MIL-DTL-38999 circular connectors with size #22 crimp removable contacts have been a standard in both military and commercial aviation since the 1970’s. MIL-C-38999 connectors were first developed for the interconnection of communications and avionics equipment in harsh Navy and Air Force airframe applications, particularly those subject to high-vibration, wind, and moisture. Today, a broad range of D38999 type cylindrical connector types — many specialized for land, sea, air and space applications — are used for the interconnection of electronic systems, sensors, power supplies and other equipment that depend on reliable performance and standards-body guarantees for performance and quality.

MIL-DTL-38999 connectors are some of the most popular and widely used subminiature circular connectors. With three coupling methods, nine shell sizes, and a wide variety of contact arrangements, the connectors help give you the range of choices you need.

So for what are mil spec circular connectors used for?

Originally designed to meet military specifications, mil spec circular connectors are used in rugged environments in automotive contexts, mobile equipment, and oil and gas applications. They are specially designed for durability and resistance to vibration, corrosion and so on depending on the application.

mil spec circular connectors types

Some of the most co mmon specifications and standards include:

·        Series I and Series IV

connectors have a fast disconnect system. They offer high resistance to vibration and are also ideal for environments that experience strong winds and high humidity.

·        Series II

connectors are have a low profile, so are used when weight or space is limited, or in low-vibration situations.

·        Series III

connectors can be used in high-temperature situations where good resistance to vibration is also required, as well as in environments with high winds and humidity.