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I'm thinking about using the Bopla UM 32009 housing for my product. It has little standoffs for attaching PCBs. These standoffs are made of plastic, and seem to be drilled (or molded?) to a diameter of 2.0 mm.

My questions: What type of screw would be appropriate for this hole diameter? A regular M2 machine screw won't work well. An M2.5 might work, but would probably deform the standoff.

An M2.2 self tapping screw might work I suppose, but I think the hole is a bit large for this (recommended is something like 1.8 mm).

Is there some kind of imperial screw that fits well into a 2.0 mm plastic hole?

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  • $\begingroup$ If the hole is exactly 2mm diameter, M2.5 self-taping screw. $\endgroup$ – Tom Carpenter Oct 8 '15 at 5:33
  • $\begingroup$ Consider e-mailing the manufacturer of you enclosure. They should know what kind of screw the holes are intended for. $\endgroup$ – Nick Alexeev Oct 8 '15 at 6:18
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Typing "screws" in the search field of the Bopla website finds this link.

It looks like the screw you need is has a shank diameter of 1.7–1.8 mm and a thread diameter of 2.2 mm. The head is rounded.

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