A device and a system monitor wear of wearable components mounted in a mining equipment. An elongated bolt maintains a wearable component in place on a face of the equipment. A threaded section of the bolt terminates at a proximal end protruding externally through a hole of the equipment. A shank of the bolt terminates at a distal end opposite from the proximal end. The shank extends along a thickness of the wearable component and wears as the wearable component wears when the equipment is in operation. A transducer coupled to the proximal end of the bolt generates a sound wave within the bolt, detects an echo of the sound wave reflected by the distal end of the bolt, and reports to a controller a time delay between the sound wave and the echo. The controller evaluates a wear of the wearable component based on the time delay.