Hi Rich, We routinely use press-in hardware and I'm not aware that we've ever had a PWB cracking problem. Have you double checked your hole size, both specification and actual, to make certain they're correct? Mike Michael E. Boldt Electronic Packaging Engineer Moog Inc., Motion Systems Division -----Original Message----- From: Rich Lasko [SMTP:[log in to unmask]] Sent: Thursday, November 09, 2000 9:40 AM To: [log in to unmask] Subject: [TN] Stress Cracks on PCB Good morning everyone. I need some input from you guys. We have a product (pcb assembly) in which we needed to "press in" a PEM spacer. Unfortunately when we pressed in the spacer, it has caused stress cracks in the pcb. I have looked in the IPC-A-610 to find out acceptable and rejectable criteria for stress cracks, however, I have not been able to find any. The closest I can come is crazing. However, the defect appears to be more of a stress crack then crazing. Need help. Is there any other accept/reject criteria or anyone else experience with stress cracks from pressing in hardware. Please advise. Rich --------------------------------------------------------------------------------- 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 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 ---------------------------------------------------------------------------------