MIL-DTL-38999 Series II - JT Connectors

Amphenol MIL-DTL-38999 Series II JT circular connectors are industry-standard lightweight, low-profile connectors for harsh-environment applications where space and weight come at a premium. These MIL-SPEC connectors feature up to 128 contacts in high-density insert arrangements with a three-point bayonet coupling system for fast and secure mating. Series II connectors are available in aluminum or stainless steel with multiple finish options.

D38999 Series II connectors were developed in accordance with the MIL-C-38999 specification, which was later superseded by MIL-DTL-38999. These connectors were born out of a desire in the 1960s to develop a ruggedized, high-density interconnect solution for military applications, particularly for the harsh environments of military aerospace. Optional backshells are available to provide strain relief in high-vibration environments.

FAQs: MIL-DTL-38999 Series II JT Connectors

What is the MIL-DTL-38999 Series II JT connector?

The MIL-DTL-38999 Series II JT connector is a high-reliability, circular, bayonet-style connector designed for demanding environments. Series II JT Connectors feature a low-profile design and a three-point bayonet coupling system for quick mating. This series is widely used in aerospace and defense applications.

What applications are D38999 Series II JT connectors suitable for?

Series II JT connectors are widely used in:

• Aerospace and avionics systems
• Defense and weapons platforms 
• Naval and shipboard electronics 
• Communications equipment 
• Ground support and test equipment

Can D38999 Series II JT connectors be used in high-vibration environments?

Yes, Series II JT connectors are designed to meet MIL-DTL-38999 shock and vibration requirements, and the three-point bayonet coupling ensures secure retention in high-vibration environments.

What are the most common shell sizes for MIL-DTL-38999 Series II JT connectors?

Common shell sizes include: 9, 11, 13, 15, 17, 19, 21, 23, and 25.

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• Lightweight, Space Saving Design
• Quick Positive Coupling - 3 point bayonet lock system
• Mismating Eliminated - with 5 key/keyway design
• Error Proof Alternate Positioning - insured by different key/ keyway locations
• EMI Shielding - grounding fingers optional
• Nine Shell Sizes and a Variety of Shell Styles
• Contact Options - size 8, 10, 12, 16, 20, 22M and 22D Crimp, Solder, PCB, Wire wrap, Coax, Twinax, Triax, Thermocouple, Fiber Optic and Filter
• Fixed Solder Contacts - available in solder versions as both Commercial and Military qualified to MIL-DTL-27599
• Inventory Support Commonality - uses standard MIL-DTL-38999 contacts, insert arrangements and application tools.
• RoHS Compliant Product Available - Consult Amphenol Aerospace Operations. 
• Supports up to 128 contacts per connector in high-density configurations.
• Operating temperature range rated from −65 °C (-85 °F) to +175 °C (347 °F).
• Environmental sealing for protection against sand, dust, moisture, and fluids in harsh-environment applications.
• Finish-dependent salt spray resistance up to 500 hours.
• Scoop-proof shell design with recessed contacts to prevent damage during mating.