MIL-DTL-38999 Series I connectors offer high-performance solutions for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With operating temperatures ranging from -65 °C to 200 °C, these connectors are ideal for a wide range of applications. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for reliable connectivity. The connectors come in durable aluminum shells with various plating options, including cadmium-free finishes for RoHS compliance. Designed for military specifications, they feature bayonet coupling and jam nut mounting for secure installation. With gold-plated contacts and a service rating of I, these connectors ensure high conductivity and longevity, making them suitable for demanding environments.