MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with 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 aluminum shells with plating options such as electroless nickel and cadmium finishes, they meet RoHS standards. With M39029 rear release crimp contacts, these connectors ensure reliable performance with a contact mating life of 500 cycles. Suitable for military and industrial applications, they offer secure connectivity in demanding conditions.