The metal parts of the terminals above, in a nutshell is to tighten the terminal screw. Screw terminal, also known as the screw connection of the printed circuit board terminals.
The screw connection the way PCB terminal block has been in the electronics industry occupies an important, has now become an important component parts of the printed circuit board. Structured design but also take into account the characteristics of the wiring convenient and reliable screw connection.
Used in a wide range of terminals in the world of electrical and electronic engineering industries. At present, the most widely used in addition to the PCB terminal hardware terminal nut terminals, spring terminals.