# Flange Bolting Torque Table 5

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) F = Bolt pre-load, (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 5 / Torque FT-LBS - PTFE coated ASTM A193 B7 and ASTM 193 B16 Stud Bolts BOLT DIA Torque Ft*lb 30% Initial Torque 70% Torque 100% Final Torque 1/2 12 29 41 9/16 18 41 59 5/8 24 57 82 3/4 43 101 145 7/8 70 163 233 1 105 245 350 1.1/8 154 359 513 1.1/4 217 505 722 1.3/8 294 685 979 1.1/2 388 905 1292 1.9/16 441 1030 1471 1.5/8 501 1169 1670 1.3/4 631 1471 2102 1.7/8 783 1827 2610 2 960 2240 3199 2.1/4 1388 3238 4626 2.1/2 1923 4487 6410 2.3/4 2341 5462 7802 3 3061 7143 10204

 Table 5 / Torque Nm - PTFE coated ASTM A193 B7 and ASTM 193 B16 Stud Bolts BOLT DIA Torque N*m 30% Initial Torque 70% Torque 100% Final Torque 1/2 16 39 56 9/16 24 56 80 5/8 33 77 111 3/4 58 137 197 7/8 95 221 316 1 142 332 475 1.1/8 209 487 696 1.1/4 294 685 979 1.3/8 399 929 1327 1.1/2 526 1227 1752 1.9/16 598 1396 1994 1.5/8 679 1585 2264 1.3/4 856 1994 2850 1.7/8 1062 2477 3539 2 1302 3037 4337 2.1/4 1882 4390 6272 2.1/2 2607 6084 8691 2.3/4 3174 7405 10578 3 4150 9685 13835

Notes..

• Bolting torque to develop 50% Bolt Yield Stress at Nut Factor, K=0.12
• This Table is applicable for PTFE coated bolts with K=0.12.
• The above Table is applicable only for A193 Grade B7 and A193 Grade B16 Stud Bolts.
• The torque values are approved for spiral wound graphite and PTFE filled gaskets.
• The Final Torque Value accounts for 10% bolt relaxation.

OTHER BOLTING TORQUE TABLES

BOLTING TORQUE TABLE 1 - ASTM A193 AND ASTM A320 GRADE B8, CL2 STUD BOLTS

BOLTING TORQUE TABLE 1A - COLD SERVICE ASTM A193 AND ASTM A320 GRADE B8, CL2 STUD BOLTS

BOLTING TORQUE TABLE 2 - ASTM 193 GRADE B7 AND ASTM 193 GRADE B16 STUD BOLTS

BOLTING TORQUE TABLE 2A - COLD SERVICE ASTM A320 GRADE L7 STUD BOLTS

BOLTING TORQUE TABLE 3 - USE ONLY WITH A193 B8, CL1 BOLTS AT 540°C - 650°C ON UNINSULATED FLANGES

BOLTING TORQUE TABLE 4 - USE ONLY WITH 6061-T6 ALUMINIUM FLANGES

BOLTING TORQUE TABLE 5 - PTFE COATED ASTM A193 B7 and ASTM 193 B16 STUD BOLTS

BOLTING TORQUE TABLE 5A - COLD SERVICE PTFE COATED ASTM A320 GRADE L7 STUD BOLTS

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