MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, offering robust environmental sealing and operating temperatures ranging from -65 °C to 200 °C. These harsh environment connectors, in various configurations like front and rear wall mount, jam nut, and box mount receptacles, ensure reliable performance in demanding applications. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and offering multiple plating options, including cadmium-free finishes, these connectors meet stringent military specifications for durability and performance. With EMI/RFI shielding and a bayonet coupling design, they provide excellent signal integrity and ease of installation in aerospace, defense, and industrial settings.