Just out of curiosity, where did you get those numbers from? Don't think I am disagreeing with you (I've been shooting for 11-14 mils), but I don't remember where I got THOSE numbers from! Jack (aka "the new guy") . On Tue, 21 Feb 2012 10:02:36 -0600, Mark Larson <[log in to unmask]> wrote: >first of all, you have to consider the tolerance, >take a look at the maximum and minimum lead diameter for the component: >in the case of minimum lead diameter to maximum hole diameter, the difference should not exceed 28 mils >in the case of minimum hole size to maximum lead size, the difference should not be less than 6 mils >this is for auto insertion and predates no lead >but obviously you want to shoot for the middle rather than toward either extreme >design for auto insertion and manual insertion will be fine