D38999 Connectors Overview

D38999 Connectors Overview

MIL-DTL-38999 Series I, II, & III connectors have been military-approved and designed for cable-to-panel applications in virtually any aerospace system. They come in a broad range of shells, materials, and polarized contact layouts to meet the ever-changing demands of the industry. MIL-DTL-38999 connectors offer high resistance to large amounts of shock, vibration, and EMI.  When additional resistance to air and gas is needed, hermetic style connectors fulfill those requirements with a molded polymer or glass-sealed shell. Their versatile design is currently being used in the comfort of commercial flight and even in the harshest environments of military operations and space.


MIL-DTL-38999 connectors come in cylindrical form with polarized contacts arranged in various layouts. Shells are available in several materials including composite, aluminum, and stainless steel. The contacts are held in a dielectric insulator, sometimes called an insert, and are housed in a shell that is used for security and protection. The contacts may be installed or removed using the appropriate tools. The electrical connection established between the connector the system terminal is either soldered or crimped. Mated connectors will typically incorporate some type of locking mechanism with a definitive ‘click’ to prevent disengagement and inform its user of proper installation. MIL-DTL-38999 Series I, II, & III connectors are extremely dynamic and are currently being used in the following industries:

  • Civil and Military Aerospace
  • Industrial Application
  • Marine Equipment
  • Communication Equipment
  • Medical Instrumentation
  • Ballistic Missiles and Weapon Systems
  • Armored Carriers and Tanks
  • Test Equipment
  • And more…


Air Electro is an authorized distributor of MIL-DTL-38999 connectors. We have been serving the connector market since 1952. Air Electro stocks components to assemble over 20,000 variations of MIL-DTL-38999 connectors. As an authorized value-added stocking distributor, we offer: Corsair Souriau-Sunbank by Eaton and RMS. MIL-DTL-38999 connectors have a 48h assembly process on our value-added lines. We also offer Glenair and TE Connectivity D38999 hermetic versions. Our custom designed connectors are offered and manufactured through AEI Manufacturing, an Air Electro subsidiary.