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spotface

spotface

(OP)
how do you call a "spotface" on the field of drawing.?

RE: spotface

On the drawing it is called out as "SF" (SF dia .XX).

  A spotface does not always require a depth.  If it is on an uneven surface, the depth defaults to the minimum required to achieve a full diameter.
  

RE: spotface

Here's an update, now that I have the references at hand.

While "SF" is a legitimate abbreviation for spotface,
the drawing callout per Y14.5 is the same as a counterbore callout, except that the depth may or may not be specified.  If it is not specified, it is the minimum depth to achieve the diameter.

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