MIL-DTL-38999 Series I

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MIL-DTL-38999 Series I Connectors (MS2746/9 MS275/276)

High-Density, Scoop-Proof Connectors for Rugged Environments

Elimec USA proudly offers MIL-DTL-38999 Series I bayonet coupling connectors—subminiature, high-density solutions built to perform in demanding military and aerospace applications. These environmentally sealed connectors are engineered for durability, precision, and versatility in general-purpose systems requiring smaller wire gauges.

Key Features

• Scoop-Proof Design
  Recessed pins within elongated shells prevent contact damage during blind mating, ensuring reliable operation even in high-vibration environments.
• Versatile Mounting Options
  Choose from five receptacle styles, including square flange and jam nut options, compatible with front/rear panel or box mounting.
• Superior Sealing Technology
  Includes interfacial seals, closed-entry socket inserts, and triple      elastomer wire seals—providing complete protection against moisture, dust, and fluid ingress.
• High Contact Density
  Available with up to 128 contacts, using sizes 22M, 22D, 20, 16, 12, and 8 (including coax and twinax), for wire sizes from 28 to 12 AWG.
• Universal Insertion/Removal Tool
  A single plastic tool simplifies contact maintenance—suitable for both insertion and removal.

Material & Finish Options

• Aluminum Shells
  • Finish B: Olive drab cadmium over nickel (500-hour salt spray)
  • Finish F: Electroless nickel (48-hour salt spray)
  • Finish A: Bright cadmium over electroless nickel

Performance Specifications

• Operating Temperature:
  • Finish B: –65°C to +175°C
  • Finish F: –65°C to +200°C
  • Finish A: –65°C to +150°C

• Durability:
  Withstands a minimum of 500 mating cycles
• Environmental Sealing:
  Mated connectors with proper accessories meet altitude immersion test (MIL-DTL-38999)
• Fluid Resistance:
  Resistant to common aerospace fluids including MIL-PRF-7808, JP-8, JP-4, JP-5, Coolanol 25, and more.
• Electrical Performance:
  • Shell-to-shell conductivity:
    • Finish F: ≤ 1.0 mV
    • Finish A/B: ≤ 2.5 mV
  • RFI shielding up to 1 GHz
  • EMI performance tested per MIL-STD-1344
• Shock & Vibration:
  • Standard and high-impact shock (MIL-STD-1344, MIL-S-901)
  • Vibration tested per MIL-STD-202 and MIL-STD-1344

Need support selecting the right configuration?
Elimec USA’s technical team is here to help you integrate MIL-DTL-38999 Series I connectors into your system.
Contact us for expert assistance or a quote.