MIL-DTL-38999 Series I connectors feature up to 128 contacts in an environmentally sealed insert, designed for harsh environments with an operating temperature range of -65 °C to 200 °C. Available in various shell sizes and insert arrangements, they offer front and rear wall mount as well as jam nut receptacles. Utilizing M39029 rear release crimp contacts, these connectors come in high-strength aluminum shells with options for plating, including cadmium-free finishes. Ideal for military and industrial applications, they ensure reliable performance with a mating life of 500 cycles and are RoHS compliant for environmentally conscious operations.