MIL-DTL-38999 Series I connectors feature up to 128 contacts within an insert, offering environmental sealing and a wide operating temperature range from -65°C to 200°C. This connector family includes front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs, providing versatility for various applications. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear-release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8 (coax and twinax). Constructed with high-strength aluminum shells, these connectors come with different plating options, such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, catering to specific needs. Their RoHS certified cadmium-free finishes ensure compliance with environmental regulations. Ideal for military and industrial use, these MIL-DTL-38999 I connectors guarantee reliability with features like bayonet coupling, gold contact plating, and a mating life of 500 cycles, while offering enhanced protection with their environment-resistant design, making them suitable for harsh operating conditions.