The MIL-DTL-38999 Series I connectors offer durable performance in harsh environments with up to 128 contacts contained in an insert. Designed for a wide operating temperature range of -65°C to 200°C, these connectors are environmentally sealed for reliable protection. Featuring various mounting options including front wall mount, rear wall mount, and jam nut receptacles, they ensure secure connections. The connectors come in 9 shell sizes and 52 insert arrangements, accommodating M39029 rear release crimp contacts. Constructed with high-strength aluminum shells and available in RoHS certified finishes, they provide versatility and longevity. With gold contact plating and a bayonet mating type, these connectors guarantee efficient conductivity and easy installation. Perfect for military and industrial applications requiring sturdy and reliable electrical connections.