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 in different sizes, they ensure reliable performance. Perfect for military and aerospace applications, these circular connectors are ideal for back panel wall mounting with bayonet coupling, offering durability with a mating life of 500 cycles.