MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With a wide operating temperature range of -65 °C to 200 °C, these connectors are built for durability. Offering various mounting options such as front wall, rear wall, and jam nut receptacles, they cater to diverse installation needs. The connectors, compliant with military specification MIL-DTL-38999 I, come in 9 shell sizes and 52 insert arrangements, accommodating different contact sizes and types, including M39029 rear release crimp contacts. Constructed with high-strength aluminum shells and available in multiple plating options, including cadmium-free finishes, they ensure reliable performance in demanding applications. Suitable for wall and jam nut mounting receptacles and plugs, these connectors provide secure and efficient connectivity in challenging environments.