... Copper Thickness: 140micron(4oz)5.Min Board Thickness: 0.4mm6.Max Board Thickness: 5.0mm7.Min finished Hole ... to diameter ratio: 0.8:117.Maximum working board size: 520*622mm18.Drilling Tolerance (PTH): ±0 ... Gold, Immersion Gold, Immersion Tin, Immersion Silver, OSP, Gold Finger Plating, Carbon Ink Printing, Peelable Blue Mask PCB production capacity Double sided PCB :200000 ft2 /MonthMultilayer PCB ...