Dimension Origin

Identifies the required origin surface or location from which a dimension must be measured.

ORIGIN

The dimension origin symbol replaces a normal arrowhead at the origin end of a dimension.

It fixes the measurement direction so the dimension must be taken from the specified origin surface.

Use it when measuring from the wrong side would change the functional interpretation.

Treat the marked surface as the origin for that dimension, similar to a local measurement reference.

Dimension Origin Drawing Use

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

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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 Dimension Origin symbol with a related feature requirement.

Identify

Recognize the Dimension Origin 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.

Dimension Origin clarifies how the feature is defined so the drawing and inspection method stay aligned.

Item	Controls	Typical Placement
Dimension Origin	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.