Sensor-mounting devices are disclosed. A sensor mounting device has a tubular body having a front end, a rear end, and a through hole that extends between the front and rear ends. The tubular body front end includes a flange with a perimeter that is larger than a perimeter of the tubular body. The flange may be positioned at a front face of a mounting structure. A sensor-attachment structure is located on at least one of the tubular body and the front flange. Further locking structure extends from the tubular body to couple the tubular body to the mounting structure. The locking structure is at least one item from the group consisting of: a rear flange, a barb, and threading.