MIL-DTL-38999 Series I connectors are designed for harsh environments, offering up to 128 contacts in an insert with front and rear wall mount options, as well as jam nut receptacles. These environmentally sealed connectors have an operating temperature range of -65 °C to 200 °C, making them ideal for a wide range of applications. Featuring M39029 rear release crimp contacts and available in various plating options, including RoHS certified finishes, they provide reliable connectivity in demanding conditions. The high strength aluminum shells ensure durability, while the bayonet coupling mechanism allows for secure mating. With a range of shell sizes and insert arrangements, these connectors cater to diverse needs, making them a versatile choice for military, aerospace, and industrial applications.