The PDB181-K420K-203B is a 17 mm rotary potentiometer from Bourns' PDB18 Series, featuring a metal knurled shaft with 18-tooth serration and vertical down-facing PC pins (12.5 mm). It is configured with a linear audio taper, no detents, and a 20 mm standard shaft length, delivering a 420 kO resistance value with ±20% tolerance. The potentiometer operates over a temperature range of -10°C to +50°C with a maximum operating voltage of 150 V (audio configuration) and a power rating of 0.1 watt. It exhibits a mechanical angle of 300° ±5°, rotational torque of 10 to 150 gf-cm, and a rotational life of 15,000 cycles, making it suitable for audio/TV sets, car radios, amplifiers, mixers, synthesizers, and other consumer electronics requiring precise volume or tone control.