MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert. With front wall mount, rear wall mount, and jam nut receptacles, they offer versatility in installation. These connectors are environmentally sealed and can withstand temperatures ranging from -65 °C to 200 °C. Made of high-strength aluminum, they come in various shell sizes and insert arrangements, accommodating M39029 rear release crimp contacts. Plating options include cadmium-free finishes, ensuring compliance with RoHS standards. The connectors, with gold-plated removable crimp contacts, provide reliable connectivity, with a mating style of bayonet coupling. Suitable for military and industrial applications, they offer durability and conductivity, with a service rating of I for stringent environments.