GD&T Symbol Guide
Conical Taper
Defines a taper as the ratio of diameter change to length change.
Definition
The conical taper symbol indicates the listed value is a standard taper ratio.
The value represents diameter change over length change.
Application
Use it for cones, tapered shafts, tapered bores, and standard taper series.
The symbol is shown with the vertical leg on the left regardless of the taper direction on the drawing.
Conical Taper Drawing Use
Conical Taper is read with the adjacent dimension, note, or feature control frame so inspection uses the intended feature definition.
3D Tolerance Zone
This symbol defines or modifies a size, shape, or manufacturing dimension rather than creating a GD&T tolerance zone by itself.
Inspection Method
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.
Worked Read: Conical Taper
A drawing includes the Conical Taper symbol with a related feature requirement.
Identify
⌲
Recognize the Conical Taper 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.
Conical Taper clarifies how the feature is defined so the drawing and inspection method stay aligned.
Comparison Table
| Item | Controls | Typical Placement |
|---|---|---|
| Conical Taper | 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 |
Notes
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.