The MIL-DTL-38999 Series I connectors are designed for harsh environments, with up to 128 contacts housed in an environmentally sealed insert. Operating efficiently in temperatures ranging from -65 °C to 200 °C, these connectors offer reliable performance. Available in various shell sizes and insert arrangements, they feature front and rear wall mount options, as well as jam nut receptacles. Utilizing M39029 rear release crimp contacts in multiple sizes, including coax and twinax, they ensure secure connections. Constructed with high-strength aluminum shells and offering plating options such as electroless nickel and cadmium finishes, these connectors are durable and versatile. Compliant with RoHS regulations, they are ideal for demanding military and industrial applications.