Hi Victor,

That's a pretty iffy looking mounting hole, and to tell you the truth, that
kind of damage doesn't surprise me. There was a flat washer beneath that
screwhead wasn't there?

http://stevezeva.homestead.com/PTH_Diameter_vx_Screw_Head_Overlap.pptx

Steve

On Fri, Aug 17, 2018 at 8:54 AM, <[log in to unmask]> wrote:

> Fellow TechNetters:
>
>    I am searching for hardware mounting selection guidelines for the
> purpose of avoiding future damage to PWB PTH external copper pad by
> retaining screw head.
>
> Example pics and current dimensions have been sent to Steve Gregory,
> [log in to unmask]<mailto:[log in to unmask]>
>
>
>
> Givens:
>
> -          PWB PTH Slot Diameter, 138.450 mm
>
> -          Screw Head Diameter, 159.640 mm
>
> -          Screw Shank Diameter, 87.740 mm
>
> -          Potential mating overlap, 21.190 mm
>
>
>
> Victor,
>



-- 
Steve Gregory
Kimco Design and Manufacturing
Process Engineer
(208) 322-0500 Ext. -3133

-- 



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