The most common method is to call them out to be masked but with no
dimensions so we go with 1/4" or 5/16". Often, when I ask if a dimension is
needed, they say to just ensure the bore is free. Next most common would be
specific dimensional masking. I often get this from aerospace customers.
The "newbies" to coating will often call out an exotic dimension that
cannot be masked with a common sized, easily available tape-dot. Which
substantially adds cost to have them custom cut. Functionally, if nothing
metallic will be exposed, it doesn't matter how big it is.

Lloyd Duso
Diamond-MT
(814) 535-3505
www.Diamond-mt.com


On Thu, Jan 10, 2019 at 4:36 PM Jack Olson <[log in to unmask]> wrote:

> Is it more common to conformal coat unplated mounting holes?
> or designate a clearance diameter on the assembly drawing?
>