Flange Guide

# Flange Bolt-Up Bolting Torque Table 2

The torque tables are built on specific assumptions regarding bolt and nut factor. Before using a given torque table, these assumptions should be verified to insure they are appropriate for the specific application.

Even if all assumptions are appropriate, results may vary depending on actual conditions. Many factors induce scatter in the results or increase the inherent variability in the bolting process. These include variations in the nut factor; bolt, flange and nut condition; equipment calibration and condition; perpendicularity of the bolt, nut and flange; etc.

The values in the tables are based on the equation:

T = Torque value, (ft-lbs)
k = Nut Factor based on lubricant used
d = Nominal bolt diameter, (in.)

The nut factor is not the coefficient of friction.
It is an experimentally derived constant that includes the impact of friction.

ft-lbs to nm = 0.737562149277
nm to ft-lbs = 1.3558179

 Table 2 / Torque FT-LBS - ASTM 193 Grade B7 and ASTM 193 Grade B16 Stud Bolts BOLT DIA Torque FT-LBS 30% Initial Torque 70% Torque 100% Final Torque 1/2 17 39 55 9/16 24 55 80 5/8 33 77 110 3/4 59 137 195 7/8 93 217 310 1 140 325 465 1.1/8 205 480 685 1¼ 288 672 960 1.3/8 391 915 1305 1½ 518 1208 1725 1.9/16 588 1372 1960 1.5/8 668 1558 2225 1¾ 840 1960 2800 1.7/8 1044 2436 3480 2 1280 2985 4265 2¼ 1850 4315 6165 2½ 2565 5985 8550 2¾ 3121 7282 10400 3 4080 9520 13600
 Table 2 / Torque Nm - ASTM 193 Grade B7 and ASTM 193 Grade B16 Stud Bolts BOLT DIA Torque Nm 30% Initial Torque 70% Torque 100% Final Torque 1/2 23 53 75 9/16 33 75 108 5/8 45 104 149 3/4 80 186 264 7/8 126 294 420 1 190 441 630 1.1/8 278 651 929 1¼ 390 911 1302 1.3/8 530 1241 1769 1½ 702 1638 2339 1.9/16 797 1860 2657 1.5/8 906 2112 3017 1¾ 1139 2657 3796 1.7/8 1415 3303 4718 2 1735 4047 5783 2¼ 2508 5850 8359 2½ 3478 8115 11592 2¾ 4232 9873 14101 3 5532 12907 18439

Notes:

• Bolting torque to develop 50% Bolt Yield Stress at Nut Factor, K=0.16
• This Table is applicable to Never-Seize paste and Fel-Pro lubricant, K=0.16.
• The above Table is applicable only for ASTM A320 Grade L7, A193 Grade B7 and A193 Grade B16 Stud Bolts.
• The torque values are approved for spiral wound graphite and PTFE filled gaskets, graphite sheet gaskets GHE and GHR types, ring joint, double jacketed and Camprofile gaskets with graphite and PTFE lining.
• The Final Torque Value accounts for 10% bolt relaxation.
• This Table is not acceptable for PTFE coated Stud Bolts and nuts, for these refer to Table 5.
PP

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