91A1D-B24-B18L is a Model 91 single-turn panel control potentiometer manufactured by Bourns, featuring a 5/8" square form factor with virtually infinite electrical circuit isolation. The device is available in multiple pin-out configurations with both metal and plastic shaft options, supporting resistance ranges from 100 ohms to 1 megohm depending on element type and taper selection. It offers independent linearity of ±5% and absolute minimum resistance of 2 ohms maximum for cermet elements, with total resistance tolerance options of 5% or 10%. The potentiometer is RoHS compliant and suitable for applications requiring reliable panel-mounted control in audio, instrumentation, and industrial equipment where precise resistance adjustment and circuit isolation are essential.