What is Castellated holes / half-holes?


Castellated holes is PTH holes or via that are cut through to create a partial or half holes to form an opening into the side of the hole barrel.

Generally, it is used for mounting a PCB to another one.



How to make castellated holes in your design?


Please make sure a via or plated hole is added directly on the outline of the boards where the plated half hole is required.

Ensure that half of the via is on the board and half is on the outside of the outline. 


BTW the following rules should be followed:

- Copper layers (GTL and GBL): Copper pads on both top and bottom copper layers for each castellated hole.

- Solder mask layers (GTS and GBS): Solder mask openings on both sides.

- Drill layer (TXT/DRL): A drill hole for each castellated hole.

- Mechanical/Outline layer (GML/GKO): The outline should cross the drill hole.



1, When "Yes" option is checked on the order form, we will make the half holes found in your design to be plated with copper, it will cost you extra fee for half holes.

2, If "No" is checked, the half holes will not be plated with copper.

3, To make Castellated holes, the hole size and space need to be 0.6 mm at least.


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