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 various shell sizes and insert arrangements, these connectors come in aluminum shells with options for plating such as cadmium-free finishes. The connector types include front and rear wall mount, jam nut receptacles, and RFI grounding plugs, all utilizing M39029 rear release crimp contacts. With a mating type of bayonet, they offer reliable connectivity with gold-plated contacts. Suitable for military and industrial applications, these connectors are built for durability with a service rating of II and a minimum contact mating life of 500 cycles. RoHS compliant options are also available, making them ideal for diverse electronic systems in demanding environments.