Perpendicularity is the condition of a surface, axis, or line, which is 90 deg. ![]() of cylindrical zone parallel to datum axis A. The feature axis must lie within a 0.2 mm dia. The surface must lie between two parallel planes 0.12 mm apart, which are parallel to datum plane A.Ģ. Parallelism is the condition of a surface, line, or axis, which is equidistant at all, points from a datum plane or axis.ġ. ![]() The cylindrical surface must lie between two concentric cylinders one with a radius 0.25 mm larger than the other The surface must lie between two planes 0.25 mm apartĬircularity describes the condition on a surface of revolution (cylinder, cone, or sphere) where all points of the surface intersected by any plane (1) perpendicular to a common axis (cylinder, cone), or (2) passing through a common centre (sphere) are equidistant from the centre.Įach circular element of the surface in a plane perpendicular to the axis must lie between two concentric circles, one having a radius 0.25 mm larger than the otherĬylindricity describes a condition of a surface of revolution in which all points of a surface are equidistant from a common axis. ![]() Straightness describes a condition where an element of a surface or an axis is a straight line.įlatness is the condition of a surface having all elements in one plane. Various symbols used to specify tolerance zones are given below.GD&T has 14 geometric characteristic symbols.
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