The MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts housed in a secure insert. With a wide operating temperature range of -65°C to 200°C, these connectors are ideal for demanding applications. Available in various mounting styles including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility in installation. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts in multiple sizes. Constructed with aluminum shells and offering plating options such as electroless nickel and cadmium finishes, they ensure durability and reliability. These RoHS compliant connectors are suitable for military and industrial use, providing a high level of performance and protection against environmental factors.