Controlled Radius

Defines a radius that must also be a smooth, fair curve without reversals.

2.00

Controlled radius is a radius requirement with an added contour quality requirement.

The surface must stay within the radial tolerance zone and remain continuous without reversals.

Use CR when a rough but in-zone radius is not functionally acceptable.

It is common where smooth load transfer, sealing, or fatigue behavior depends on a fair radius.

Controlled Radius Drawing Use

Controlled Radius is read with the adjacent dimension, note, or feature control frame so inspection uses the intended feature definition.

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0.04

This symbol defines or modifies a size, shape, or manufacturing dimension rather than creating a GD&T tolerance zone by itself.

Read the symbol with the attached dimension, note, or feature control frame before evaluating the feature.

Verify the controlled feature using the drawing's stated limits, datum setup, and any special notes tied to the symbol.

A drawing includes the Controlled Radius symbol with a related feature requirement.

Identify

Recognize the Controlled Radius symbol and the feature it modifies.

Read

Adjacent value

Use the attached dimension, note, or frame cells as the controlling requirement.

Inspect

Per drawing

Measure the named feature using the specified interpretation rather than assuming a generic size check.

Controlled Radius clarifies how the feature is defined so the drawing and inspection method stay aligned.

Item	Controls	Typical Placement
Controlled Radius	Dimension interpretation	Next to a dimension, note, or frame
GD&T control	Geometric variation	Feature control frame
Datum reference	Measurement setup	Datum feature or frame cell

This page is part of the drawing-symbol reference set rather than a standalone geometric tolerance category.

When the symbol modifies a feature control frame, read it together with the tolerance value and datum references.