MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert, offering environmental sealing and a wide operating temperature range of -65 °C to 200 °C. Available in various shell sizes and insert arrangements, these connectors come in high-strength aluminum shells with options for plating including cadmium-free finishes. With front wall mount, rear wall mount, and jam nut receptacle options, they utilize M39029 rear release crimp contacts for secure connections. Designed for harsh environments, these connectors are ideal for military and aerospace applications, providing reliable performance with a mating life of 500 cycles.