Agreed that they should be masked with a wide tolerance on acceptability. IE minor over spray or incursions on an edge should be a process indicator, not a defect. Rich Kraszewski Senior Staff Process Engineer Phone: (920) 969-6075 * * * * * * * * CONFIDENTIALITY NOTICE * * * * * * * * This e-mail and any attachments are confidential from Plexus Corp. and may contain information which is privileged, confidential, and/or protected by non-disclosure agreements. They are intended solely for the use of the named addressee(s). . Any unauthorized use or disclosure may be unlawful. If you are not a named addressee, you must not use, disclose, retain or reproduce all or any part of the information contained in this e-mail or any attachments If you have received this transmission in error, please destroy it and notify us immediately by return e-mail or by calling + 1 888 208 9005. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of lduso - Diamond-MT.com Sent: Thursday, January 10, 2019 4:15 PM To: [log in to unmask] Subject: Re: [TN] Conformal Coating and Unplated Mounting Holes [EXTERNAL] This email was sent from outside of Plexus. Use caution when opening attachments or links from unknown senders. . 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? >