Ordering Information and Recommended Spare Parts
User Manual QT50 Doc ID 1321 version 2.0 Sept. 2018
Page 57 of 62
Torque and Screw
Recommendations
A. 1. Eltorque torque recommendations
The following table lists recommended torque values and minimum thread
engagement when mounting the Eltorque actuators.
Table 13: Screw torque
Thread
size
Tightening
torque.
(Nm)
Min. thread
engagement.
(mm/in.)
M5 5.1 7.5/0.30
M6 8.9 9/0.35
M10 41.5 15/0.59
M12 70.7 18/0.70
M16 172.6 24/0.94
M20 336.2 30/1.18
A. 2. Mounting screws and lubrication
Use A4-80 screw material and quality.
Use washer under bolt head/between bolt head and mounting flange.
Requirements: DIN 125A, minimum 200HV, A4.
Lubricate washer surface and underside of bolt head with a lubricant
resulting with a friction coefficient 0,08 to 0,14 between bolt head and
washer. Lubricant shall not contain aluminum, zinc or copper. To prevent
galling when using stainless steel fasteners, 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-lock’s main purpose in this application is to serve
as a barrier, preventing sea-water to act as a catalyst between bolts and
threads in the actuator base.
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