The MIL-DTL-38999 Series II connectors offer robust connectivity with up to 128 contacts in an environmentally sealed insert, suitable for extreme operating temperatures ranging from -65 °C to 200 °C. Designed for harsh environments, these thin-walled connectors come in various mounting styles including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they feature gold-plated removable crimp contacts for reliable performance. Constructed with aluminum shells and offering a choice of plating options, including RoHS-certified finishes, these connectors ensure durability and conductivity in demanding applications.