The MIL-DTL-38999 Series II connectors offer durable and reliable performance in harsh environments, with up to 128 contacts housed in an environmentally sealed insert. Designed for military specifications, these connectors feature various mounting options including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and plated with options like electroless nickel, they ensure longevity and conductivity. With a wide operating temperature range of -65 °C to 200 °C, these connectors are suitable for demanding applications.