MIL-DTL-38999 Series I connectors are designed for harsh environments, featuring up to 128 contacts in an insert. These connectors are environmentally sealed, with an operating temperature range of -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they offer versatility for different applications. Made with high-strength aluminum shells and offering multiple plating options, including RoHS-certified finishes, they ensure durability and reliability. The connectors come in receptacle form, with options for front wall mount, rear wall mount, and jam nut configurations, providing flexibility for installation. Utilizing M39029 rear release crimp contacts, they guarantee secure and efficient connections. With a bayonet coupling mechanism and gold contact plating, these connectors offer high performance with 500 mating cycles. Suitable for box mounting, back panel, and through bulkhead applications, they are ideal for military and industrial use, meeting MIL-DTL-38999 I specifications for quality and performance in demanding environments.