150 1.4050 1.4918 1.5810
1009.4 12,079 1248.7 13,447 1414.4 15,232 2214 2473 3574 3937 5357 5861 7588 7862 8513 10707 11047 11857 14039 14993 15984 18630 19781 20964 19,873 22,194 27,489 30,286 36,057 39,449 45,399 47,035 50,932 57,656 59,482 63,844 68,723 73,393 78,243 83,598 88,762 94,070
1.125 1.25 1.375 1.5 1
8 8 8 8 8
A = 0.7854 ( D -0.9743/n)^2 0.7905 0.9997 1.2335 1.4918 0.6057
Page 1
Sheet2
TIGHT TORQUE RANGES FOR STAINLESS STEEL BOLTS
Short-Form Equation: where: T = Fp (K D)
and Bolt Nominal Diameter in. 0.2500 0.2500 0.3125 0.3125 0.3750 0.3750 0.4375 0.4375 0.5000 0.5000 0.5625 0.5625 0.6250 0.6250 0.7500 0.7500
T = input torque (lb-in) Fp = acieved preload (lb.) D = nominal bolt diameter ( in.) K = "nut factor" (dimensionless) (K = 0.15 is used here) Fp = minimum yield strength x stress area of bolt (lb.) (The 70% minimum yield strength is used for calculat 316 Torque T lb.in. (lb.ft.) 25.0 28.7 51.6 57.1 91.5 103.7 146.5 163.6 223.5 251.8 322.5 359.7 444.9 504.0 789.1 881.2 18.6 21.0 26.9 30.0 37.1 42.0 65.8 73.4 NITRONIC 50 Torque Preload T Fp lb.in. (lb.ft.) lb. 50.1 57.3 103.2 114.2 183.1 207.4 293.0 327.2 447.0 503.7 645.0 719.4 889.9 1008.0 1578.2 1762.4 37.2 42.0 53.7 59.9 74.2 84.0 131.5 146.9 1,336 1,529 2,201 2,436 3,255 3,688 4,465 4,985 5,960 6,716 7,644 8,526 9,492 10,752 NITRONIC 60 Torque T lb.in. (lb.ft.) 41.7 47.8 86.0 95.2 152.6 172.9 244.2 272.6 372.5 419.7 537.5 599.5 741.6 840.0 31.0 35.0 44.8 50.0 61.8 70.0 109.6 122.4 High
Bolt Size 1/4 --20 1/4 -- 28 5/6 -- 18 5/6 -- 24 3/8 -- 16 3/8 -- 24 7/16 -- 14 7/16 -- 20 1/2 -- 13 1/2 -- 20 9/16 -- 12 9/16 -- 18 5/8 -- 11 5/8 -- 18 3/4 -- 10 3/4 -- 16
Stress Area of Bolt in^2 0.0318 0.0364 0.0524 0.0580 0.0775 0.0878 0.1063 0.1187 0.1419 0.1599 0.1820 0.2030 0.2260 0.2560 0.3340 0.3730
Preload Fp lb. 668 764 1,100 1,218 1,628 1,844 2,232 2,493 2,980 3,358 3,822 4,263 4,746 5,376 7,014 7,833
14,028 1315.1 15,666 1468.7
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Sheet2
Bolt Size 7/8 -- 9 7/8 -- 14 1 -- 8 1 -- 12 1-1/8 -- 7 1-1/8 -- 8 1-1/8 -- 12 1-1/4 -- 7 1-1/4 -- 8 1-1/4 --12 1-3/8 -- 6 1-3/8 -- 8 1-3/8 --12 1-1/2 -- 6 1-1/2 -- 8 1-1/2 --12
Bolt Nominal Diameter in. 0.8750 0.8750 1.0000 1.0000 1.1250 1.1250 1.1250 1.2500 1.2500 1.2500 1.3750 1.3750 1.3750 1.5000 1.5000 1.5000
Stress Area of Bolt in^2 0.4620 0.5090 0.6060 0.6630 0.7630 0.7905 0.8560 0.9690 0.9997 1.0730 1.1550 1.2335 1.3150 1.4050 1.4918 1.5810
316 Torque T lb.in. (lb.ft.) 1273.4 1402.9 1908.9 2088.5 106.1 116.9 159.1 174.0 225.3 233.4 252.8 318.0 328.0 352.1 416.9 445.2 474.6 553.2 587.4 622.5
Preload Fp lb. 9,702
NITRONIC 50 Torque Preload T Fp lb.in. (lb.ft.) lb. 2546.8 212.2 233.8 318.2 348.1 450.6 466.9 505.6 635.9 656.1 704.2 833.8 890.4 949.3
