Simple detection tool for counter bores

The utility model discloses a simple detection tool for a counter bore. The simple detection tool comprises a slide bar; the reference table is of an annular structure, fixedly sleeves the sliding rod in a sleeving manner and is coaxially arranged with the sliding rod; the flange block is fixed at the front end part of the sliding rod, and the size of the flange block is matched with that of a to-be-detected counter bore; the sleeve sleeves the outer side of the flange block and is in sliding connection with the sliding rod; in an initial state, the sleeve is aligned with the front end portion of the flange block, the reference table is located outside the sleeve, the distance between the rear end face of the sleeve and the center section of the reference table is the design depth of a to-be-detected counter bore, and the distance between the front end face and the rear end face of the reference table is equal to the design tolerance range of the depth of the to-be-detected counter bore. According to the util