D38999/20MB4AA

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D38999/20MB4AA is a type of connector first manufactured by ITT Corporation. It is a MIL-DTL-38999 circular bayonet style quick lock connector. It was designed in accordance with MIL-C-38999 Series III. The connector is available in multiple styles, including hermetic, 50 ohm coaxial microwave and standard electrical. It has mostly been used in aerospace, defense and industrial applications.

The Military Aviation D38999 Connectors series has been designed for a variety of military and commercial aircraft use. They are primarily used in avionics systems, including radar systems, communication systems and navigation and instrumentation systems. These include design and development programs, military maintenance and repair programs, commercial aviation programs, military aircraft programs, and in industrial and commercial programs.

D38999/20MB4AA is a 4-pin variant of the D38999 connector with stainless steel contacts. The specialized contact design and robust construction make the connector appropriate for use when a certain level of corrosion protection and electrical stability is required. It is ideal for low- and medium-voltage applications.

The D38999/20MB4AA consists of three important components: the shell, the insert, and the contacts. The shell is made of cadmium alloy with a zinc-chromate finish to provide corrosion protection. The 4-pin insert is shock and vibration resistant and is also made of cadmium alloy. The contacts of the insert are made of stainless steel pins, with gold-plated sockets for high corrosion resistance.

When connecting and disconnecting, the female connector is inserted into the male connector. Then two backshells are attached to the exposed end of the male and female connectors to form a single unified structure. The backshells not only hold the connectors together but provide additional strength and further ensure environmental sealing. The inner surfaces of the shells are plated with zinc for additional protection.

For proper performance, the D38999/20MB4AA connector must be carefully mated during installation. Incorrect assembly may reduce its electrical integrity or corrosion resistance. It should be inserted into mating parts, carefully ensuring deep seating of the contact pins before tightening the shells.

In summary, the D38999/20MB4AA is a MIL-DTL-38999 bayonet style connector designed for low- and medium-voltage applications, such as avionics systems. It consists of a shell, an insert, and stainless steel contacts with gold-plated sockets, providing excellent corrosion protection and electrical stability. It is designed for quick-fit coupling with two backshells connecting the male and female connectors. It is essential to ensure proper connection and deep seating of the contact pins to ensure proper performance.

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