MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, ideal for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in front wall mount, rear wall mount, and jam nut receptacles, they ensure secure connections. With 52 insert arrangements and M39029 rear release crimp contacts in various sizes, including coax and twinax, these connectors offer versatility. Constructed with high-strength aluminum shells and plated in options like electroless nickel and cadmium finishes, they guarantee durability. RoHS certified versions are also available, meeting environmental standards. Perfect for military applications, these connectors provide reliable performance with a service rating of I.