MIL-DTL-38999 Series I 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 shell sizes and insert arrangements, they offer versatility for different applications. These connectors come in high-strength aluminum shells with options for plating such as cadmium or nickel. The receptacles, including front and rear wall mounts, as well as jam nut options, ensure secure connections. Utilizing M39029 rear release crimp contacts, they provide reliable performance, with gold plating for enhanced conductivity. Meeting military specifications, these connectors guarantee durability and resistance to environmental factors, making them suitable for demanding industrial and defense applications.