The specified
value for the projected tolerance zone is a minimum. The
specified tolerance applies only to the projection of
the hole indicated by the projected
tolerance.
The symbol is placed in the feature control frame as of
the 1994 Standard. Prior to this, the symbol was placed
in a separate frame under the feature control
frame.
The amount the
tolerance is projected is usually written next to the
symbol. For clarity the direction and height of the
projected tolerance may be indicated with a heavy chain
line drawn closely adjacent to an extension of the
center line of the hole. |