{"id":895,"date":"2021-04-15T10:37:08","date_gmt":"2021-04-15T02:37:08","guid":{"rendered":"http:\/\/www.bestpcbs.com\/blog\/?p=895"},"modified":"2022-08-10T11:49:09","modified_gmt":"2022-08-10T03:49:09","slug":"why-do-mcpcb-board-have-holes-what-is-pth-npth%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.bestpcbs.com\/blog\/2021\/04\/why-do-mcpcb-board-have-holes-what-is-pth-npth%ef%bc%9f\/","title":{"rendered":"Why do MCPCB board have holes? What is PTH\/NPTH"},"content":{"rendered":"
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If you look closely at a MCPCB<\/a> board, you will see holes of different sizes in the board, each hole was designed for a purpose. These holes can be divided into PTH (Plating Through holes) and NPTH (Non-Plating Through holes). EBest Circuit (Best Technology)’s smallest drill tool is 0.5mm, so generally we require customers to design the minimum hole size of 0.5mm or more.<\/p>\n\n\n\n

How to distinguish PTH and NPTH through holes?<\/strong><\/strong><\/p>\n\n\n\n

In fact, it is very simple. Just look at the hole wall to see if there are bright plating traces (Copper). The holes with copper are PTH, and the holes without copper are NPTH.<\/p>\n\n\n

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PTH & NPTH<\/figcaption><\/figure><\/div>\n\n\n

What is the NPTH used for?<\/strong><\/strong><\/p>\n\n\n\n

If you pay a little attention, you will find that the size of NPTH is usually larger than the PTH, because most of NPTH are for positioning purposes, it can be divided into the following four types.<\/p>\n\n\n\n

  1. 1) <\/strong>Countersink<\/strong>:<\/strong> It’s a cone-shaped hole that is cut into the PCB to allow the flat head of a socket cap screw to fit flush with the surface of the board.<\/li>
  2. Counterbore<\/strong>:<\/strong> It’s a cylindrical flat-bottomed hole that is designed to house a hex head or socket head cap screw to be used to secure a PCB board.<\/li><\/ol>\n\n\n
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    Countersink & Counterbore<\/figcaption><\/figure><\/div>\n\n\n