53AAA-B24-A18L is a sealed 1/2" (12.5 mm) square control potentiometer from Bourns' 51/53 series, featuring solder lug terminals and a double section configuration without detent. It utilizes a linear conductive plastic element with 50K ohm resistance and ±20% tolerance. The unit features a 3/8" diameter x 3/8" length bushing configuration with a single flattened 1/4" diameter shaft. This RoHS compliant component is sealed for board washing and is commonly used in pro audio applications where precise resistance control is required.