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 from -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, along with RFI grounding plugs. Constructed with high strength aluminum shells, these connectors come with a range of plating options including cadmium-free finishes. Utilizing M39029 rear release crimp contacts, they ensure reliable connections with gold plating for optimal conductivity. Meeting MIL-DTL-38999 I military specifications, these circular receptacles are ideal for back panel wall mounting applications, offering durability and performance in demanding environments.