GD&T ETS5

Geometry, dimension and tolerance

Geometric dimensioning and tolerancing

Geometric dimensional and tolerancing

Geometry, dimensioning and tolerancing

Computers are used in design and manufacture

Risk of a part being made

Part features are critical to function

Parts such as washers and nuts

1

2

3

4

Perpendicular to the primary datum feature

The part must contact this plane at least at one point

Must be at a 90° angle to the primary datum plane

May not be applied to center lines, center planes or axes

3

4

5

7

a part's most critical features

best assembly scenario

engineering design specifications

how to prevent assembly errors

less waste

cost savings

efficient designs

fewer arguments