MIL-DTL-38999 Series I connectors offer robust performance with up to 128 contacts in an insert. Designed for harsh environments, they are sealed and can operate between -65 °C and 200 °C. Featuring various mounting options like front and rear wall mounts and jam nut receptacles, they ensure secure connections. With 52 insert arrangements and M39029 rear release crimp contacts, they provide versatility in applications. The high-strength aluminum shells come in different plating options, including cadmium-free finishes, meeting RoHS compliance. These circular connectors, known for their reliability, are ideal for demanding military and industrial environments.