GD&T Profile Definition

In GD&T, profile tolerance defines a uniform boundary around a surface within which the elements of the surface must lie.  Profile is a complex tolerance that simultaneously controls a feature's form, size, orientation, and sometimes location.  Profile is a three-dimensional tolerance that applies in all directions regardless of the drawing view where the tolerance is specified.  It is usually used on parts with complex outer shape and a constant cross-section like extrusions. 

An example of profile tolerance is shown below.  The top figure shows the profile tolerance applied to a curved surface.  The boxed symbols can be read "with respect to datum A, this surface must lie between two surface boundaries 0.8 apart and spaced equally about the true (or ideal) surface profile".  The bottom figure shows an example of a part that meets this tolerance. 

Profile3

Was this article helpful? YesSomewhatNo

Free CAD Software

Easy to use. Expert feedback. Real-time pricing.

Get Our FREE CAD Software

Already have a CAD Drawing?

Send us your file for a quote.

Request a Quote

May I send you my tutorials and tips?

Subscribe Now
Video Tutorial

Testimonials

This is my first time using CAD software and in a few minutes I designed what I needed. The software is extremely easy to use. What a great tool. It ...

- Barre Wheatley

View all Testimonials >>