MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert and offering a wide operating temperature range from -65 °C to 200 °C. These connectors, available in aluminum shells, come in various mounting styles such as front and rear wall mount, jam nut, and box mount receptacles. With 52 insert arrangements and M39029 rear release crimp contacts, they ensure secure connections. Plating options include cadmium-free finishes like electroless nickel, meeting RoHS compliance. Perfect for military and industrial applications, these connectors provide reliable performance with their rugged construction and environmental sealing.