Board type external diameter dial indicator

The utility model specifically provides a board type external diameter dial indicator, and solves problems that dimensional measurement of an existing rotating shaft grinding bearing site uses an external diameter dial indicator which is high in reject ratio, low in production efficiency, and relatively high in manufacturing cost. The board type external diameter dial indicator comprises a U-shaped board, and the left end face of an upper rod of the U-shaped board is provided with a vertical clamping groove towards the right. A vertical adjusting hole is disposed in the clamping groove. A sleeve is disposed through the adjusting hole. The upper end of the sleeve is fixedly provided with a dial indicator. A movable measuring rod is disposed in the sleeve. A pre-tightening spring is sleeved on the movable measuring rod. The upper rod of the U-shaped board is provided with a lock screw. The lower rod of the U-shaped board is provided with a fixed measuring rod. The U-shaped board is screwed with forcing screws.