D38999 series connectors

Engineers and procurement professionals in the military and aerospace industry work with MIL-DTL-38999 connectors on a daily basis. However, with constant exposure and ingrained routines, it can be easy to forget some of the basic concepts surrounding this group of QPL-approved (Qualified Parts List) circular connectors. This is particularly true when it comes to the differences between the MIL-DTL-38999 Series I, II and III connectors.

MIL-DTL-38999 is a circular, high-density bayonet style with shell sizes ranging from #9 to 25 and over 50 QPL approved insert arrangements. Originally designed for cable-to-panel applications in the military and aerospace markets, these high-reliability connectors are now used throughout a variety of industries that require EMI shielding and excellent resistance to shock and vibration as well as fluid ingress. This includes marine electronics, communications equipment, weapons systems, armored carriers and tanks as well as test equipment.

The D38999 series connectors is the most common type of military circular connector on the market and meets Airbus specification EN3645. It features a quick 1/3 turn bayonet coupling with a scoop proof design to protect the contacts and a glass to metal seal that achieves hermetic sealing requirements.

What Is the D38999 Series and What Makes It So Unique?

This is a key feature that makes the D38999 an ideal choice for harsh environments where the threat of debris or moisture is a concern. It also means that these connectors can withstand a significant number of mating and unmating cycles.

In addition to the hermetic sealing, this series also boasts a number of other performance attributes that set it apart from other military connectors. It offers a push-pull mating system that ensures proper engagement of the two halves of the connector and a full-mating indicator that allows the user to easily determine when they are connecting the correct way. It also features a polarized shell that helps the user identify the proper orientation of the mated halves prior to contact engagement.

These features make the D38999 a highly durable and reliable connector that can withstand repeated contact cycles as well as extreme temperatures. It is also highly resistant to corrosion and can withstand high levels of shock and vibration.

The Souriau 8D series, compliant to the main MIL-DTL-38999 standards (Series III, EN3645, BACC63), offers an extensive selection of insert arrangements as well as a full range of high end shell materials and platings (aluminum, composite, titanium, stainless steel and bronze). This is a perfect fit for any environment that requires high levels of shock, endurance or firewall capabilities. This allows the user to customize their solution based on the specific requirements of their application.

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