Terminal pins are electrical connection components used in various electronic applications. They are typically used in PCB assembly and wiring to establish a secure and permanent connection between electronic components. In general, terminal pins are characterized by their solderability, size and shape, temperature resistance, corrosion resistance, and material quality. A good combination of these properties ensures a reliable and lasting connection in the electronics industry. The recommendation for the size of PCB drill holes is a guideline that is always considered in conjunction with the nature and structure of the PCB, as well as the processing of the terminal pins. It may be necessary to adjust the recommended size to achieve an optimal and secure connection, taking into account the specific characteristics and assembly process of the terminal pins and the PCB.