MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Offering various mounting options including front and rear wall mount, jam nut, and box mount receptacles, they ensure secure connections in demanding applications. Available in 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts for reliable performance. Constructed with aluminum shells and plated with options like electroless nickel and cadmium finishes, they meet stringent military specifications. With a straight plug configuration, gold-plated contacts, and a maximum operating temperature of 150 °C, they guarantee durable and efficient connectivity in aerospace, defense, and industrial settings.