MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65°C to 200°C. Available in 9 shell sizes and 52 insert arrangements, they offer versatility in applications. These connectors, with options for front wall mount, rear wall mount, and jam nut receptacles, are essential for military and aerospace use. Utilizing M39029 rear release crimp contacts, they ensure secure connections. Constructed with high-strength aluminum shells and various plating options like cadmium and nickel, they guarantee durability and reliability. RoHS compliant finishes are also available, making them environmentally friendly. With a bayonet coupling mechanism, they provide easy and efficient mating. Suitable for both wall and jam nut mounting, these MIL-DTL-38999 I connectors are ideal for demanding environments where rugged performance is crucial.