GD&T is a complicated subject and understanding it correctly can be the difference between a perfect part and scrap. There is no difference between the requirements of the example below or the previous one. A radius if drawn correctly will have some form of a +/- tolerance or be controlled through a GD&T requirement such as profile or cylindricity. Because there are no specific requirements for a full radius referenced by any drawing or GD&T standards, there is no difference in the requirements of a full radius or full R vs a radius or R.

There is no difference between the drawing callouts of full radius, true radius and radius. When a full radius, true radius or full R is called out on the drawing, the blueprint drafter is attempting to control the blend into and out of the specified radius. How to measure a full radiusīecause no reference standard documents the requirements of a full radius, there are no specific requirements for the callout.

The full radius callout is referencing a smooth transition from the radius to an adjacent surface. Full radius is most often specified in a rounded slot feature or a feature that mimics a rounded slot.Ī full radius sometimes noted as a true radius or full R is outdated language and not part of the current revision of the drawing standard ASME Y14.5. A full radius is a radius that smoothly blends into another surface.

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