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