MIL-DTL-38999 Series II connectors with up to 128 contacts offer robust environmental sealing and a wide operating temperature range of -65 °C to 200 °C. Designed for harsh environments, these thin-walled connectors feature various mounting options including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells and offering plating options such as gold, electroless nickel, and cadmium finishes, these connectors ensure reliable performance. With a bayonet coupling and conductivity, they meet stringent military specifications for durability and are suitable for applications requiring environment-resistant, conductive connectivity.