Tom, You need the standards IEEE std 1301 -1991 & IEEE std 1301.1 -1991 covering Metric equipment practice (Futurebus) and IEEE std 896.2 -1991 on Futurebus+. I have checked these standards and you dimensions appear correct according to the standard. Ron Wedemeyer Senior Engineer - Product Engineering QPSX Communications Pty Ltd [log in to unmask] *************** ORIGINAL MESSAGE FOLLOWS ***************** Does anyone have the overall brd dims of a 12SU X 18SU pwb basic brd? The documentation I have is unclear, at best. The dims I have now are 10.433 X 17.244. Thanks! Tom Kavendek Lucent Technologies Murray Hill, NJ