MIL-DTL-38999 Series I connectors offer high-performance connectivity with up to 128 contacts in environmentally sealed inserts. Designed for harsh environments, these connectors can withstand temperatures ranging from -65 °C to 200 °C. Featuring various mounting options like front wall mount, rear wall mount, and jam nut receptacles, they ensure versatile installation. The connector family includes 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts in multiple sizes. Constructed with durable high-strength aluminum shells, they come with a range of plating options, including cadmium-free finishes for RoHS compliance. With a service rating of M and E, these connectors are ideal for demanding applications, offering reliable performance with 500 mating cycles.