MIL-DTL-38999 Series I connectors feature up to 128 contacts housed in an environmentally sealed insert, ideal for harsh environments. With an operating temperature range of -65 °C to 200 °C, these connectors come in various shell sizes and insert arrangements, accommodating M39029 rear release crimp contacts in multiple sizes. Constructed with high-strength aluminum shells, they offer versatility with plating options like cadmium and nickel. Offering reliable performance with a lifespan of 500 mating cycles, these connectors are suitable for demanding applications requiring conductivity and environmental resistance.