The Amphenol PT series and PT-SE series connectors (MIL-DTL-26482 Series I) feature high-density contact arrangements within a circular shell. The PT series offers solder contacts, while PT-SE provides high-performance crimp contacts, and PT-CE (not specified here) offers a commercial crimp option. These circular connectors include quick-disconnect bayonet coupling for fast mating and unmating, along with multiple mounting styles and shell sizes, suitable for various applications.