MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating between -65 °C and 200 °C, these connectors offer versatility with various mounting options such as front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts, ensuring secure connections. Made of aluminum, these connectors come in different plating options like cadmium and electroless nickel, meeting stringent military specifications for reliability. With RoHS compliant finishes, they guarantee performance in demanding applications.