The MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With an operating temperature range from -65 °C to 200 °C, these connectors offer reliability in extreme conditions. Available in various shell sizes and insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. Constructed with high-strength aluminum shells and offered in different plating options, including RoHS-certified finishes, these connectors ensure durability and performance. Suitable for military and industrial applications, they come in straight plug configuration with gold-plated removable crimp contacts, ideal for wall and jam nut mounting receptacles. With a mating type of bayonet and keyway polarization of N, these connectors provide efficient conductivity and ingress protection, meeting stringent environmental standards.