MIL-DTL-38999 Series II connectors feature up to 128 contacts in an environmentally sealed insert, suitable for harsh environments with an operating temperature range of -65 °C to 200 °C. These 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 utilize M39029 rear release crimp contacts. Constructed with aluminum shells, they offer options for plating such as cadmium-free finishes. Ideal for military and aerospace applications, these connectors ensure reliable performance with their gold-plated contacts, meeting stringent MIL-DTL-38999 II specifications.