MIL-DTL-38999 Series I connectors are versatile and rugged, designed for harsh environments with up to 128 contacts. These circular receptacles feature front wall mount, rear wall mount, and jam nut options, providing flexibility in installation. With a wide operating temperature range of -65 °C to 200 °C, they ensure reliability in extreme conditions. Made of high-strength aluminum, they come in various plating options including cadmium-free finishes, meeting RoHS standards. The connectors are environmentally sealed and use M39029 rear release crimp contacts, ensuring secure and reliable connections. Suitable for military and industrial applications, they offer excellent conductivity and ingress protection, making them ideal for demanding environments.