MIL-DTL-38999 Series I connectors are rugged and reliable, designed for harsh environments with up to 128 contacts in an insert. These circular receptacles feature front wall mount, rear wall mount, and jam nut configurations, offering versatility in installation. With MIL-DTL-38999 I military specification compliance, they ensure high performance and durability in demanding applications. Operating between -65°C and 200°C, these connectors are environmentally sealed for protection. Made of high-strength aluminum, they come in various shell sizes and insert arrangements, accommodating M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 8. Plating options include electroless nickel, cadmium olive drab, and others, meeting different environmental requirements. Suitable for use in aerospace, military, and industrial settings, these connectors offer reliable connectivity in critical systems.