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 configurations such as front wall mount, rear wall mount, and jam nut receptacles, they offer RFI grounding options. Compliant with military specifications, these connectors come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts. Constructed with high strength aluminum shells and offering multiple plating choices including cadmium-free finishes, they ensure durability and reliability in demanding applications. Suitable for use in environments requiring conductivity and ingress protection, these connectors are ideal for aerospace, defense, and industrial applications.