Nema23 Stepper Motor Mount Base 57 Stepping Motor Bracket Clamp Support Holder with 4pcs Installation Screws Aluminium Oxide for CNC Router Machine

This is correct. The height should be 40mm high.

In case you are interested, you can find the NEMA23 series of drawings if you Google "NEMA23 dimensions".

Although I am not sure what the thread pitch of the screws is, there are three thread pitches for 5mm, and they are 1, 2, and 3. A zero and a zero The numbers 9 and 0 are substituted. A breech opening is 8mm wide. Metric bolts do not have threads per millimeter, but are pitched by the space between each thread. A micrometer will allow you to measure the distance between two threads and get the answer you need. If you do not have a sizer handy, you can take the screw to your local hardware store to be sized It might help if you read this.

You can use it with nema23 motors as long as the frame is nema23. Fortunately, the stepper motor is already mounted in the nema23 frame, so you should be all set.