MIL-DTL-38999 Series II connectors are designed for harsh environments, with up to 128 contacts in an insert and environmental sealing. Operating between -65 °C and 200 °C, these connectors come in various configurations 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 like electroless nickel and cadmium finishes, they ensure durability and reliability. Suitable for military and industrial applications, these connectors are RoHS compliant, making them ideal for a wide range of projects.