The MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various mounting options like front and rear wall mount, jam nut, and box mount, these connectors offer versatility. With 52 insert arrangements and M39029 rear release crimp contacts in multiple sizes, they ensure reliable connectivity. Constructed with aluminum shells and offering plating options like electroless nickel and cadmium finishes, they meet diverse application needs. RoHS compliant versions are also available, making them suitable for environmentally conscious projects.