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
2.5-4
3.999
125969
3937
83979
2624
2.5-8
4.442
139923
4373
93282
2915
2.625-8
4.921
155012
5086
103341
3391
2.75-4
4.934
155421
5343
103614
3562
2.75-8
5.425
170888
5874
113925
3916
2.875-8
5.953
187520
6739
125013
4493
3-4
5.967
187961
7049
125307
4699
3-8
6.506
204939
7685
136626
5123
NOTICE:
1.
Prestress = 0.7*yield strength
2.
Max preload = prestress* tensile stress area
3.
The preload and torque given in this table may need to be adjusted to account for spe-
cial conditions, such as gaskets
6.6.10.3 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 Carbon Steel Fasteners
Table 15: Goulds 2210, 2294, ASTM A307 Gr B, SAE Gr 2
Bolt Dia. (D) in. - threads/
inch
Tensile Stress Area
(Ab), (sq-in)
Max preload (lbs)
Torque (ft-lb) Nickel or
Moly Anti-seize, K=0.15
1/4-20
0.0318
801
3
5/16-18
0.0524
1320
5
3/8-16
0.0775
1953
9
7/16-14
0.1063
2679
15
1/2-13
0.1419
3576
22
9/16-12
0.1819
4584
32
5/8-11
0.226
5695
44
3/4-10
0.3345
8429
79
7/8-9
0.4617
11635
124
1-8
0.6058
15266
191
1.125-7
0.7633
19235
270
1.125-8
0.7904
19918
280
6.6 Reassembly
112
Model 3700i API610 / Type OH2 Installation, Operation, and Maintenance Manual