Torque Settings for Screws
Topic Description

The chart below displays the proper torque specifications for general fastener screws, diode module screws, and transistor module screws which explains how much to tighten each screw.

 
Resolution

Yaskawa drives use Japanese Industry Standard screws (JIS) for the internal components. A Japanese Industrial Standard screwdriver is needed to properly torque the following screws. A Japanese Industry Standard screw looks like a Phillips screw, but is designed not to cam out. It may be damaged by a Phillips screwdriver if tighened too much.

General Fastener Torque Settings

 Thread Torque (N-m)
Nominal  Min-Max
M3 0.55 .050-0.60 
M3.5 0.75 0.70-0.80
M4 1.2 1.0-1.3
M5 2.3 2.0-2.5
M6 4.5 4.0-5.0
M8 10 9.0-11.0
M10 20.5 18.0-23.0
M12 36 32.0-40.0
M16 90 81.0-99.0

Fastener Torque Settings for Diode and Transistor Modules

Thread Pre Torque 1 Pre Torque 2 Final Torque(N-m)
Nominal  Min-Max Nominal  Min-Max Nominal  Min-Max
M4 0.25 0.20-0.30 0.55 0.50-0.60 1.2 1.0-1.3
M5 0.25 0.20-0.30 0.55 0.50-0.60 2.3 2.0-2.5
M6 0.25 0.20-0.30 0.55 0.50-0.60 4.5 4.0-5.0


Related Documents
Screw Tightening Sequence for IGBT Installation
Thermal Compound Type and Application Process for IGBTs and Diode Modules

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Last Modified Date: 07-22-2024ID: 10538