The circle that is pointed at by the arrow (leader) should lie between two Ideal circles that are concentric with each other, and the distance between these two circles is the value of the tolerance.Įxample of a drawing entry: The tolerancezone of this example would look like this: The surface that is pointed at by the arrow (leader) should lie between two Ideal planes that are parallel to each other, and the distance between these two planes is the value of the tolerance. The tolerancezone of this example would look like this:

The line that is pointed at by the arrow (leader) should lie between two Ideal lines that are parallel to each other, and the distance between these two planes is the value of the tolerance. GD&T in 5 minutes List of GD&T symbols Form tolerances In the following sections we will look into in more detail. GD&T is widely used in the manufacturing industry to ensure that parts and assemblies meet precise specifications.

GD&T (Geometric Dimensioning and Tolerancing) is a system of tolerating parts and assemblies on engineering technical drawings to communicate geometric requirements.

Gdt flatness symbol