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GD&T Symbol - Cylindricity (1994 & 2009)

See Cylindricity (2018)

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Y14.5M-1994 [6.4.3], Y14.5-2009 [5.4.3]

GD&T Symbol - Cylindricity

The cylindricity tolerance can be used with cylindrical features only.

GD&T Symbol - Cylindricity

The tolerance will be on a leader line which points to the cylindrical feature.

GD&T Symbol - Cylindricity

Cylindricity is also very difficult to measure without the aid of a computer. Both circularity and cylindricity require sweeping the surface to get many points which are usually evaluated by a computer program.

GD&T Symbol - Cylindricity

Cylindricity controls a cylindrical feature better than the control provided by:

  • a size tolerance
  • total runout
  • profile of a surface