MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating between -65°C and 200°C, these connectors offer durability in extreme conditions. Available in various styles including front and rear wall mount, jam nut, and box mount receptacles, they provide versatile connectivity options. With 52 insert arrangements and M39029 rear release crimp contacts, customization is seamless. Constructed with aluminum shells and plated in options like electroless nickel and cadmium finishes, these connectors ensure reliable performance. RoHS certified for environmental compliance, they are ideal for military and industrial applications requiring rugged, high-quality connectivity solutions.