MIL-DTL-38999 Series II connectors offer robust performance with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, these connectors feature 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 utilize M39029 rear release crimp contacts for reliable connectivity. The aluminum shells come in plating options including cadmium and nickel, meeting RoHS certification standards. With a wide operating temperature range of -65 °C to 200 °C, these connectors are ideal for demanding applications that require durability and high performance.