Phil, I disagree that there is a fair comparison of configurations here. There may be a "coincidental sizing" only by happen chance. I get the feel of the original question being the "age ole" question of what size round hole for a square pin. When the diameter is over sized for the corners it is to big across the flats (especially true for rectangular pins; 55302 connectors for instance). In the preceding case of a 25 diag in a 22 hole the is a problem. The problem becomes large when it is not controlled. Press fit connector technology is very much controlled. The "oops" configuration uses pin and body shape NOT intended to be press fit. The PTH diameter can and will fluctuate relative to tolerance. The installation of connector is anyone's guess. The press fit connector technology have years of heritage in well engineered systems configuration. The PWB thickness, drilled hole, plating and finish are all mandated. The installation of pins and body are to a precise installation requirement. The pin itself has been engineered with material and config to ensure reliability. At the end of the day I would fly on the press fit connector while the other configuration may work, more importantly it may not. Boston Brad 781 858 0783 --------------------------------------------------------------------------------- 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 e-mail to [log in to unmask]: SET Technet NOMAIL To receive ONE mailing per day of all the posts: send e-mail to [log in to unmask]: SET Technet Digest 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 ---------------------------------------------------------------------------------