Flange 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) 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 2 / Torque FT-LBS - ASTM 193 Grade B7 and ASTM 193 Grade B16 Stud Bolts
BOLT DIA	Torque Ft*lb
	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
1.1/4	288	672	960
1.3/8	391	915	1305
1.1/2	518	1208	1725
1.9/16	588	1372	1960
1.5/8	668	1558	2225
1.3/4	840	1960	2800
1.7/8	1044	2436	3480
2	1280	2985	4265
2.1/4	1850	4315	6165
2.1/2	2565	5985	8550
2.3/4	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 N*m
	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
1.1/4	390	911	1302
1.3/8	530	1241	1769
1.1/2	702	1638	2339
1.9/16	797	1860	2657
1.5/8	906	2112	3017
1.3/4	1139	2657	3796
1.7/8	1415	3303	4718
2	1735	4047	5783
2.1/4	2508	5850	8359
2.1/2	3478	8115	11592
2.3/4	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 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.
• This Table is not acceptable for PTFE coated Stud Bolts and nuts, for these refer to Table 5.

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