330620 is a panel insulating bushing designed for use with BNC bulkhead jacks in RF coaxial connector assemblies. Constructed from nylon material, this bushing provides electrical isolation between the connector body and the mounting panel. The bushing features an outer diameter of 12.93 mm (0.509 in) and requires a recommended panel cutout diameter of 14.73±0.13 mm (0.580±0.005 in). Two bushings are required per installation, and the component is not compatible with single crimp bulkhead jacks. This insulating bushing is commonly used in 50 ohm BNC connector applications where panel isolation is required for proper RF signal integrity.