Circular connectors are used in a wide range of applications such as industrial, medical, and machine construction. These connectors are found in all types of machines from air conditioning units to industrial control panels and pumps. Circular connectors have become the standard for connecting cables to circuit boards. The main categories include MIL Spec, MIL Spec Styled for a cost-effective alternative, Boeing-spec BACC for primary use in the air and military industry, hermetic sealing, micro-miniature, push-pull, and quadrax connectors.