MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with operating temperatures ranging from -65 °C to 200 °C. The thin-walled, restricted-length connectors come in various mounting options such as front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, these connectors utilize M39029 rear release crimp contacts in multiple sizes. Constructed with aluminum shells and offering plating options like electroless nickel and cadmium finishes, they ensure durability and reliability. With gold-plated removable crimp contacts, bayonet coupling, and a straight plug design, these connectors are suitable for diverse applications requiring secure and efficient electrical connections in challenging environments.