Keystone Electronics Corp. TO-3 Transistor Insulator 4667

The 4667 is a mica transistor insulator designed for TO-3 cases, with a thickness of 0.003 inches (0.08 mm) and a diameter of 0.045 inches (1.14 mm) for the mounting holes, featuring two holes spaced for standard TO-3 transistors. It provides high dielectric strength and thermal conductivity, with a maximum operating temperature of 1100°F (593°C). The material is precision-stamped mica consistent with the series specification for thermal resistance and dielectric constant at 1000 kHz.