The MIL-DTL-38999 Series I connectors offer robust performance with up to 128 contacts in an insert, ideal for harsh environments. These circular receptacles come in various mounting options such as front and rear wall mount, as well as jam nut receptacles, ensuring versatile installation. Featuring RFI grounding plugs, they provide reliable connectivity. With a wide operating temperature range of -65°C to 200°C, these connectors are built to withstand extreme conditions. Crafted with high-strength aluminum shells and available in different plating options, including RoHS-certified finishes, they ensure durability and environmental compliance. These connectors, utilizing M39029 rear release crimp contacts, guarantee secure connections with 500 mating cycles. Conductive and environment-resistant, they are suitable for a range of applications in aerospace, defense, and industrial settings.