Isolating a screw which fails under ESD test

[Mechanic77]

Hello all,

We are having problems with a carbon-steel M3x16 self-tapping screw, which fails under voltage pulse test (25 kilo-Volts).

It is a self tapping screw for plastics, and when under test, voltage passes through it into the system.

I'm looking for a solution, in the form of an isolated type of self-tapping screw (maybe other material), if exists,

or

ways to isolate this screw.

Any other suggestion(s) on how to avoid this problem will be appreciated.

recommendations?

Thanks in advance,
Eran.

 

[EdStainless]

What is it arcing to?
Shorter screw and thicker boss are the first steps.
But if it is shorting to a particular internal item them perhaps a shield between them would help.

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P.E. Metallurgy, Plymouth Tube

 

[Mechanic77]

Shorter screw and thicker boss are the first steps.
But if it is shorting to a particular internal item then perhaps a shield between them would help.

Thanks!
I'll try that.

Best regards.