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. These connectors, available in 9 shell sizes and 52 insert arrangements, offer front and rear wall mount options, as well as jam nut receptacles and RFI grounding plugs. Constructed with high-strength aluminum shells, they come with various plating options, including cadmium-free finishes. Utilizing M39029 rear release crimp contacts, they ensure reliable connectivity with gold-plated sockets. Meeting military specification MIL-DTL-38999 I, these circular receptacles are ideal for demanding applications that require durability and performance in challenging conditions.