MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert with environmental sealing. Operating in temperatures ranging from -65 °C to 200 °C, these connectors offer versatility with front wall mount, rear wall mount, jam nut, rear box mount, and front box mount receptacles. Available in various shell sizes and insert arrangements, they use M39029 rear release crimp contacts for secure connections. Constructed with aluminum shells and offering multiple plating options, including RoHS compliant finishes, these connectors ensure reliability in military and industrial applications.