, Would anyone be able to comment on relevance to Immersion White Tin as a surface finish on Class 3 hardware? Further, how about when not soldered (as in pressfit)? Lately I've had vendors reach for this finish in pressfit applications due to easier control of difficult finished hole size tolerances. The NASA site seems to indicate *any* Sn is mil-prohibited as a final finish (still surfing). Thanks in advance, and thanks for a good technical thread! -- Jeff Seeger Applied CAD Knowledge Inc Chief Technical Officer Tyngsboro, MA 01879 jseeger "at" appliedcad "dot" com 978 649 9800 --------------------------------------------------------------------------------- Technet Mail List provided as a free service by IPC using LISTSERV 1.8d 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 delivery of Technet send the following message: SET Technet NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail Archives Please visit IPC web site (http://www.ipc.org/html/forum.htm) for additional information, or contact Keach Sasamori at [log in to unmask] or 847-509-9700 ext.5315 ---------------------------------------------------------------------------------