... . 2. Short lead time. 3. OEM pcba,SMT,DIP and final Assembly. High Standard SMT 4 layers PCBA manufacturingDetails for your check ... Thickness/Hole Ratio: 12:1Min. Solder Mask Bridge: 4mil (Min. SMT Pad Space 8mil)Min. Legend (Silk screen) Track Width: 5milMin ... analysis, etc.Wrap and twist: ≤0Flammability: 94V-0 High Standard SMT PCBA manufacturing