NITRONIC 60 Torque T lb.in. (lb.ft.) 176.9 194.9 265.1 290.1 375.5 389.1 421.3 529.9 546.7 586.8 694.8 742.0 791.1 922.0 979.0 1037.5
High
19,404 2122.3 21,378 2338.2 25,452 3181.5 27,846 3480.8 32,046 33,201 35,952 40,698 41,987 45,066 48,510 51,807 55,230
10,689 2805.9 12,726 3817.8 13,923 4176.9 16,023 16,601 17,976 20,349 20,994 22,533 24,255 25,904 27,615 29,505 31,328 33,201
1106.4 59,010 1174.8 62,656 1245.0 66,402
1.125 1.25 1.375 1.5 1
8 8 8 8 8
A = 0.7854 ( D -0.9743/n)^2 0.7905 0.9997 1.2335 1.4918 0.6057
Page 3
Sheet2
TIGHT TORQUE RANGES FOR STAINLESS STEEL BOLTS
Short-Form Equation: where: T = Fp (K D) T = input torque (lb-in) Fp = acieved preload (lb.) D = nominal bolt diameter ( in.) K = "nut factor" (dimensionless) (K = 0.15 is used here) Fp = minimum yield strength x stress area of bolt (lb.) (The 70% minimum yield strength is used for calculation Fp) 316 Torque T lb.in. (lb.ft.) 25.0 28.7 51.6 57.1 91.5 103.7 146.5 163.6 223.5 251.8 322.5 359.7 444.9 504.0 789.1 881.2 18.6 21.0 26.9 30.0 37.1 42.0 65.8 73.4 NITRONIC 50 Torque Preload T Fp lb.in. (lb.ft.) lb. 50.1 57.3 103.2 114.2 183.1 207.4 293.0 327.2 447.0 503.7 645.0 719.4 889.9 1008.0 1578.2 1762.4 37.2 42.0 53.7 59.9 74.2 84.0 131.5 146.9 1,336 1,529 2,201 2,436 3,255 3,688 4,465 4,985 5,960 6,716 7,644 8,526 9,492 10,752 NITRONIC 60 Torque Preload T Fp lb.in. (lb.ft.) lb. 41.7 47.8 86.0 95.2 152.6 172.9 244.2 272.6 372.5 419.7 537.5 599.5 741.6 840.0 31.0 35.0 44.8 50.0 61.8 70.0 109.6 122.4 1,113 1,274 1,834 2,030 2,713 3,073 3,721 4,155 4,967 5,597 6,370 7,105 7,910 8,960 High Strength SS Torque Preload T Fp lb.in. (lb.ft.) lb. 71.0 81.2 146.1 161.8 259.4 293.9 415.1 463.5 633.2 713.6 913.7 1019.1 1260.7 1428.0 52.8 59.5 76.1 84.9 105.1 119.0 186.3 208.1 1,892 2,166 3,118 3,451 4,611 5,224 6,325 7,063 8,443 9,514 10,829 12,079 13,447 15,232 19,873 22,194
and Bolt Nominal Diameter in. 0.2500 0.2500 0.3125 0.3125 0.3750 0.3750 0.4375 0.4375 0.5000 0.5000 0.5625 0.5625 0.6250 0.6250 0.7500 0.7500
Bolt Size 1/4 --20 1/4 -- 28 5/6 -- 18 5/6 -- 24 3/8 -- 16 3/8 -- 24 7/16 -- 14 7/16 -- 20 1/2 -- 13 1/2 -- 20 9/16 -- 12 9/16 -- 18 5/8 -- 11 5/8 -- 18 3/4 -- 10 3/4 -- 16
Stress Area of Bolt in^2 0.0318 0.0364 0.0524 0.0580 0.0775 0.0878 0.1063 0.1187 0.1419 0.1599 0.1820 0.2030 0.2260 0.2560 0.3340 0.3730
Preload Fp lb. 668 764 1,100 1,218 1,628 1,844 2,232 2,493 2,980 3,358 3,822 4,263 4,746 5,376 7,014 7,833
14,028 1315.1 15,666 1468.7
11,690 2235.7 13,055 2496.8
Page 4
Sheet2
Bolt Size 7/8 -- 9 7/8 -- 14 1 -- 8 1 -- 12 1-1/8 -- 7 1-1/8 -- 8 1-1/8 -- 12 1-1/4 -- 7 1-1/4 -- 8 1-1/4 --12 1-3/8 -- 6 1-3/8 -- 8 1-3/8 --12 1-1/2 -- 6 1-1/2 -- 8 1-1/2 --12
Bolt Nominal Diameter in. 0.8750 0.8750 1.0000 1.0000 1.1250 1.1250 1.1250 1.2500 1.2500 1.2500 1.3750 1.3750 1.3750 1.5000 1.5000 1.5000
