SMLease Design

Mechanical Product Design & Development Partner

Angularity : GD&T Basics

  • Angularity is used to constrain the orientation of  one feature w.r.t. datum at specified angle.
  • Angularity tolerance zone will be two parallel planes /surfaces in 3D. All points on controlled feature should lie within defines planes.
  • Maximum material condition can be used along with angularity tolerance.
  • Datum plane is required to define angularity tolerance.
  • Angularity tolerance can also be used to control the axis of any feature w.r.t datum plane.
  • Tolerance zone for angularity for an axis will be a cylinder around theoretically exact axis w.r.t. datum plane.
  • Angularity can be used to control the critical feature at an angle where assembly is happening at an angle.


Angularity Representation 

Tolerance Zone

Tolerance zone for angularity will be two parallel planes/lines at the specified angle w.r.t. datum Plane. All points on given surface must lie into given tolerance zone 





Measurement of Angularity Tolerance

Angularity tolerance of a part is measured by fixing part at given angle  w.r.t. base plane . Surface to be measured is  made parallel to surface plate. Dial gauge is  used to calculate the value of deviation from true surface.

Where Angularity Tolerance is Used

Angularity is used to control the angle of a surface  w.r.t. another datum surface. Angularity  is used to control flatness of a surface  at any angle w.r.t. datum surface.

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