Probably depends somewhat on who you go to. But, I presented the same question last week to a major US board manufacturer and was told, minimum, 5 and 5 on the outer layers, and 4 and 4 on the inner layers as standard pricing. Tom Hybiske General Atronics Corporation Wyndmoor, PA >> I was curious if someone knows how narrow of a trace can I > go until it affects board costs? I have been using 8 mil as a rule. > > Thanks > > > Mark Mainland > PCB Designer > Cherry Electrical Products > 11200 - 88th Ave. > PO Box 581913 > Pleasant Prairie, WI 53158 > Ph. 262.942.6659 > Page. 888.819.0198 > Fx. 262-942-6334 >