The MIL-DTL-38999 Series II connectors are designed for harsh environments, offering up to 128 contacts in an environmentally sealed insert. With a wide operating temperature range of -65°C to 200°C, these connectors are suitable for demanding applications. Featuring various mounting options such as front and rear wall mount, jam nut, and box mount receptacles, they provide versatility in installation. Available in 9 shell sizes and 52 insert arrangements, with M39029 rear release crimp contacts, they ensure reliable connectivity. Constructed with aluminum shells and offering multiple plating options, including cadmium-free finishes, these connectors meet stringent military specifications for durability and performance. Suitable for use in a range of industries, they provide secure and efficient electrical connections in challenging conditions.