Stress Area of Bolt in^2 0.4620 0.5090 0.6060 0.6630 0.7630 0.7905 0.8560 0.9690 0.9997 1.0730 1.1550 1.2335 1.3150 1.4050 1.4918 1.5810
316 Torque T lb.in. (lb.ft.) 1273.4 1402.9 1908.9 2088.5 106.1 116.9 159.1 174.0 225.3 233.4 252.8 318.0 328.0 352.1 416.9 445.2 474.6 553.2 587.4 622.5
Preload Fp lb. 9,702
NITRONIC 50 Torque Preload T Fp lb.in. (lb.ft.) lb. 2546.8 212.2 233.8 318.2 348.1 450.6 466.9 505.6 635.9 656.1 704.2 833.8 890.4 949.3
NITRONIC 60 Torque Preload T Fp lb.in. (lb.ft.) lb. 176.9 194.9 265.1 290.1 375.5 389.1 421.3 529.9 546.7 586.8 694.8 742.0 791.1 922.0
High Strength SS Torque Preload T Fp lb.in. (lb.ft.) lb. 300.7 331.2 450.7 493.1 638.4 661.4 716.2 900.9 929.4 997.6 27,489 30,286 36,057 39,449 45,399 47,035 50,932 57,656 59,482 63,844
19,404 2122.3 21,378 2338.2 25,452 3181.5 27,846 3480.8 32,046 33,201 35,952 40,698 41,987 45,066 48,510 51,807 55,230
16,170 3607.9 17,815 3975.0 21,210 5408.6 23,205 5917.3 26,705 27,668 29,960 33,915 34,990 37,555 40,425 43,173 46,025 49,175
10,689 2805.9 12,726 3817.8 13,923 4176.9 16,023 16,601 17,976 20,349 20,994 22,533 24,255 25,904 27,615 29,505 31,328 33,201
1181.2 68,723 1261.4 73,393 1344.8 78,243 1567.5 83,598 1664.3 88,762 1763.8 94,070
1106.4 59,010 1174.8 62,656 1245.0 66,402
979.0 52,213 1037.5 55,335
1.125 1.25 1.375 1.5 1
8 8 8 8 8
A = 0.7854 ( D -0.9743/n)^2 0.7905 0.9997 1.2335 1.4918 0.6057
Page 5
CONTROL SYSTEM APPLICATIONS
TIGHTENING TORQUE FOR STAINLESS STEEL BOLTS
Short-Form Equation: where: T = Fp (K D) T = input torque (lb-in) Fp = acieved preload (lb.) D = nominal bolt diameter ( in.) K = "nut factor" (dimensionless) (K = 0.15 is used here) Fp = minimum yield strength x stress area of bolt (lb.) Note: Apply Antisieze Lubricant to threads and Bearing Faces of Screw, Bolt or Nuts before assembly. Use torque values specified by manufacturer for purchased components.
and
(70% minimum yield strength is used for calculation Fp) Bolt or Screw Size #4 -- 40 #4 -- 48 #6 -- 32 #6 -- 40 #8 -- 32 #8 -- 36 #10 -- 24 #10 -- 32 1/4 --20 1/4 -- 28 5/6 -- 18 5/6 -- 24 3/8 -- 16 3/8 -- 24 7/16 -- 14 7/16 -- 20 1/2 -- 13 1/2 -- 20 9/16 -- 12 9/16 -- 18 5/8 -- 11 5/8 -- 18 3/4 -- 10 3/4 -- 16 7/8 -- 9 7/8 -- 14 1 -- 8 1 -- 12 1-1/8 -- 7 1-1/8 -- 8 1-1/8 -- 12 1-1/4 -- 7 1-1/4 -- 8 1-1/4 --12 1-3/8 -- 6 1-3/8 -- 8 1-3/8 --12 1-1/2 -- 6 1-1/2 -- 8 1-1/2 --12 Bolt Nominal Diameter in. 0.1120 0.1120 0.1380 0.1380 0.1640 0.1640 0.1900 0.1900 0.2500 0.2500 0.3125 0.3125 0.3750 0.3750 0.4375 0.4375 0.5000 0.5000 0.5625 0.5625 0.6250 0.6250 0.7500 0.7500 0.8750 0.8750 1.0000 1.0000 1.1250 1.1250 1.1250 1.2500 1.2500 1.2500 1.3750 1.3750 1.3750 1.5000 1.5000 1.5000 Stress Area of Bolt in^2 0.0060 0.0066 0.0091 0.0102 0.0140 0.0147 0.0175 0.0200 0.0318 0.0364 0.0524 0.0580 0.0775 0.0878 0.1063 0.1187 0.1419 0.1599 