... quality PCB printed circuit board, PCB, Multilayer pcb.Our PCB Technical Specifications:1.Base material: FR4, ... F4BK, F4BT, TP, PF, CEM-1, CEM-3, etc.2. Board thickness: 0.30 to 3.20mm (12 ... NPTH hole diameter tolerance: 0.03mm (1.2mil)10. Maximum board size: 460 x 620mm (18 x ... pad diameter10mil10Max proportion of drilling hole and board thickness1:12.511Minimum linewidth of Idents4mil12Min Height ...