# Flange Bolting Torque Table 4

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 4 / Torque FT-LBS - Use only with 6061-T6 Aluminium flanges BOLT DIA Torque FT-LBS 30% Initial Torque 70% Torque 100% Final Torque 1/2 10 15 25 9/16 10 25 35 5/8 15 35 50 3/4 25 60 90 7/8 40 100 140 1 65 150 215 1.1/8 95 220 315 1.1/4 130 305 440 1.3/8 175 415 595 1.1/2 230 540 770 1.9/16 265 620 885 1.5/8 300 700 1000 1.3/4 375 875 1250 1.7/8 465 1085 1550 2 565 1320 1885 2.1/4 815 1900 2715 2.1/2 1125 2625 3750 2.3/4 1500 3515 5020 3 1970 4595 6565

 Table 4 / Torque Nm - Use only with 6061-T6 Aluminium flanges BOLT DIA Torque Nm 30% Initial Torque 70% Torque 100% Final Torque 1/2 14 20 34 9/16 14 34 47 5/8 20 47 68 3/4 34 81 122 7/8 54 136 190 1 88 203 292 1.1/8 129 298 427 1.1/4 176 414 597 1.3/8 237 563 807 1.1/2 312 732 1044 1.9/16 359 841 1200 1.5/8 407 949 1356 1.3/4 508 1186 1695 1.7/8 630 1471 2102 2 766 1790 2556 2.1/4 1105 2576 3681 2.1/2 1525 3559 5084 2.3/4 2034 4766 6806 3 2671 6230 8901

Notes..

• Bolting torque to develop 25,000 PSI Bolt 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 for all Stud Bolts listed in Doc No... Do not use at temperatures exceeding 350°F (175°C).
• The torque values are approved for gaskets with a low seating stress such as elastomer gaskets.

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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