MIL-DTL-38999 Series I connectors offer rugged performance with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, these connectors feature front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. With 9 shell sizes and 52 insert arrangements, they accommodate M39029 rear release crimp contacts for reliable connectivity. The high strength aluminum shells come in various plating options, including cadmium-free finishes, meeting RoHS certification. Operating within a wide temperature range from -65°C to 200°C, these connectors are ideal for demanding applications that require durability and performance in extreme conditions.