MIL-DTL-38999 Series II connectors are designed for harsh environments, featuring up to 128 contacts in an environmentally sealed insert. With an operating temperature range of -65 °C to 200 °C, these connectors offer durability in extreme conditions. Available in various mounting styles, including front and rear wall mount, jam nut, and box mount receptacles, they provide flexibility in installation. The aluminum shells come in different plating options, such as cadmium-free finishes, ensuring compliance with RoHS regulations. Utilizing M39029 rear release crimp contacts, these connectors offer reliability with 500 mating cycles. The 20-41 shell size arrangement, with gold-plated removable crimp contacts, caters to specific connectivity needs. Suitable for military and industrial applications, these connectors guarantee optimal performance in demanding environments.