What I found a few years back when I researched the requirements for ICT was that SMTA was the actual org that established standards for ICT, they have a document TP-101C (testability guidelines) that spells out the requirements for test, you can also get this info from Agilent or Teradyne web sites, since they are the people that had the major hand in developing it You are correct on the tolerance 3 tooling holes are preferred to two and the hole doesn't have to be .125 IPC-782 has probably the most extensive discussion about ICT, no mention of size or tolerance of holes though, you should not follow 782 IMO, the information there is not current -----Original Message----- From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Fred Dark Sent: Wednesday, February 04, 2004 1:21 PM To: [log in to unmask] Subject: [DC] Tolerances Can some one tell me the IPC standard for the tolerance on a .125dia tooling hole used for ATE\ICT testing that is located in a board in diagonal corners dimensioned from the 0,0 datum.... I'm under the impression that it is +.002/-.000... Would I be correct, if so where could I find this in writing... I have IPC-2221, but I can't find it in there no where.... Please help... Regard's, Fred Dark Jr. ------------------------------------------------------------------------ --------- DesignerCouncil 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 DesignerCouncil. To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 847-509-9700 ext.5315 ------------------------------------------------------------------------ --------- --------------------------------------------------------------------------------- DesignerCouncil 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 DesignerCouncil. To set a vacation stop for delivery of DesignerCouncil send: SET DesignerCouncil NOMAIL Search previous postings at: www.ipc.org > On-Line Resources & Databases > E-mail 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 847-509-9700 ext.5315 ---------------------------------------------------------------------------------