The MIL-DTL-38999 Series II connectors are designed for harsh environments, with up to 128 contacts and environmental sealing for reliable performance. Operating between -65 °C and 200 °C, they offer versatility in extreme conditions. Featuring various mounting options such as front and rear wall mount, jam nut, and box mount receptacles, they cater to diverse connectivity needs. Available in 9 shell sizes and 52 insert arrangements, these connectors use M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and plated with options like electroless nickel, they ensure durability and conductivity. RoHS certified finishes are also offered, meeting environmental standards. Suitable for military and industrial applications, these connectors guarantee high reliability with 500 mating cycles.