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Note 1: The torque values listed are residual torque value. This is the torque value and residual stress
after bolt relaxation. The studs and nuts must be clean, free running, free of obvious flaws. The
values listed assume that the nuts are properly lubricated with a lubricant having an
approximate coefficient of friction (µ) 0.15 or k factor of 0.19 such as light weight machine oil. If
a lower coefficient of friction lubricant is used, such as graphite, please contact PLIDCO's
Engineering department for appropriate torque values.
Note 2: The second number is the pitch, which is shown in number of threads per inch.
Note 3: Use the pre-stress value shown for the applicable studbolt size if bolt tensioners are to be used
and follow the bolt tensioner manufacturer's instructions.
Note 4: This chart is also to be used for all PTFE (Teflon) coated studs.
PLIDCO Torque Chart for Clamp/Strongback
Nominal
Diameter
of Studbolt
(inches)
(Note 2)
5/8--11
3/4--10
7/8--9
1--8
1-1/8--8
1-1/4--8
1-3/8--8
1-1/2--8
1-5/8--8
1-3/4--8
1-7/8--8
2--8
2-1/4--8
2-1/2--8
2-3/4--8
3--8
3-1/4--8
3-1/2--8
3-3/4--8
4--8
4-1/4--8
4-1/2--8
4-3/4--8
5--8
5-1/4--8
5-1/2--8
5-3/4--8
6--8
Studs: ASTM A193 Grade B7 - Nuts: ASTM A194 Grade 2H
Wrench
Torque Values for Clamping
Opening
Across Flats
(inches)
ft-lbs
52,500 psi pre-stress
1-1/16
118
1-1/4
206
1-7/16
328
1-5/8
490
1-13/16
719
2
1008
2-3/16
1368
2-3/8
1800
2-9/16
2302
2-3/4
2928
2-15/16
3633
3-1/8
4444
3-1/2
6412
3-7/8
8886
47,500 psi pre-stress
4-1/4
10787
4-5/8
14218
5
18170
5-3/8
22794
5-3/4
28140
6-1/8
34262
37,500 psi pre-stress
6-1/2
32540
6-7/8
38723
7-1/4
45643
7-5/8
53344
8
61864
8-3/8
71245
8-3/4
81529
9-1/8
92761
Page 4 of 4
Section
(Note 1)
0.15 C
f
Nm
160
280
446
664
975
1368
1855
2441
3121
3969
4927
6025
8694
12048
14628
19280
24639
30908
38157
46460
44123
52508
61891
72334
83887
96609
110556
125783
IP-061
Revision 0
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