MIL-DTL-38999 Series II connectors offer high-performance connectivity with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, they 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, these connectors use M39029 rear release crimp contacts for reliable connections. Constructed with aluminum shells and plated with options like electroless nickel, they ensure durability and RoHS compliance. With a wide operating temperature range of -65 °C to 200 °C, these connectors are ideal for military and aerospace applications.