MIL-DTL-38999 series III connectors

MIL-DTL-38999 series III connectors are high performance cable to panel interconnects, suitable for military, aerospace and harsh environmental applications. One of the four variants of the MIL-DTL-38999 is the series III , this has developed in the market to become a de-facto standard.

Up to 128 contacts are available in a number of defined high density insert arrangements,

The MIL-DTL-38999 series III features a number of body styles, contact termination options, body materials and platings to suit a broad range of electronic, mechanical and environmentally demanding applications.

The tables at the bottom of this page not only help you construct a part number but also describe the variants and performance levels available within the range.

These connectors can be ordered with a very broad range of compatible accessories to suit different cable and installation requirements. Some of these can be found on the Accessories Page. Your NYK Component Solutions specialist can advise you further.

Amphenol Conesys CannonITTindustries Deutsch Glenair Sealtron TE

Connector Range Characteristics



  • Description: Scoop-Proof, Triple Start, Self-Locking.
  • Coupling: Triple-start threaded coupling design, rapid advance, self-locking and full-mate indicator, keyed.
  • EMI Shielding: EMI shielding to 65dB minimum at 10 GHz.
  • Mating Speed: 360°, one full turn to full mate.
MIL-DTL-38999 hermetic connectors

MIL-DTL-38999 series III connectors

  • Products Options see table ‘SHELL STYLE’
  • Contacts see table ‘CONTACT RATINGS’
  • Contact Arrangements see table ‘INSERT CONFIGURATIONS BY SHELL SIZE’
  • Body Platings see table ‘SERVICE CLASS’
  • Variantssee table ‘POLARIZATION’

How to Order a MIL-DTL-38999 series III connector

1. How and where will this connector be used? Select your Shell Style 

2. What environment will this connector be used in ? Select your Service Class.

3. What is your electrical requirement? Define your Shell Size, this will be dictated by your circuit demands so therefore your Contact Arrangement

4. Which half of your circuit is active? This will define your Contact Style, i.e. whether your connector should have Pins or Sockets.

5. Do you need to prevent mis-mating with similar neighbour connectors? Define if your connector needs a Polarising Position or insert N for none.

The tables below will assist you to construct an official MIL spec part number for a MIL-DTL-38999 series III connector. Many of the connector OEM’s have their own proprietary part numbers which we can cross reference to from the Mil part numbers. NYK Component Solutions are distributors for the industry leading connector OEM’s and we can provide unbiased advice for you to meet your technical and logistical requirements.

25848 (1)

Polarization Notes:Numbers in table are angle of rotation in degrees.

• from main key looking clockwise onto front face of plug

• from main keyway looking anticlockwise onto front face of receptacle.

Keyway identification ‘N’ is normal. 

Insert arrangements do not rotate with the main keyway.