MIL-DTL-38999 Series I connectors offer robust connectivity with up to 128 contacts in an environmentally sealed insert. Designed for harsh environments, these connectors feature front and rear wall mount options, as well as jam nut receptacles, all ensuring secure installations. With 52 insert arrangements available, they accommodate various contact sizes, including M39029 rear release crimp contacts. The high-strength aluminum shells come in 9 shell sizes, plated with options like electroless nickel for durability. With a wide operating temperature range of -65 °C to 200 °C, these connectors are ideal for demanding applications that require reliable performance.