The 3590S-1-203L is a precision wirewound potentiometer manufactured by Bourns, designed for use in human-machine interface (HMI) applications requiring accurate resistance adjustment and reliable performance. This model features a 20 kO nominal resistance with ±5% tolerance, independent linearity of ±0.25%, and a 360° effective electrical angle with ±10°, -0° tolerance, delivering 0.019% resolution. The potentiometer is equipped with solder lug terminals, a plastic bushing (3/8" × 5/16") with a shaft diameter of 0.2480 +0.001, -0.002 inches, and offers a starting and running torque of 0.85 N-cm maximum (unsealed). Key mechanical specifications include a stop strength of 45 N-cm minimum, shaft runout of 0.13 mm T.I.R., and a maximum backlash of 1.0°, with an approximate weight of 19 grams. The device is RoHS compliant and suitable for precision control applications in industrial and consumer electronics where stable, repeatable resistance adjustment is essential.