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 of -65 °C to 200 °C. Available in front wall mount, rear wall mount, and jam nut receptacles, they offer RFI grounding plugs and come in 9 shell sizes and 52 insert arrangements. Utilizing M39029 rear release crimp contacts in various sizes, including coax and twinax, these connectors are housed in high-strength aluminum shells with multiple plating options such as cadmium and nickel. RoHS certified finishes are also available, ensuring compliance with environmental regulations. Perfect for military and industrial applications, these connectors guarantee reliable performance with features like bayonet coupling, gold contact plating, and a service rating of M for environmental resistance.