Circular runout (↗)
Circular runout (↗) limits how much each circular element of a surface varies as the part turns a full revolution about a datum axis. It needs a datum axis.
Easily confused with
How to read it
The symbol is a single arrow pointing up and to the right. A runout frame holds the symbol, the tolerance and at least one datum (Cogorno), and Keyence notes that runout cannot be specified without a datum. Cogorno defines circular runout as applying independently to each circular element of the surface, whether the element runs around the datum axis or square to it, as the part turns 360° about that axis. On a round surface, it controls a combination of circularity and coaxiality. The National Physical Laboratory’s guide notes the same independent check at each circular position, and that runout can be circular or axial, around a diameter or across a face.
Also searched as: ↗, circular runout gd&t, circular runout symbol, runout symbol.
This explains what a symbol specifies on a drawing. It isn't inspection or design guidance; the drawing and the edition of the standard it cites take precedence.
Look-alikes
Total runout ⌰ has two arrows joined at their tails by a base line, and applies to the whole surface at once instead of one circle at a time. Unicode has a drafting character for total runout, ⌰ (U+2330), but none for circular runout; the arrow used here is the general ↗ (U+2197) NORTH EAST ARROW.
Runout since 2018
NIST and UNC Charlotte’s seminar notes name runout, with Position (⌖), as what replaces Concentricity (◎) in ASME Y14.5-2018: runout for the surface’s “wobble”.
Read next
- Next in GD&T symbolsTotal runout (⌰)Total runout (⌰) limits the variation over a whole surface at once as the part turns about a datum axis, rather than one circle at a time.
- The same shape in Hand gesturesCheek screwAn index finger pressed into the cheek and twisted. In Italy it means something is good, beautiful or delicious; in southern Spain the same gesture is an insult that calls a man effeminate.
More GD&T symbols
The same shape elsewhere
Browse symbols drawn with arrows.
Sources
- Geometric Dimensioning and Tolerancing for Mechanical Design: Instructors’ Guide, Gene R. Cogorno, guide to the McGraw-Hill textbook, rev. 10/12/2020, Technical Training Consultants, Chapter 10, Runout, review answers
- Fundamental Good Practice in the Design and Interpretation of Engineering Drawings for Measurement Processes, Measurement Good Practice Guide No. 79, David Flack and Keith Bevan, 2005, National Physical Laboratory (UK), Chapter 4, Tolerances of run-out
- Run-out Tolerance (Run-out Deviation), GD&T Fundamentals, KEYENCE America, Circular Run-out
- Fundamentals of Geometric Dimensioning and Tolerancing (GD&T), Part II, Jaime Berez (UNC Charlotte) and Maxwell Praniewicz (NIST), seminar slides, National Institute of Standards and Technology, Slide 5
- Miscellaneous Technical, Range: 2300–23FF (code chart), The Unicode Standard, Unicode Consortium, Drafting symbols, U+2330
- Arrows: Range 2190–21FF (code chart), The Unicode Standard, Version 18.0, Unicode Consortium, U+2197
Researched, edited and approved by Rory Hansen before publishing. Last reviewed October 9, 2026. How we research
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