MIL-DTL-38999 Series II connectors feature up to 128 contacts, offering environmental sealing and a wide operating temperature range from -65 °C to 200 °C. These harsh environment thin-walled connectors come in various receptacle styles including front and rear wall mount, jam nut, and box mount options. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts in sizes 22D, 22M, 22, 20, 16, and 12. Constructed with aluminum shells and offering multiple plating options such as electroless nickel and cadmium finishes, they meet stringent military specifications for reliability. With a straight plug design, gold contact plating, and EMI/RFI shielding, these connectors ensure secure and efficient electrical connections even in demanding applications.