0.1820 0.2030 0.2260 0.2560 0.3340 0.3730 0.4620 0.5090 0.6060 0.6630 0.7630 0.7905 0.8560 0.9690 0.9997 1.0730 1.1550 1.2335 1.3150 1.4050 1.4918 1.5810 316 Torque T lb.in. 2 2 4 4 7 8 10 12 25 29 52 57 92 104 146 164 223 252 322 360 445 504 789 881 1273 1403 1909 2088 19 21 27 30 37 42 66 73 106 117 159 174 225 233 253 318 328 352 417 445 475 553 587 623 (lb.ft.) Preload Fp lb. 127 139 191 213 294 310 368 420 668 764 1,100 1,218 1,628 1,844 2,232 2,493 2,980 3,358 3,822 4,263 4,746 5,376 7,014 7,833 9,702 10,689 12,726 13,923 16,023 16,601 17,976 20,349 20,994 22,533 24,255 25,904 27,615 29,505 31,328 33,201 NITRONIC 50 & 60 Torque T lb.in. 4 4 7 7 12 13 17 20 42 48 86 95 153 173 244 273 372 420 537 599 742 840 1315 1469 2122 2338 3182 3481 31 35 45 50 62 70 110 122 177 195 265 290 376 389 421 530 547 587 695 742 791 922 979 1038 (lb.ft.) Preload Fp lb. 211 231 318 355 490 516 613 700 1,113 1,274 1,834 2,030 2,713 3,073 3,721 4,155 4,967 5,597 6,370 7,105 7,910 8,960 11,690 13,055 16,170 17,815 21,210 23,205 26,705 27,668 29,960 33,915 34,990 37,555 40,425 43,173 46,025 49,175 52,213 55,335 ASTM A453 Gr. 660 Torque T lb.in. 6 7 11 13 20 22 30 34 71 81 146 162 259 294 415 463 633 714 914 1019 1261 1428 2236 2497 3608 3975 5409 5917 53 59 76 85 105 119 186 208 301 331 451 493 638 661 716 901 929 998 1181 1261 1345 1567 1664 1764 (lb.ft.) Preload Fp lb. 359 393 541 604 833 877 1,041 1,190 1,892 2,166 3,118 3,451 4,611 5,224 6,325 7,063 8,443 9,514 10,829 12,079 13,447 15,232 19,873 22,194 27,489 30,286 36,057 39,449 45,399 47,035 50,932 57,656 59,482 63,844 68,723 73,393 78,243 83,598 88,762 94,070
Prepared By: ____________________ Date: __________
Approved By: ____________________
Date: __________ 8/21/2009
Page 6
Sheet4
Calculate Torque vs Axial Load
Nominal Thread Size Threads per Inch Pitch 1/n Lead, ie, Single=1, etc. Lead Diameter Thread PD Nom. Tan a = L / ( p * Dm ) Thread Lead Angle @ Dm D= n= p= L= Dm = Tan a = a= Sin a = Cos a= F= 1.750 4 0.2500 1 0.2500 1.6750 0.047509 2.720016 0.047455 0.998873 14.5 Inches TPI Inches Inches Inches
Degrees
Half of Thread Form Angle Use 30 for V Threads & 14.5 for ACME Threads When Applicable:
Degrees Stub Acme
Type of Acme Threads
COS W = 1 / ( 1 + TAN^2 F + TAN^2 a ) ^ (1/2) COS W = 0.967125 W= 14.732163 Assumptions: Friction Factor Threads f = 0.200 Friction Factor Nut Face fc = 0.050 Hex Size of Nut, Heavy Hex = 2.7500 Mean Diameter of Nut Face Dc = 2.2500 Thread Efficiency Factor e = { [ TAN a * ( COS W - f * SIN a ) ] / [ TAN a * COS W + f * COS a + ( fc * Dc / Dm ) * ( COS W - f * SIN a) ] } e= Assumed Axial Load Fa = 0.146743 1,000 Pounds
Page 7
Sheet4
Torque, Inch Pounds Torque, Foot Pounds
Tip = Tfp =
271 22.6
Inch Pounds Foot Pounds
Page 8
Sheet4
N/A Acme Stub Acme
* SIN a) ] }
Page 9