Socket spanner with adjustable spacing

The invention relates to a socket spanner with an adjustable spacing. Two symmetrical wings of a T-shaped spanner body are provided with inner groove guide rails; sliding blocks are matched with the inner groove guide rails, have the same thicknesses with the inner groove guide rails and are in slide fit with the inner groove guide rails; the sliding blocks are arranged in the inner groove guide rails and can slide along the inner groove guide rails; the centers of the sliding blocks are provided with spline holes; the middle parts of spline inserted pins are matched with the spline holes; screw threads of small heads at the tops of the spline inserted pins are occluded with butterfly nuts; and inserted heads below big round heads at the bottoms of the spline inserted pins are matched with small holes for fastening the end faces of round nuts to be screwed down. The spline inserted pins are inserted into the spline holes; the symmetrical T-shaped spanner body center line is translated along the inner groove guide rails of the two wings, so that the inserted heads are matched and aligned with the hole pitch of the small holes for fastening the end faces of the round nuts to be screwed down; the butterfly nuts are screwed down; and the spline inserted pins are fastened in the corresponding positions in the inner groove guide rails. Due to the adjustable spacing of the spline inserted pins, the socket spanner can adapt to various specifications of hole pitches of the small holes for fastening the end faces of the round nuts to be screwed down and can be used for carrying out installation and disassembly on different specifications of round nut sealing cylindrical parts.