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Dimensioning Hole Depth

Question asked by Wing Hoe Tan on Feb 25, 2018
Latest reply on Sep 15, 2020 by Dave Laban

Hi all, a general question to all engineers out there regarding dimensioning of hole depth in drawings. In hole wizard, the hole depth is defined as the distance from the surface to the cylindrical edge (5 mm in the example) below. If you measure from the tapered point, the depth is slightly more at 5.75 mm.

  1. In the hole callout, do you specify 5 mm or 5.75 mm? Is there a universal convention for this? How do machinists interpret the callout?
  2. Is it customary to provide a detailed cross-section to prevent confusion?