MIL-DTL-38999 Series II connectors are designed for rugged environments, featuring up to 128 contacts in an insert for robust connectivity. With an impressive operating temperature range of -65 °C to 200 °C, these connectors are ideal for extreme conditions. Available in various styles such as front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in installation. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating different contact sizes and configurations. Constructed with aluminum shells and plated with options like electroless nickel, they ensure reliable performance while meeting RoHS compliance standards. Suitable for military and industrial applications, these connectors guarantee durability and conductivity, with a service rating of I and a mating life of 500 cycles.