The MIL-DTL-38999 Series I connectors feature up to 128 contacts in an 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 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 options for plating, including cadmium-free finishes. Utilizing M39029 rear release crimp contacts, they ensure reliable connectivity with a mating life of 500 cycles. Suitable for military and industrial applications requiring environmental resistance, these circular plugs are RoHS compliant, making them a dependable choice for demanding connectivity needs.