MIL-DTL-38999 Series II connectors are designed for harsh environments, offering up to 128 contacts in an insert. These connectors are environmentally sealed, with an operating temperature range of -65 °C to 200 °C, ensuring reliable performance in extreme conditions. The thin-walled, restricted length design features various mounting options, including front and rear wall mount, jam nut, and box mount receptacles. 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 a range of plating options, including cadmium-free finishes, these connectors meet stringent military specifications for durability and performance. Suitable for aerospace, defense, and industrial applications, they provide EMI/RFI shielding and are RoHS compliant. With a service rating of I and a mating life of 500 cycles, these connectors are ideal for critical systems requiring reliable electrical connectivity.