MIL-DTL-38999 Series I connectors offer high-performance connectivity with up to 128 contacts, ideal for harsh environments. These circular receptacles, featuring jam nut mounting and bayonet coupling, are part of the military-specification 38999 Series I. With a rugged aluminum shell and various plating options including gold, electroless nickel, and cadmium olive drab, they ensure reliable operation in temperatures ranging from -65 °C to 175 °C. Utilizing M39029 rear release crimp contacts, they provide secure connections with male contact gender and a pin contact style. RoHS compliant finishes are available, catering to diverse application needs. Suitable for potting applications, these connectors guarantee longevity with a mating life of 500 cycles, making them essential for demanding environments.