Guy , We had the same problem a few years ago. You need to be sure that you specify to your board vendor the tolerances . And the socket vendor can supply you with their specs for the SIMM. This can be a very difficult problem to straighten out. Be sure to emphasize the specs to your pcb vendor. Good Luck. > We are having problems with the interface between SIMM boards and sockets (72 > Pin). The boards are supposed to be .050" +.004" to -.003". I think that is > an industry standard. Where do you measure the thickness from. The board surface > or the conductor surface. We have some that measure .045 at the glass and .047 > on the edge connectors. They don't work very well, intermittent. > > Anyone else have trouble like this? > >