6.3 Torque values
All screws and nuts must be lubricated to achieve correct tightening torque. Screws that are
screwed into stainless steel must have the threads coated with applicable lubricants to
prevent seizing.
If there is a question regarding the tightening torques, then contact a sales or authorized
service representative.
Screws and nuts
Table 1: Stainless steel, A2 and A4, torque Nm (lbf·ft)
Property
class
M4 M5 M6 M8 M10 M12 M16 M20 M24 M30
50 1.0
(0.74)
2.0
(1.5)
3.0
(2.2)
8.0
(5.9)
15
(11)
27
(20)
65
(48)
127
(93.7)
220
(162)
434
(320)
70, 80 2.7
(2)
5.4
(4)
9.0
(6.6)
22
(16)
44
(32)
76
(56)
187
(138)
364
(268)
629
(464)
1240
(915)
100 4.1
(3)
8.1
(6)
14
(10)
34
(25)
66
(49)
115
(84.8)
248
(183)
481
(355)
— —
Table 2: Steel, torque Nm (lbf·ft)
Property
class
M4 M5 M6 M8 M10 M12 M16 M20 M24 M30
8.8 2.9
(2.1)
5.7
(4.2)
9.8
(7.2)
24
(18)
47
(35)
81
(60)
194
(143)
385
(285)
665
(490)
1310
(966.2)
10.9 4.0
(2.9)
8.1
(6)
14
(10)
33
(24)
65
(48)
114
(84)
277
(204)
541
(399)
935
(689)
1840
(1357)
12.9 4.9
(3.6)
9.7
(7.2)
17
(13)
40
(30)
79
(58)
136
(100)
333
(245)
649
(480)
1120
(825.1)
2210
(1630)
Table 3: Brass, torque Nm (lbf·ft)
M5 M8 M10
2.7 (2.0) 11
(8.1)
22
(16.2)
Hexagon screws with countersunk heads
For hexagon socket head screws with countersunk head, maximum torque for all property
classes must be 80% of the values for property class 8.8.
Round nuts with set screws
Table 4: Set screw, torque Nm (lbf·ft)
The torque values are only valid for the set screw, and not for the round nut.
M8 M10
18 (13) 35 (26)
6.4 Change the oil
This image shows the plug that is used to change the oil.
6 Maintenance
Flygt 3069 Installation, Operation, and Maintenance Manual 39
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