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A circled F applying a tolerance to an unrestrained part.
Also known as: Circled F modifier, Unrestrained condition marking
A circled F says a tolerance applies to the part as it lies, unrestrained. It exists for parts flexible enough to change shape under their own weight or under fixture pressure, where an inspection result depends on how the part was held.
Specifies that a tolerance applies to the part in its unrestrained condition rather than as clamped for inspection.
Contexts: Technical drawing
Exists for non-rigid parts whose measured geometry depends on how they are supported, such as thin sheet, seals and long slender components.
Contexts: Technical drawing
A capital letter F enclosed in a circle, set inside a rectangular tolerance frame after a value.