MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, offering environmental sealing and a wide operating temperature range from -65 °C to 200 °C. These harsh environment connectors come in various configurations including front wall mount, rear wall mount, jam nut, and box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they use M39029 rear release crimp contacts for reliable connectivity. Constructed with aluminum shells and offering multiple plating options, including cadmium-free finishes, these connectors ensure durability and performance. Suitable for military and industrial applications, they provide a secure and conductive connection, meeting stringent quality standards for demanding environments.