MIL-DTL-38999 Series I connectors offer high-performance connectivity with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, these connectors feature front wall mount, rear wall mount, and jam nut receptacles, along with RFI grounding plugs. With 9 shell sizes and 52 insert arrangements, they accommodate M39029 rear release crimp contacts in various sizes. Constructed with durable aluminum shells and available in different plating options, including cadmium-free finishes, these connectors ensure reliable operation in temperatures ranging from -65°C to 200°C. Ideal for military and industrial applications, they offer secure mating with bayonet coupling, gold-plated contacts for optimal conductivity, and a service life of 500 cycles. RoHS compliant and with ingress protection, they meet stringent quality standards for demanding environments.