MIL-DTL-38999 Series II

Part Number Information
Part #: Price/Availability:
MS274 Aero-Electric Buy Now
MS275 Aero-Electric Buy Now

MIL-DTL-38999 Series II connectors feature a bayonet coupling mechanism with lower profile design and rear-removable crimp contact retention system.

These connectors were designed for military and commercial applications where the prime requirements are lower profile and lighter weight.

Reduction of both size and weight were achieved through the use of thinner shell walls and length restrictions. These design restrictions reduced the RFI attenuation characteristicsand the “scoop” protection, while yielding an excellent general purpose, lightweight connector. Compared to Series I, Series II connectors achieve up to 20% reduction in mated pair length, up to 39% reduction in outside diameter andup to 40% reduction in weight (128 pin mated pair).

This family of connectors is offered in six receptacle-mounting styles. They include square flange receptacles, for both front and rear panel (wall) mounting; square flange receptacles, for both front and rear panel (box) mounting; square flangereceptacle with extended grommet, for front of panel (box) mounting; and jam nut receptacles which incorporate “ O” ring seals, designed for rear panel “D” hole mounting.


  • Universal I/R Tool
  • Closed-Entry Socket Insert
  • Interfacial Pin Insert Seal
  • Elastomer Wire Sealing Grommet
  • Superior Contact Stability
  • Shell Polarization