MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an insert, designed for harsh environments with a wide operating temperature range of -65 °C to 200 °C. Available in front wall mount, rear wall mount, and jam nut receptacles, they ensure RFI grounding. With 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts in various sizes, including coax and twinax. Constructed with high-strength aluminum shells, they offer plating options such as cadmium finishes or RoHS-certified alternatives. Suitable for military and industrial applications, these connectors guarantee durability and reliability in demanding settings.