MIL-DTL-38999 Series II connectors are designed for harsh environments, with up to 128 contacts per insert and a wide operating temperature range of -65 °C to 200 °C. These connectors, featuring front wall mount, rear wall mount, jam nut, and box mount receptacles, offer versatility in installation. Available in various shell sizes and insert arrangements, they use M39029 rear release crimp contacts for reliable connections. Constructed with aluminum shells and offering plating options including cadmium and nickel, these connectors ensure durability. With EMI/RFI shielding and RoHS compliance, they provide secure and environmentally friendly connectivity solutions for military and industrial applications.