MIL-DTL-38999 Series I, II, III, and IV Connectors, Accessories, and Application-Specific Derivatives
Glenair supplies one of the industry's most complete selections of MIL-DTL-38999 cylindrical interconnect solutions, including Series I, II, III, and IV connectors, backshells, protective covers, contacts, accessories, and application-specific derivatives. Available in QPL-qualified and COTS aerospace configurations, Glenair D38999 connectors support mission-critical power, signal, RF, high-speed data, filtered, fiber optic, PCB, and hermetic interconnect requirements across military, aerospace, space, naval, and industrial systems.
Originally developed for demanding military avionics applications, MIL-DTL-38999 connectors have become the global standard for high-reliability electrical interconnection in harsh environments. Their compact size, high contact density, environmental sealing, EMI shielding performance, and resistance to shock and vibration make them ideal for aircraft, spacecraft, ground vehicles, naval platforms, weapons systems, sensors, communications equipment, and power distribution architectures.
Available in four coupling styles — Series I Bayonet, Series II Low-Profile Bayonet, Series III Triple-Start Thread, and Series IV Breech-Lock — the connector family delivers exceptional environmental protection, vibration resistance, EMI shielding, and high-density packaging. PCB versions are available in every series, and feature Glenair signature sealing as well as innovative board standoff designs.
From standard QPL-qualified MIL-DTL-38999 connectors to advanced application-specific solutions such as Space-Grade, hermetic, high-speed data, power, filtered, and Glenair SuperNine designs, Glenair delivers engineered interconnect solutions for the most demanding operating environments.
Additional Mil-Spec Circular Connector Families
In addition to MIL-DTL-38999, Glenair manufactures and supports a complete range of military-standard cylindrical connector families including M28840, M26482, AS81703, and other qualified and commercial interconnect solutions for aerospace, defense, naval, and industrial applications.
SuperNine Backpotted and Sealed Printed Circuit Board (PCB) Connectors
D38999 Series I, II, III, and IV Receptacle connectors with PCB terminations are supplied in multiple formats including standard environmental, glass-to-metal hermetic, lightweight CODE RED hermetic, high-speed, and filter. Glenair SuperNine PCB connectors feature robust back-end encapsulant sealing in a wide range of flange and standoff designs that facilitate board mounting and solder flow processing.
Connector Reference Guide and D38999 Test Reports
- Mil-Spec Connector Reference Guide
- Series 23 SuperNine® Environmental and Signal Integrity Test Reports
- MIL-DTL-38999 Series I, II, III, and IV Qualified Hermetic Environmental Test Reports
- DLA Quick Search Document Library
- Glenair QwikConnect Spotlight on: SuperNine Customer-Driven Interconnect System Innovation
- PEEK Composite MIL-DTL-38999 Series III DLA-Qualified Class J and M Plug and Receptacles
