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Spacing of Adjacent Holes Printed From: PCB Libraries Forum Category: General Forum Name: General Discussion Forum Description: general topics not related to other forums URL: https://www.PCBLibraries.com/forum/forum_posts.asp?TID=2044 Printed Date: 03 Nov 2025 at 8:20pm Topic: Spacing of Adjacent Holes Posted By: Gary K Subject: Spacing of Adjacent Holes Date Posted: 21 Dec 2016 at 12:08pm IPC-2221A 9.2.7 states that the "residual laminate material" be no less than 0.50 mm (20mil). This translates into hole to hole clearance, or hole to hole spacing. I don't have access to IPC-2221B which is the current rev as of November 2012. Can someone post whether the value has changed in IPC-2221B? Replies: Posted By: Matthew Lamkin Date Posted: 06 Jan 2017 at 4:52am The values are the same in the rev B standard.

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