The MIL-DTL-38999 Series II connectors are designed for harsh environments, offering reliable performance with up to 128 contacts in an insert. These circular connectors feature various mounting options such as front and rear wall mount, jam nut, and box mount receptacles. With a wide operating temperature range of -65°C to 200°C, they are suitable for demanding applications. The connectors are constructed with aluminum shells and come in different plating options including cadmium and nickel for corrosion resistance. Utilizing M39029 rear release crimp contacts, they ensure secure connections. RoHS compliant finishes are available, making them environmentally friendly. Ideal for military and industrial use, these connectors guarantee durability and conductivity in challenging conditions.