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IEC 60390: Shaft Ends and Bushings for Manual Electronic Components — Mechanical Interface for Potentiometers and Encoders
Why Any Knob Fits Any Potentiometer — Shaft End and Bushing Standardization
IEC 60390:1972 specifies shaft ends and bushings for manual electronic components (potentiometers, encoders, rotary switches). The 6 mm (¼”) shaft diameter with D-cut or slotted design is the most common standard. IEC 60390 ensures any brand knob fits any brand potentiometer.
TNLab — Shaft end standardization enables global knob interchangeability across audio, instrumentation, and industrial equipment.
