10-32 screw on a 10-24 tapped hole

[bernardg]

Hello,

Our motors call for a 10-24 tapped hole on the endframes, and a 10-24 screw is driven into it to mount the motors into the unit.Accidentaly, we used a 10-32 screw instead of a 10-24 screw. (Because the torque wrench was powerful enough, this was not inspected during the assembly process.)

Our customer says that this unit would face some amount of vibration during itz application in the field.

Questions:
(1) what is the worst case scenario that we are looking at becos of the faulty screw.
(2) What will be the retention properties of this screw? will this give way?

Feed me with your comments also.

Regards,
bernie

 

[EnglishMuffin]

You could helicoil it, or use some other type of thread insert. But if I were the customer I would ask for a new motor.

 

[Mendit]

The effective holding power of a 10-32 in a 10-24 hole is less than 20%. There is not much torque required to install this screw in the hole as the depth of a 10-32 is only 0.027 whereas the 10-24 is 0.041 deep. This fit up is poor and you should recall all product with this known defect
If you are working through an ISO program, do this under a positive recall. Make this known to your clients and advise of possible failure. If you fail to tell your customer of a known defec, and there is a failure where there is injury or death you are liable.