MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, with an operating temperature range of -65 °C to 200 °C. These harsh environment connectors come in various styles including front and rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts. Constructed with aluminum shells, they offer plating options such as cadmium and nickel. With RoHS compliant finishes, these connectors are ideal for military and aerospace applications requiring reliable performance in challenging conditions.