Hi, I checked the CAD file of a bracket. According to SW, it is "CSK for M2 Flat Head Machine" ANSI B18.6.7M M2, 2.6mm, 5.6mm, 90degrees. In this case, what screw do I need to buy? Any suggestions on good place to buy in North America?
Peter Cohen wrote: I have the actual motor and the non-countersink screws (M2.5x4) that came with the motor fit the holes on the motors. So perhaps I should go for M2.5x4 or M2.5x6? suspect that the parameters in the CAD model may be wrong.
Peter Cohen wrote:
I have the actual motor and the non-countersink screws (M2.5x4) that came with the motor fit the holes on the motors. So perhaps I should go for M2.5x4 or M2.5x6? suspect that the parameters in the CAD model may be wrong.
The length of a SHCS is measure from beneath the head. The length of a FHCS is measured from the top of the head. For design purposes a FH screw is flush with the surface of the plate. If you have a proper countersink then you could replace the M2.5 x 4 SHCS with an M2.5 x 4 FHCS. I recommend a Torx Plus drive, McMaster-Carr P/N 90236A110.
It is to connect a bracket to a motor that has holes of type: M2.5x .45 TAP DP 3.0.
You have a contradiction on your hands. The threaded hole calls for one size and the countersunk hole calls for a different size.
Thanks for your reply. Yes, there is something strange. The motor holes are M2.5 but SW reported that the screw holes on the brackets are M2!
The motor came with WB M2.5*4 screws. I have 3D printed the two brackets and used the screws to mount on the motor. Except for the countersink head part, the screws could connect the brackets to the motor. I have taken snapshot for your reference. Could you please have a look?
Given the conflict in information, is the best course of action to get a set of countersink flat head philip screws of size M2, M2.5 and M3 and lengths between 4 to 6mm?
What do you have available? Do you have the actual motor with its tapped holes? If you have anything physical to measure you can narrow down your search. If you have CAD files you should be able to make some measurements for length, head diameter, hole diameter, etc. and determine the screw needed.
McMaster-Carr is my go-to website for getting the supporting information.
Thanks. To verify, I just inserted a WB M2.5x6 mm screws (6mm is measured from the top of the big head to the bottom of the screw with measured nominal length about 4mm) into the motor. Without a bracket in between there is a 1mm gap between the base of the big head and the surface of the motor. If I use countersink screw, is 90236A110 still the one to choose?
Is the holes on the motor through?
M2 long enough to go through the motor.
Or M2.5 to thread into motor tap hole.
I have to use a wrench to screw the M2.5 in.
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