Dedicated tool for measuring thickness of steel rail limb

The utility model discloses a dedicated tool for measuring the thickness of a steel rail limb, and a main ruler is provided with a measuring jaw which is fixedly connected with the main ruler in a vertical manner. The measuring jaw has an arc-shaped surface which has the same slope with the upper surface of a measured rail limb. A vernier scale is sleeved on the main ruler and slides along the main ruler. The main ruler takes millimeter as unit. A vernier is provided with 50 scale divisions, each of which has a precision 0.02 mm. The tool is advantageous in that the tool irons out the defect that a conventional caliper cannot achieve accurate positioning and measurement through three-surface positioning; the tool can be made into a corresponding measurement tool for a rail of each type, so as to meet the demands of quality control of raw materials of rails of each type and the processing and measurement of rail pieces; the precision of the tool reaches 0.02 mm; and the tool is an innovation for the measurement tool for the steel rail limb.