4.4mm PCB with blind vias and countersink holes

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This is a VERY special 4 Layer PCB with thickness 4.4mm, and blind vias from L1-L2,L3-L4.

Countersink holes :top hole size 1.0mm, bottom hole size 1.6mm  min hole is only 0.3mm

Matt Black solder mask. via in pad.


We can make nearly all types of special PCBs,top thermal conductivity PCBs,HDI ,RF,Rigid-flex PCBs. We do what others are unable to do .

Here is the stackup:


Core 0.365mm


PP FR4 bare core 3.065mm


Core 0.365mm



Here is the countersink holes.


2022-08-17 15:36

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Storm Circuit Technology Ltd. is a professionl PCB manufacturer focos on HDI,RF and Rigid-flex PCBs.