What is Counterbored Hole

In engineering, there are three types of holes: blind holes (on the left), through holes (in the middle), and interrupted holes (on the right).

PCB를 드릴링하는 과정에서 부품 구멍, 기계식 구멍, 비아 구멍(블라인드 구멍, 매립 구멍, 마이크로 구멍 및 스루 구멍 포함) 등 다양한 유형의 구멍이 생성됩니다. 필요한 정확도를 달성하기 위해 일반적으로 수동 또는 레이저 PCB 드릴을 사용하여 구멍을 뚫습니다.

A clearance hole refers to a hole in an object that is large enough to allow the threads of a bolt or screw to pass through, but not the head of the bolt or screw. This type of hole is designed to prevent the threads from biting into the material and allows for easy insertion of the screw or bolt.

Surface Mount Technology (SMT) is often preferred over Through Hole Technology due to its higher reliability and cost-effectiveness. However, it is important to note that Through Hole Technology still offers unique advantages that make it relevant for the foreseeable future.

Some sources may claim that tooling holes and mounting holes are identical, but this is not entirely accurate. The main distinction lies in the plating: PCB tooling holes are non-plated through-holes, whereas mounting holes are usually plated.

Although there is no specific hole size requirement for a PCB, there is a range of standard drill hole sizes that can help you make a selection. Opting for a hole size within the range of 5 mil (0.13 mm) to 20 mil (0.51 mm) should allow your CM to accommodate your design, although smaller sizes may incur additional costs.

PCBs originally had tracks printed on just one side, but as technology advanced, both sides of the board were utilized. In addition, multi-layer boards were introduced. Plated-through holes (PTH) were then implemented to allow the components to establish contact with the necessary conductive layers.