連接器的基本結構件有①接觸件；②絕緣體；③外殼（視品種而定）；④附件。接觸件（contacts） 是連接器完成電連接功能的核心零件。一般由陽性接觸件和陰性接觸件組成接觸對，通過陰、陽接觸件的插合完成電連接。陽性接觸件為剛性零件，其形狀為圓柱形（圓插針）、方柱形（方插針）或扁平形（插片）。陽性接觸件一般由黃銅、磷青銅制成。

A brief introduction to the structure principle of the connector

Connectors are made up by contacts, insulator, housing and other accessories. Contacts are the core part of completing electric connection, which consist of yin and yang contacts. Yang contacts were inflexible parts including round pin, square pin or plug. And  yang contacts were almost made up of brass or phosphor bronze.