True Position
A GD&T control defining the allowable location deviation of a feature as a diameter tolerance zone.
What it means on the floor
True position specifies where a feature (such as a hole) should be and how far its actual axis may deviate, using a cylindrical tolerance zone. The deviation is calculated from the X and Y offsets: position = 2 × √(ΔX² + ΔY²).
At maximum material condition, a bonus tolerance becomes available as the feature departs from MMC, allowing more positional error while still guaranteeing assembly.
Category: GD&T
Applying the term
Interpret True Position in the context of the drawing, governing standard, and customer requirement in front of you — the same word can carry different limits in design, quality, and production documents. Check whether a stated value is nominal, minimum, maximum, or reference-only, and whether it applies before forming, after forming, or after heat treatment.