Flange Bolting Torque Table 5A

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 5A / Torque FT-LBS - Cold Service PTFE coated ASTM A320 Grade L7 Stud Bolts BOLT DIA Torque FT-LBS 30% Initial Torque 70% Torque 100% Final Torque 1/2 17 40 57 9/16 25 58 83 5/8 34 80 114 3/4 61 142 203 7/8 98 229 327 1 147 343 490 1.1/8 216 503 719 1.1/4 303 707 1011 1.3/8 411 959 1371 1.1/2 543 1267 1809 1.9/16 618 1441 2059 1.5/8 702 1637 2339 1.3/4 883 2060 2943 1.7/8 1096 2557 3653 2 1344 3135 4479 2.1/4 1943 4533 6476 2.1/2 2692 6282 8974

 Table 5A / Torque Nm - Cold Service PTFE coated ASTM A320 Grade L7 Stud Bolts BOLT DIA Torque Nm 30% Initial Torque 70% Torque 100% Final Torque 1/2 23 54 77 9/16 34 79 113 5/8 46 108 155 3/4 83 193 275 7/8 133 310 443 1 199 465 664 1.1/8 293 682 975 1.1/4 411 959 1371 1.3/8 557 1300 1859 1.1/2 736 1718 2453 1.9/16 838 1954 2792 1.5/8 952 2219 3171 1.3/4 1197 2793 3990 1.7/8 1486 3467 4953 2 1822 4250 6073 2.1/4 2634 6146 8780 2.1/2 3650 8517 12167

Notes..

• Bolting torque to develop 70% 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 ASTM A320 Grade L7.
• 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.

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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