The MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65°C to 200°C. Available in various shell sizes and insert arrangements, they offer versatility with M39029 rear release crimp contacts. These connectors, with front wall mount, rear wall mount, and jam nut receptacles, boast RFI grounding plugs for enhanced performance. Constructed with high-strength aluminum shells and a choice of plating options, including RoHS-compliant finishes, they ensure reliable connectivity. The MS27505 connectors, specifically designed for back panel box mounting, employ crimp-type, bayonet coupling for secure installations. With gold-plated contacts and electroless nickel coating, they guarantee optimal conductivity and durability, meeting stringent military specifications for environmental resistance.