The MIL-DTL-38999 Series II connectors, compliant with military specification, offer reliable performance in harsh environments. With up to 128 contacts in an insert, these circular receptacles are designed for back panel wall mounting, featuring various configurations such as front and rear wall mount, jam nut, and box mount receptacles. Constructed with aluminum shells and available in different plating options, including RoHS certified finishes, they ensure durability and conductivity. Utilizing M39029 rear release crimp contacts, they provide secure connections for applications requiring up to 500 mating cycles. With a wide operating temperature range of -65 °C to 200 °C, these connectors are ideal for use in demanding settings.