6.6.10.2 Maximum torque values for fasteners
About this table
The torque values specified in this table are for lubricated threads. These values should be increased for
dry threads only. Materials listed in this table are equal to the respective API 610, 12th Edition material
classes. In some cases, superior materials are substituted.
Preload and Torque for Metal-to-Metal Joints, 300 Series Stainless Steel Fasteners
Table 14: Goulds 2226, 2228, 2229, ASTM A193 B8 and B8M, ASTM A276 Tp 304, ASTM A582 Tp
303, SAE F593
Bolt Dia. (D) in.
- threads/inch
Tensile Stress
Area (Ab),
(sq-in)
2226, 2228: 303, 304SS, SAE F593
Group 1 2229: 316SS, SAE F593
Group 2 Yield strength:
65000 psi for 0.25<=dia<=0.625
45000 psi for 0.75<=dia<=1.5
A193 B8, B8M Cl 1, A276 Tp 304,
A582 Tp 303
Yield strength=30000 psi
Ultimate tensile=75000 psi
Max preload (lbs,) Torque (ft-lb) Nickel
or Moly Anti-seize
K=0.15
Max preload
(lbs)
Torque (ft-lb)
Nickel or Moly An-
ti-seize K=0.15
1/4-20
0.0318
1447
5
668
2
5/16-18
0.0524
2384
9
1100
4
3/8-16
0.0775
3526
17
1628
8
7/16-14
0.1063
4837
26
2232
12
1/2-13
0.1419
6456
40
2980
19
9/16-12
0.1819
8276
58
3820
27
5/8-11
0.226
10283
80
4746
37
3/4-10
0.3345
10537
99
7025
66
7/8-9
0.4617
14544
155
9696
103
1-8
0.6058
19083
239
12722
159
1.125-7
0.7633
24044
338
16029
225
1.125-8
0.7904
24898
350
16598
233
1.25-7
0.9691
30527
477
20351
318
1.25-8
1.000
31500
492
21000
328
1.375-6
1.155
36383
625
24255
417
1.375-8
1.234
38871
668
25914
445
1.5-6
1.405
44258
830
29505
553
1.5-8
1.492
46998
881
31332
587
1.5-12
1.581
49802
934
33201
623
1.625-8
1.775
55913
1136
37275
757
1.75-5
1.899
59819
1309
39879
872
1.75-8
2.082
65583
1435
43722
956
1.875-8
2.414
76041
1782
50694
1188
2-4.5
2.498
78687
1967
52458
1311
2-8
2.771
87287
2182
58191
1455
2.125-8
3.152
99288
2637
66192
1758
2.25-4.5
3.248
102312
2878
68208
1918
2.25-8
3.557
112046
3151
74697
2101
2.375-8
3.987
125591
3728
83727
2486
6.6 Reassembly
Model 3700i API610 / Type OH2 Installation, Operation, and Maintenance Manual
111