IP-010
Page
13
of
13
Revision 3
PLIDCO Torque Chart for Clamp+Sleeve
Nominal
Diameter
of Stud
(inches)
(see Note 2)
Wrench
Opening
Across
Flats
(inches)
Torque Values for
Sealing Section
(Note 1)
Torque Values for
Clamping Section
(Note 1)
0.15 C
f
0.15 C
f
ft-lbs
Nm
ft-lbs
Nm
25,000 psi pre-stress
52,500 psi pre-stress
5/8
1-1/16
56
76
118
160
3/4
1-1/4
98
133
206
280
7/8
1-7/16
156
212
328
446
1
1-5/8
233
316
490
664
1-1/8
1-13/16
342
464
719
975
1-1/4
2
480
651
1000
1370
1-3/8
2-3/16
651
883
1400
1860
1-1/2
2-3/8
857
1160
1800
2440
1-5/8
2-9/16
1110
1490
2300
3120
1-3/4
2-3/4
1390
1890
2900
3970
1-7/8
2-15/16
1730
2350
3600
4930
2
3-1/8
2120
2870
4400
6030
2-1/4
3-1/2
3050
4140
6400
8700
2-1/2
3-7/8
4230
5740
8900
12000
23,000 psi pre-stress
47,500 psi pre-stress
2-3/4
4-1/4
5220
7080
10800
14600
3
4-5/8
6890
9340
14200
19300
3-1/4
5
8800
11900
18200
24600
3-1/2
5-3/8
11000
15000
22800
30900
3-3/4
5-3/4
13600
18500
28100
38200
4
6-1/8
16600
22500
34300
46500
18,800 psi pre-stress
37,500 psi pre-stress
4-1/4
6-1/2
16300
22100
32500
44100
4-1/2
6-7/8
19400
26300
38700
52500
4-3/4
7-1/4
22900
31000
45600
61900
5
7-5/8
26700
36300
53300
72300
5-1/4
8
31000
42100
61900
83900
5-1/2
8-3/8
35700
48400
71200
96600
5-3/4
8-3/4
40900
55400
81500
110600
6
9-1/8
46500
63000
92800
125800
Studs: ASTM A193 Grade B7 - Nuts: ASTM A194 Grade 2H
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 stud 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.