The MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they offer versatility in front wall mount, rear wall mount, and jam nut receptacles, as well as RFI grounding plugs. Utilizing M39029 rear release crimp contacts, these connectors come in high strength aluminum shells with options for plating, including cadmium-free finishes. Meeting military specifications, they provide reliable connectivity with gold-plated removable crimp contacts, suitable for demanding applications.