MIL-DTL-38999 with Coaxial, Concentric Twinax, and Triax Connectors

Amphenol Aerospace
Part Number Information
Part #: Price/Availability:
JT-R D38999 II Buy Now
LJT-R D38999 I Buy Now

Amphenol offers a very wide range of contacts that provide high speed transmission and operate in high frequency conditions. You can be assured of interconnection compatibility when you come to Amphenol for your contact needs as well as your connector needs.

Amphenol’s expertise in interconnection solutions assures that your contacts will mate properly and will perform to the application specifications of your particular requirements. MIL-DTL-38999 CONNECTORS - The high performance series most ideal for integrating high speed and high frequency contacts. MIL-DTL-38999, Series I, II and III are by far the choice of connector for today’s avionics needs - these subminiature family connectors are ideally suited for the incorporation of shielded contacts.


  • Size 8 high speed Quadrax and Differential Twinax contacts for MIL-DTL-38999 Series III (specially modified to accommodate keyed contacts) 
  • Transition adapters for use in attaching D38999 Series III connectors with high speed quadrax or differential contacts to PCB boards 
  • Size 8, 12 and 16 Coax contacts 
  • Size 8 and 12 Twinax contacts 
  • Size 8, 10 & 12 Triax contacts


  • Military & Commercial Aviation 
  • Military Vehicles 
  • Missiles & Ordnance 
  • C4ISR 
  • Harsh Environments