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9.1
Tightening torques
9.1.1 Tightening torques
Observe the tightening torques given for the size and material of screwed
connections.
Table 17: Tightening torques
Thread
Tightening torque
[Nm]
Tightening torque
[ftlb]
A193 B8M
CL2
A193 B7
8.8
A193 B8M
CL2
A193 B7
8.8
M 6
6 - 7
9 - 10
8 - 9
4.5 - 5.1
6.5 - 7
6 - 6.5
M 10
33 - 35
44 - 47
38 - 41
24 - 25.5
32 - 34
28 - 30
M 12
55 - 60
75 - 80
67 - 71
42 - 45
55 - 58
50 - 53
M 16
140 - 150
190 - 200
165 - 175
105 - 112
138 - 147
122 - 129
M 20
275 - 295
365 - 385
-
205 - 217
270 - 286
-
M 24
395 - 420
630 - 670
-
292 - 310
464 - 493
-
M 30
650 - 690
1270 - 1340
-
480 - 511
934 - 993
-
M 36
875 - 925
2210 - 2340
-
642 - 680
1628 - 1730
-
9.1.2 Tightening torques for flange bolts
Bolts for flange connection at suction nozzle, discharge nozzle and tapping nozzle:
The tightening torques only apply to bolts included in KSB's scope of supply.
Table 18: Tightening torques for flange bolting
Nominal diameter
[inch]
Nominal pressure
PN class
Torque
[Nm]
Tightening torque
[ftlb]
1/2"
600
35
26
300
22
16
3/4"
600
63
46
300
40
29
2"
600
90
66
300
52
38
3"
600
120
88
300
105
77
4"
600
210
155
300
143
105
6"
600
350
258
300
175
127
8"
600
460
339
300
280
206
10"
600
650
479
300
302
222
NOTE
Observe the drawing in the next section! (⇨ Section 9.1.3 Page 68)
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