The OF30 is a small-sized single turn and general purpose type potentiometer with an outer diameter of 32mm.

Lower resistance values (50Ω to 200Ω), extra taps (available up to 1 tap), special electrical travel, shaft dia. (ø 3.175mm) · bushing with inch dimensions, special machining on the shaft, with stopper (rotating angel becomes 300º and stopper strength is 0.3N·m [3kgf·cm]).