MIL-DTL-38999 Series I connectors, designed for harsh environments, feature up to 128 contacts in an insert with options for front wall mount, rear wall mount, and jam nut receptacles. These connectors, operating between -65 °C and 200 °C, are environmentally sealed and offer RFI grounding plugs. With 9 shell sizes and 52 insert arrangements available, they use M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, they come in plating options such as electroless nickel and cadmium finishes. Meeting RoHS compliance, these connectors are ideal for demanding applications requiring reliability and durability.