MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert. These environmentally sealed connectors have a wide operating temperature range from -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they offer versatility for different applications. With options for front wall mount, rear wall mount, and jam nut receptacles, as well as RFI grounding plugs, these connectors provide secure and reliable connections. Constructed with high-strength aluminum shells and offering multiple plating options, including cadmium-free finishes, they meet stringent military specifications for durability and performance. Ideal for use in demanding environments, these connectors ensure conductivity and ingress protection, with male contact gender and removable crimp contacts. With a mating type of bayonet coupling and shell style of straight plug, they are suitable for a wide range of circular connector applications.