MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, providing environmental sealing and a wide operating temperature range from -65°C to 200°C. Designed for harsh environments, these connectors come in various configurations including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes with 52 insert arrangements, they use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. These connectors, with aluminum shells, offer plating options such as light iridescent yellow cadmium, olive drab cadmium, electroless nickel, and black anodized aluminum. Compliant with RoHS regulations, they ensure reliable connectivity in demanding applications.