MIL-DTL-38999 Series II connectors are designed for rugged environments, featuring up to 128 contacts in an insert with environmental sealing. Operating efficiently in temperatures ranging from -65 °C to 200 °C, these connectors offer versatility with various mounting options including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for reliable connectivity. Crafted from aluminum, these connectors come with plating options such as cadmium and nickel, meeting RoHS compliance standards. With a focus on durability and performance, they are ideal for military and industrial applications requiring secure electrical connections in harsh conditions.