Chamfers are bevels. External chamfers are bevels at the end of a dowel or
shaft. Internal chamfers are bevels placed on the edges of a hole in an
object. Dimension chamfers by angle and a linear dimension or by two
linear dimensions. When specifying an angle and linear dimension, the linear
dimension is the distance from the indicated surface of the part to the start of
Use a note to specify 45° chamfers. Use this method only with 45° chamfers
as the linear value applies in either the longitudinal (internal) or radial
When depicting a chamfer of a round hole, follow the practice of
dimensioning as shown (figure 3-35, view C) except where the chamfer
diameter requires dimensional control. Also, apply this type of control to the
chamfer diameter on a shaft.
Figure 3-35 illustrates dimensioning chamfers, 45° chamfers, and internal
Figure 3-35.Dimensioning chamfers.