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, these connectors offer front and rear wall mount options, as well as jam nut receptacles with RFI grounding plugs. Constructed with high strength aluminum shells, they come in a range of plating options including cadmium-free finishes. Utilizing M39029 rear release crimp contacts in various sizes, these connectors ensure reliable performance with a mating type of bayonet coupling. Meeting military specification MIL-DTL-38999 I, they are suitable for demanding applications requiring durability and environmental resistance.