Gary, About 2 years ago, I had a product which had greater than 1000 components (0603) on the underside. No issue The underside was printed using a 0.010" stencil and Locitite 3607. The aperture size was an oblong shape , 0.030" long x 0.015" wide. A minimum of 0.010" gap between the aperture and pad, both sides. The 0603 pad was 0.043" x 0.026". Hopes this helps you Felix ################################################################ TechNet E-Mail Forum provided as a free service by IPC using LISTSERV 1.8c ################################################################ To subscribe/unsubscribe, send a message to [log in to unmask] with following text in the body: To subscribe: SUBSCRIBE TechNet <your full name> To unsubscribe: SIGNOFF TechNet ################################################################ Please visit IPC's web site (http://www.ipc.org) "On-Line Services" section for additional information. For technical support contact Hugo Scaramuzza at [log in to unmask] or 847-509-9700 ext.312 ################################################################