MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, offering environmental sealing and a wide operating temperature range of -65 °C to 200 °C. This harsh environment connector family includes front wall mount, rear wall mount, and jam nut receptacles with RFI grounding plugs. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, these connectors come with plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum, including RoHS certified finishes. Suitable for military applications, they are designed for reliability with gold-plated contacts, bayonet mating, and a service rating of M. Their compact shell size 15 and 37 removable crimp contact configuration make them ideal for demanding environments, ensuring conductivity and durability with a mating life of 500 cycles. Additionally, they offer ingress protection for potting applications.