Hermetic Receptacles


QPL - Made in America

Eaton's MIL-DTL-38999 Series III hermetic connectors are designed for harsh environment, military and aerospace connectivity applications.

American-made QPL hermetic connectors include:

  • MIL-DTL-38999/21
  • MIL-DTL-38999/23
  • MIL-DTL-38999/25
  • MIL-DTL-38999/27

Please visit the MIL-DTL-38999 Series III lanyard and general purpose connectors web pages for additional QPL solutions.

For more information, call 805-484-0543 or select one of the following links:

Shell Sizes 9 to 25 - Over 40 Standard Insert Arrangements


MIL-DTL-38999 Series III hermetic Connectors Finish Classes


Please download the brochure linked at the bottom of this page fpr specific finish-class availability on MIL-DTL-38999/25, MIL-DTL-38999/21, MIL-DTL-38999/27, and MIL-DTL-38999/23 connectors.

Custom Hermetic Solutions


Eaton's MIL-DTL-38999 Series III hermetic receptacles can be quickly customized to meet a broad array of military and aerospace connector requirements. Quick-turn modifications include:

  • Special insert/shell arrangements and materials.
  • Custom connector/cable assemblies and wiring harnesses.
  • Space-rated solutions including NASA Threaded Coupling (NATC).
  • Filters optimized for application-specific frequency, voltage, and impedance requirements.
  • Operation in extreme environments including extended temperature ranges, shock and vibration, radiation, EMI/RFI, corrosive contaminants, vacuum, and pressures to 20,000 PSI.

Additional Hernetic Connector Information - Series III Design Guide


Get your copy of the MIL-DTL-38999 Series III Design Guide. This 60-page brochure contains detailed connector selection and design-in information including:

  • Insert service ratings and arrangement drawings.
  • D38999 QPL part number to factory part-number conversions.
  • Comprehensive product specifications and mechanical drawings.
  • Assembly instructions and installation tool descriptions.

Use the links below to download a PDF or send an e-mail to request printed copies.