MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, providing durability in harsh environments with an operating temperature range of -65 °C to 200 °C. These connectors come in various mount types such as 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. Constructed with aluminum shells, they offer plating options like electroless nickel and cadmium finishes. With a bayonet coupling and gold contact plating, these connectors ensure reliable connectivity with a mating life of 500 cycles. Designed for environment-resistant applications, they are suitable for military and industrial use.