MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, offering rugged environmental sealing for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various configurations including front and rear wall mount, jam nut receptacles, and RFI grounding plugs, they ensure versatile connectivity. With 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8, including coax and twinax options. Crafted in high-strength aluminum shells with plating choices like light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, they cater to diverse needs, with RoHS-certified cadmium-free finishes available. Ideal for military and industrial applications, these connectors guarantee reliable performance in demanding settings.