MIL-DTL-38999 Series II connectors feature up to 128 contacts in an insert, providing robust environmental sealing and a wide operating temperature range of -65 °C to 200 °C. Designed for harsh environments, these connectors come in various configurations including front wall mount, rear wall mount, jam nut, rear box mount, and front box mount receptacles. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for reliable connectivity. Constructed with aluminum shells and offering multiple plating options, including RoHS compliant finishes, these connectors ensure durability and performance in demanding applications.