MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert and are designed for harsh environments, with an operating temperature range of -65 °C to 200 °C. Available in various mounting options like front wall mount and jam nut receptacles, they offer versatility for different applications. These connectors come in aluminum shells with plating options including cadmium-free finishes, ensuring durability and compliance with RoHS regulations. With 52 insert arrangements and M39029 rear release crimp contacts, they provide reliable connectivity for military and aerospace systems.