Yes, there are NAS186 stepped spacers, swaged at these holes. -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of Ian Hanna Sent: Tuesday, November 16, 2010 10:12 AM To: [log in to unmask] Subject: Re: [TN] Military PWB drawing note "CRUSH ZN" more likely refers to the condition -after- assembly -- is there a PEM Nut or other type of compressed fitting installed? Steven Creswick <[log in to unmask]> Sent by: TechNet <[log in to unmask]> 11/16/2010 12:00 PM Please respond to TechNet E-Mail Forum <[log in to unmask]>; Please respond to Steven Creswick <[log in to unmask]> To [log in to unmask] cc Subject Re: [TN] Military PWB drawing note "CRUSH ZN" David, My suggestion is that they are allowing for laminate damage [crush zone] within a 0.250" diameter around the hole. As you make a countersink or counterbore a hole you will end up tearing up the laminate. Sharp tools - change often Steve Creswick http://www.linkedin.com/in/stevencreswick -----Original Message----- From: TechNet [mailto:[log in to unmask]] On Behalf Of David Paluck Sent: Tuesday, November 16, 2010 11:34 AM To: [log in to unmask] Subject: [TN] Military PWB drawing note "CRUSH ZN" I'm working with an military PWB fab drawing from 1994. It contains a note saying "CRUSH ZN .250 DIAMETER" with an arrow pointing to a countersunk or counterbored hole. Can anyone tell me exactly what this means? Thanks ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 ----------------------------------------------------- ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ --------------------------------------------------- Technet Mail List provided as a service by IPC using LISTSERV 15.0 To unsubscribe, send a message to [log in to unmask] with following text in the BODY (NOT the subject field): SIGNOFF Technet To temporarily halt or (re-start) delivery of Technet send e-mail to [log in to unmask]: SET Technet NOMAIL or (MAIL) To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest Search the archives of previous posts at: http://listserv.ipc.org/archives Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815 -----------------------------------------------------