## Fig Profile Tolerancing Of A Conical Feature Datum Related

ance is equal to the amount of such departure. See Figs. 6-41 and 6-42.

6.6.1.3 Tangent Plane. Where it is desired to control a feature surface established by the contacting points of that surface, the tangent plane symbol is added in the feature control frame after the stated tolerance. See Fig. 6-43.

6.6.2 Angularity. Angularity is the condition of a surface, center plane, or axis at a specified angle (other than 90°) from a datum plane or axis.

6.6.2.1 Angularity Tolerance. An angularity tolerance specifies one of the following:

(c) a tolerance zone defined by two parallel planes at the specified basic angle from one or more datum planes or a datum axis, within which the surface or center plane of the considered feature must lie. See Fig. 6-27.

(b) a tolerance zone defined by two parallel planes at the specified basic angle from one or more datum planes or a datum axis, within which the axis of the considered feature must lie. See Fig. 6-28.

(c) a cylindrical tolerance zone at the specified basic angle from one or more datum planes or a datum axis, within which the axis of the considered feature must lie. See Fig. 6-29.

(d) a tolerance zone defined by two parallel lines at the specified basic angle from a datum plane or axis, within which the line element of the surface must lie.

6.6.3 Parallelism. Parallelism is the condition of a surface or center plane, equidistant at all points from a datum plane; or an axis, equidistant along its length from one or more datum planes or a datum axis.

6.6.3.1 Parallelism Tolerance. A parallelism tolerance specifies one of the following:

(a) a tolerance zone defined by two parallel planes parallel to a datum plane or axis, within which the surface or center plane of the considered feature must lie. See Fig. 6-30.

(b) a tolerance zone defined by two parallel planes parallel to a datum plane or axis, within which the axis of the considered feature rnusl lie. Sec Fig. 6-31.

(c) a cylindrical tolerance zone parallel to one or more datum planes or a datum axis, within which the axis of the feature must lie. See Figs. 6-32 and 6-33.

(d) a tolerance zone defined by two parallel lines parallel to a datum plane or axis, within which the line element of the surface must lie. See Fig. 6-45.

6.6.4 Perpendicularity. Perpendicularity is the condition of a surface, center plane, or axis at a right angle to a datum plane or axis.

6.6.4.1 Perpendicularity Tolerance. A perpendicularity tolerance specifies one of the following:

(a) a tolerance zone defined by two parallel planes perpendicular to a datum plane or axis, within which the surface or center plane of the considered feature must lie. See Figs. 6-34 through 6-36.

(b) a tolerance zone defined by two parallel planes perpendicular to a datum axis, within which the axis of the considered feature must lie. See Fig. 6-37.

(c) a cylindrical tolerance zone perpendicular to a datum plane, within which the axis of the considered feature must lie. See Figs. 6-38 through 6-42.

(d) a tolerance zone defined by two parallel lines perpendicular to a datum plane or axis, within which the line element of the surface must lie. See Fig. 6-44.