The 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, they offer reliability in extreme conditions. Available in various mounting styles, including front and rear wall mount, jam nut, and box mount receptacles, these connectors are versatile. With 52 insert arrangements and M39029 rear release crimp contacts, they ensure secure connections. Constructed with aluminum shells and offering multiple plating options, such as cadmium and nickel, they meet diverse needs. RoHS compliant finishes are also available. Ideal for military and industrial applications, these connectors provide durability and performance, with a service rating of M and service class of E.