GD&T Symbol Guide
Slope
Defines a flat taper as the ratio of height change to length change.
Definition
The slope modifying symbol indicates the value is controlled as slope rather than an angle dimension.
The value represents height change over length change.
Application
Use it for wedges, ramps, drafted flats, and flat tapered surfaces.
The vertical leg of the symbol is shown on the left regardless of the direction of the slope.
Slope Drawing Use
Slope 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: Slope
A drawing includes the Slope symbol with a related feature requirement.
Identify
⌳
Recognize the Slope 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.
Slope clarifies how the feature is defined so the drawing and inspection method stay aligned.
Comparison Table
| Item | Controls | Typical Placement |
|---|---|---|
| Slope | 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.