15-1
EB|LTR|43_EN
May 2023 edition
Subject to technical changes
Annex
15 Annex
15.1 Tightening torques, lubricant and tools
15.1.1 Tightening torques
15.1.1.1 Bonnet, seat, seat ring, clamping
ring, retaining plate, shaft,
extension and bracket
Table|15-1: The tightening torques apply for materials A2-70,
1.4980, Monel K500 and 1.4462
Thread
size
Max. torque [Nm] for
screws according to
DIN|7984 (low head),
see|Figure 1
Max. torque [Nm] for
screws according to
ISO|4762 (high head),
see|Figure 2
M6 7.3 9.1
M8 17.5 21.8
M10 35 44
M12 60 75
M16 144 180
M20 296 370
M24 486 608
M27 336 421
M30 457 571
M33 623 779
The values in the table according to technical data sheet
LW-10017, Annex 15.2, apply for lubricated threads
Figure|15-1: Screw according
toDIN 7984
Figure|15-2: Screw according
toISO 4762
15.1.1.2 Stuffi ng box nuts (standard)
Values in the following table according to technical data sheet
LW-10006
Table|15-2: PN 10 / 16 / 25 and cl150 (max. 28bar)
Nominal size
Stuffi ng
box
Ø shaft
Graphite
packing
M
min.
[Nm]
PTFE
packing
M
min.
[Nm]
Max. per-
missible
M
max.
[Nm]
NPS DN
380M10 20 6 8 35
4 100 M10 20 6 8 35
6 150 M12 25 14 18 60
8 200 M12 25 14 18 60
10 250 M12 30 16 20 60
12 300 M12 35 18 23 60
14 350 M16 40 27 34 144
16 400 M16 50 33 41 144
18 450 M16 50 33 41 144
20 500 M20 60 48 60 296
24 600 M20 70 75 94 296
28 700 M20 70 75 94 296
30 750 M20 70 75 94 296
32 800 M20 80 85 106 296
36 900 M20 80 85 106 296
40 1000 M24 100 125 156 486
Table|15-3: PN 40 and cl300 (max. 55bar)
Nominal size
Stuffi ng
box
Ø shaft
Graphite
packing
M
min.
[Nm]
PTFE
packing
M
min.
[Nm]
Max. per-
missible
M
max.
[Nm]
NPS DN
380M10 20 6 8 35
4 100 M12 25 14 18 60
6 150 M12 30 16 20 60
8 200 M12 35 18 23 60
10 250 M16 40 27 34 144
12 300 M16 50 33 41 144
14 350 M20 60 48 60 296
16 400 M20 70 75 94 296
18 450 M20 70 75 94 296
20 500 M20 80 85 106 296
24 600 M24 100 125 156 486
28 700 M33 110
Upon request
30 750 M24 120
32 800 M30 130
36 900 M30 130
40 1000 M30 130
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