The MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various mounting options, including front and rear wall mount, jam nut, and box mount receptacles, they offer versatility for different applications. These connectors come in 9 shell sizes and 52 insert arrangements, utilizing M39029 rear release crimp contacts for reliable connections. Constructed with aluminum shells and offering multiple plating options, including cadmium-free finishes, they ensure durability and compliance with RoHS standards. Suitable for military and industrial use, these connectors provide secure and efficient electrical connectivity in demanding environments.