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User Manual QT series generation 2.5, ID 2021, rev 3.2, January 14, 2022
Page
83 of 88
The following table lists recommended torque values and minimum thread
engagement when mounting the Eltorque actuators.
Table 16: Screw torque
Thread
size
Tightening
torque.
(Nm)
Min. thread
engagement.
(mm/in.)
M4
3.4
NA
M5
5.1
7.5/0.30
M6
8.9
9/0.35
M8
21.1
12/0.47
M10
41.5
15/0.59
M12
70.7
18/0.70
M16
172.6
24/0.94
M20
336.2
30/1.18
•
Use A4-80 screw material and quality.
•
Use a washer between the bolt head and the mounting flange.
Requirements: DIN 125A, minimum 200HV, A4.
•
Lubricate washer surface and underside of the bolt head with a lubricant
resulting in a friction coefficient of 0.08 to 0.14 between bolt head and
washer. The lubricant must not contain aluminum, zinc or copper. To
prevent galling when using stainless steel fasteners, a lubricant
containing MoS
2
is recommended.
•
Use thread lock Loctite 222 or similar on bolt threads. Be sure that the
amount applied is enough, so no water can get into thread holes after
the bolt is inserted. The thread-locks main purpose in this application is
to serve as a barrier, preventing seawater from acting as a catalyst
between bolts and threads in the actuator base.
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