The MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various mounting options, including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility for different applications. These connectors, compliant with military specification MIL-DTL-38999 II, are constructed with aluminum shells and offer a range of plating options, including cadmium-free finishes. With 52 insert arrangements and M39029 rear release crimp contacts, they ensure reliable connectivity. Suitable for use in demanding environments, these connectors are rugged and durable, with a service rating of I and a mating life of 500 cycles.