The MIL-DTL-38999 Series I connectors feature up to 128 contacts in an insert with environmental sealing, ensuring reliable performance in harsh conditions. Designed for a wide operating temperature range of -65 °C to 200 °C, these connectors come in various configurations including front wall mount, rear wall mount, and jam nut receptacles, all meeting stringent military specifications. Available in 9 shell sizes and 52 insert arrangements, they utilize M39029 rear release crimp contacts for secure connections. Constructed with high strength aluminum shells and offering multiple plating options, including RoHS compliant finishes, these connectors provide durability and versatility for demanding applications.