Active Electronics

LJT/HE308 - JD38999 Series I

MIL-DTL-38999 Series I & HE308 qualified

Thanks to its high level of expertise on MIL-DTL-38999 SERIES I, II & III & EN3645 connectors, Amphenol Socapex is the industry leader in D38999 circular connectors.  Offering QPL MIL-DTL-38999 and EN3645 qualified connectors with a large range of features including 38999 Rack & Panel, 38999 Miniature, 38999 Reduced Flange, 38999 Stand-off, 38999 Integrated Backshell & 38999 Power, Amphenol Socapex can answer all your needs through its line of reliable & qualitative products. Our 38999 connectors are available in Aluminum, Stainless Steel, Marine Bronze or Composite material with ROHS-compliant plating available in Black-Zinc Nickel and more. While the qualified Mil-Spec versions offer you a number of features, our customizable options are endless. We provide also free D38999 Series III CAD files.


Call our UK Sales team on 01494 441414

or please email us


Key features

  • MIL-DTL-38999 series I and HE308 qualified

  • Large variety of contact arrangements and shell types, with maximum weight / space savings

  • 100% contact protection

  • Metallic and composite version


  • Battlefield Communication

  • Grounded vehicles

  • Military avionics

Technical information

Shell material:

  • Aluminium alloy

  • Marine bronze available (please consult us)

  • Carbon steel (for hermetic receptacles)


  • Olive drab cadmium plating

  • Electroless nickel plating

  • Black Zinc Nickel plating

  • Tin plating (for hermetic receptacles)

  • Other plating: zinc cobalt Shell sizes: 9 sizes from 09 to 25


  • More than 60 arrangements of contacts including high density and power versions

  • Size 00, 4, 8 dedicated power contacts and sizes 8, 12, 16, 20, 22D contacts for power or data transmission

  • Signal: crimp, PCB, wire-wrap, cable soldering (hermetic only)

  • Power: crimp, PCB – Coax: crimp, cable soldering, PCB

  • Twinax: crimp, PCB

  • Optical termini

Contact protection:

  • 100 % scoop-proof shell

  • Improved interfacial seal ensures sealing around each contact and prevents electrolytic erosion

EMI / RFI protection:

  • shielding ring on the plug shell

Download the Product Brochure – LJT 25P1 1x500A

Download the Product Brochure – LJT 25-1A 4x100A

Download the Product Brochure – LJT23P1 1x250A

Download the Product Brochure – MIL-DTL-38999 series I / LJT / HE308

Download the Product Brochure – LJT 21-48


Since 1947, Amphenol Socapex has prescribed, designed and manufactured reliable and innovative interconnection solutions for harsh environments, specializing in standard and customized electrical and fiber optic connectors, contacts, accessories and cabling solutions.

Located in the Mont Blanc region of France and Pune in India, Amphenol Socapex has a presence in over 100 countries around the world.

Amphenol Socapex is part of Amphenol Corporation.