Through shaft fixture, whose character is: including standard set, dial indicator, dial indicator, lock screw and a fixed set of standard condoms in the former through active cylindrical gear assembly of shaft and axle differential between assembly parts and with active cylindrical gear assembly and differential between shaft assembly in standard size, the same dial indicator set set in the first through the front of the shaft, dial indicator is mounted on the dial indicator set of the perforation The locking screw penetrates the blind hole arranged by the dial gauge sleeve into the perforated fixed dial gauge, the standard sleeve is connected with the fixed sleeve through a screw, and the fixed sleeve is fixed at the bearing assembly of the front through-through shaft. The utility model to standard suit into active cylindrical gear assembly and differential between shaft assembly in place, good will tighten dial indicator dial indicator set placed in front of such a dial indicator measuring head wine under the action of spring force and the standard set of end face have a difference, this difference is combined with the actual length of the standard set for the actual value.