Danfoss VLT FC Series, Service Manual

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14 Product Specifications
14.1 Fastener Torque Ratings
14.1.1 General Torque Tightening Values
Use a torque wrench to ensure that correct torque is
applied. Incorrect torque can cause electrical connection
problems. For fastening hardware described in this guide,
use the values listed in
Table 14.1 to Table 14.3 .
NOTICE
TORQUE VALUES
The torque values in the following tables are not
intended for SCR, diode, or IGBT fasteners. Refer to the
instructions included with those replacement parts for
correct values.
Shaft
size
Torx/hex
drives size
Class A
Nm (in-lb)
Class B
Nm (in-lb)
M4 T20/7 mm 1.2 (10) 0.8 (7)
M5 T25/8 mm 2.3 (20) 1.2 (10)
M6 T30/10 mm 3.9 (35) 2.3 (20)
M8 T40/13 mm 9.6 (85) 3.9 (35)
M10 T50/17 mm 19.1 (169) 9.6 (85)
M12 –/18 mm or
19 mm
37.9 (335) –
Table 14.1 Torque Values Standard Thread
Shaft
size
Torx drives
size
Class A
Nm (in-lb)
Class B
Nm (in-lb)
M4.8 T25 5.7 (50) 3.1 (27)
M5 T25 1.7 (15) 1.7 (15)
Table 14.2 Torque Values for Thread-cutting into Metal
Shaft
size
Torx drives
size
Class A
Nm (in-lb)
Class B
Nm (in-lb)
M4 T20 2.8 (24) 2.8 (24)
M5 T25 5.1 (45) 4.0 (35)
Table 14.3 Torque Values for Thread-forming into Plastic
Class A: Clamping metal
Class B: Clamping PCA or plastic
Product Specifications Service Guide
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