MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert. These connectors are environmentally sealed and can withstand temperatures ranging from -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they offer flexibility for different applications. Constructed with high-strength aluminum shells, they come in a choice of plating options, including cadmium-free finishes for RoHS compliance. The connectors, with front wall mount, rear wall mount, and jam nut receptacles, use M39029 rear release crimp contacts for secure connections. With a mating type of bayonet coupling, they ensure reliable performance in demanding settings. Suitable for military and industrial use, these connectors are known for their durability and conductivity, making them ideal for critical electronic systems.