Flexitallic Torque Chart - Flexpro Gaskets
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1Flexpro
Class 150
Class 300
Class 400
Class 600
NPS
(in.)
MinTorque
Max Torque
MinTorque
Max Torque
MinTorque
Max Torque
MinTorque
Max Torque
0.5
15
50
30
45
30
40
30
45
0.75
15
50
30
80
60
80
60
80
1
15
60
30
90
60
80
60
85
1.25
30
60
50
120
60
100
60
120
1.5
30
60
65
200
100
135
100
200
2
60
120
45
120
60
80
60
120
2.5
60
120
65
200
100
135
100
180
3
90
120
90
200
100
175
100
200
3.5
60
120
100
200
160
225
160
320
4
75
120
100
200
160
290
160
320
5
100
200
100
200
160
320
245
490
6
120
200
100
200
160
320
245
490
8
160
200
160
300
245
490
355
710
10
160
320
240
490
355
586
500
940
12
160
320
300
710
500
770
500
900
14
280
490
300
710
500
670
680
1070
16
245
490
420
1000
680
1005
800
1370
18
360
710
420
1000
680
1110
1100
2050
20
360
710
500
1000
800
1185
1100
1880
24
500
1000
650
1600
1500
2140
2000
2940
Class 900
Class 1500
Class 2500
NPS
Min Torque
Max Torque
Min Torque
Max Torque
Min Torque
Max Torque
0.5
70
120
70
120
50
100
0.75
70
120
70
120
70
100
1
110
190
110
190
105
160
1.25
110
190
110
190
210
245
1.5
165
290
170
290
290
355
2
110
190
110
190
185
245
2.5
165
290
170
290
255
355
3
125
200
245
355
445
500
4
240
415
400
500
700
800
5
350
585
560
800
1240
1500
6
285
455
520
680
1835
2200
8
480
795
805
1100
1700
2200
10
500
795
1480
2000
2915
4400
12
535
795
1470
2200
4295
5920
14
600
935
2120
3180
16
895
1285
2935
4400
18
1520
2335
3950
5920
20
1720
2570
5150
7720
24
2950
5135
8335
12500
Notes:
Torque Values are in ft.-lbs., and assume Alloy Steel Bolts (A193 B7 w/ 2H Nuts) with oil/graphite lubrication.
(Nut factors used on these charts are within .15 to .19)
Flexitallic does not generally recommend a bolt stress above 60,000 PSI
Torque values limit minimum and maximum gasket seating stresses based upon pressure class and certain operating conditions.(i.e: maximum pressure ratings for given
pressure class,not hydrotest pressure). Extreme operating conditions such as high temperature may reduce bolt yield strength. Caution should be used in these
applications. The above torque values are for general use only. For critical or extreme applications (high temperature/pressure) consult with Flexitallic engineering.
Flexitallic does not accept responsibility for the misuse of this information.
This document is property of Flexitallic L P and is not to be reproduced transmitted to another nor used for the purpose of manufacturing of articles for sale to anyone but Flexitallic
This document is property of Flexitallic L.P and is not to be reproduced, transmitted to another, nor used for the purpose of manufacturing of articles for sale to anyone but Flexitallic,
L.P. without Flexitallic's specific written permission.
09/2013
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