MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an insert and environmental sealing. With an operating temperature range of -65 °C to 200 °C, these connectors offer durability in extreme conditions. Available in various receptacle styles such as front wall mount, rear wall mount, jam nut, and more, they provide versatile connectivity options. The connectors, made of aluminum, come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts. Plating options include cadmium-free finishes like electroless nickel, ensuring compliance with RoHS standards. Suitable for military and industrial applications, these connectors guarantee reliable performance in demanding settings.