The MIL-DTL-38999 Series I connectors offer up to 128 contacts in an insert, designed for harsh environments with a wide operating temperature range from -65°C to 200°C. Featuring front and rear wall mount options, as well as jam nut receptacles, these connectors provide reliable RFI grounding. With 9 shell sizes and 52 insert arrangements available, they use M39029 rear release crimp contacts in various sizes. Constructed with high-strength aluminum shells, they come in different plating options, including RoHS-certified cadmium-free finishes. Ideal for military and aerospace applications, these connectors ensure durability and conductivity with a mating life of 500 cycles.