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Recommended torque values for flange bolting (US Customary units)

Reference: API Specification 6A/ISO 10423 (Appendix D page 294 Nineteenth Edition)
Stud diameter Threads per in. Studs with Sy = 80 ksibolt stress = 40 ksi Studs with Sy = 105 ksibolt stress = 52.5 ksi Studs with Sy = 95 ksibolt stress = 47.5 ksi
    Tension Torque Torque Tension Torque Torque Tension Torque Torque
D N F ƒ=0.07 ƒ=0.13 F ƒ=0.07 ƒ=0.13 F ƒ=0.07 ƒ=0.13
in 1/in lbf ft·lbf ft·lbf lbf ft·lbf ft·lbf lbf ft·lbf ft·lbf
1/2 13 5,676 27 45 7,450 35 59 - - -
5/8 11 9,040 52 88 11,865 68 115 - - -
3/4 10 13,378 90 153 17,559 118 200 - - -
7/8 9 18,469 143 243 24,241 188 319 - - -
1 8 24,230 213 361 31,802 279 474 - - -
1  1/8 8 31,618 305 523 41,499 401 686 - - -
1  1/4 8 39,988 421 726 52,484 553 953 - - -
1  3/8 8 49,340 563 976 64,759 739 1,281 - - -
1  1/2 8 59,674 733 1,278 78,322 962 1,677 - - -
1  5/8 8 70,989 934 1,635 93,173 1,226 2,146 - - -
1  3/4 8 83,286 1,169 2,054 109,313 1,534 2,696 - - -
1  7/8 8 96,565 1,440 2,539 126,741 1,890 3,332 - - -
2 8 110,825 1,750 3,094 145,458 2,297 4,061 - - -
2  1/4 8 142,292 2,496 4,436 186,758 3,276 5,822 - - -
2  1/2 8 177,685 3,429 6,118 233,211 4,500 8,030 - - -
2  5/8 8 - - - - - - 233,765 4,716 8,430
2  3/4 8 - - - - - - 257,694 5,424 9,712
3 8 - - - - - - 309,050 7,047 12,654
3  1/4 8 - - - - - - 365,070 8,965 16,136
3  3/4 8 - - - - - - 491,099 13,782 24,904
3  7/8 8 - - - - - - 525,521 15,208 27,506
4 8 - - - - - - 561,108 16,730 30,282
         Reference API 6A 19th Edition

Enerpac Nut to Stud Size Chart
Enerpac Nut to Stud Size Chart

Please refer to API TR 6AF, TR 6AF1, TR 6AF2, API Spec 6FA for flange performance of bolt preload stress and other factors

A few factors to consider with stud-stress and nut torque relationship:

1. Form and thread dimensions
2. Flange face, nut and stud surface finish
3 Thread coatings, lubrication type and nut bearing surface areas.



Two friction coefficients are used in the chart. 0.07 and 0.13

Use 0.07 when threads, nut face are coated with fluoropolymer material
Use 0.13 when material in question is bare metal and is well-lubricated with thread compound meeting ISO 13678

The most commonly used materials meet ASTM A 193 Grades B7 and B7M. If other materials are to be used, Torque values can be calculated by taking the ratio of the new material's yield strength to the calculated material's yield strength.



Use only Heavy-duty Impact Sockets for power driven torqueing equipment, according to ISO 2725 and ISO 1174; DIN 3129 and DIN 3121 or ASME-B107.2/1995.

OZAT Sockets, made in Israel, have proven to be the toughest, stongest, longest lasting socket in the market and no other manufacturer offers as wide of a selection of sockets. Down Laod Catalog 2 MB
All Torque Related Equations
Torque Equations and related values
A is the stress area, D is the thread major diameter, E is the pitch diameter of thread, F is the force per stud, f is the freiction coefficient, H is the hex size nut, K is the nut internal chamfer, P is the thread pitch divided by the number of threads per unit length, S is the secant 30 degrees = 1.1547 T is the torque, sigma is the stress in the stud

 

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801-487-0624

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