What are MIL-DTL-28840 Connectors?

By Amy Goetzman | September 27, 2022

Meet the Connector: MIL-DTL-28840 Connectors

MIL-DTL-28840 connectors are high-density circular connectors used for harsh environment military applications. Originally developed for the Navy, they are used in shipboard applications for surface craft of all sizes as well as submarines and unmanned underwater vehicles. They are water-resistant, corrosion-resistant, and can endure water pressure while maintaining a secure connection.

The 28840 connector series features a high shock-resistant coupling system with front release crimped contacts and a splined backshell interface. It is scoop-proof, keyed, and features threaded coupling. A contact retention clip secures the connection. An integrated wire sealing grommet adds environmental ruggedization and enhances the mechanical performance of this standard shipboard electrical signal connector.


Design Notes 

Standardization: MIL-DTL-28840 or M28840 connectors feature a standardized interface that is compatible with any qualified 28840 connector. Per the standard, 28840 connectors must undergo conformance testing that includes visual and mechanical examination; insulation resistance testing at ambient temperatures, and dialectric withstanding voltage.

Mounting options:

  • M28840/10 (wall mount receptacle)
  • M28840/11 (cable connecting receptacle)
  • M28840/12 (box mount receptacle)
  • M28840/14 (jam nut receptacle)
  • M28840/16 (straight plug)

Cable considerations: Intended for use with a jacketed cable in shipboard applications; MIL-C-915 shipboard cable and MIL-W-16978

  • Shielding: Shielded from RF, EMI
  • Sealing: Grommet and seal; IP67 unmated
  • Shell sizes: 11, 13, 15, 17, 19, 23, 25, 29 & 33
  • Pin count: 7, 12, 21, 31, 42, 64, 92, 121 and 155
  • Plating options: Cadmium, zinc nickel & tin zinc
  • Keying options: 1, 2, 3, 4, 5, and 6 for both plugs and receptacles.
  • Contact size: AWG 20 with wire accommodation options from AWG 20 to AWG 28
  • Termination: Crimp termination, rear insert, and front release contacts
  • Backshells: Straight, 90°, and 45°
  • Inserts: RJ45 and USB inserts available
  • Operating temperature: -55 °C  to +200 °C
  • Current rating:

Markets, Sectors, and Applications

  • Transportation, Military and Aerospace, Telecom/Datacom
  • Shipboard applications for surface craft and submarines; mobile and combat communications networks; emergency telecommunications (METS) stations; other harsh environment electronics


Ametek, Amphenol Pcd, Glenair, Interstate Connecting Components (ICC), Powell Electronics, Amphenol, Aptiv (assembled by TTI, Inc.), Cambridge Technologies, Souriau (supplied by Mouser Electronics), Milnec

Related products:

  • MIL-C-55181
  • MIL-DTL-38999

Like this article? Check out our other Meet the Connector, Harsh Environment, and our Military/Aerospace Industry Page, and our 2022 Article Archive

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Amy Goetzman
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