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A circled P extending a tolerance zone beyond the part.
Also known as: Circled P modifier, Projected zone marking
A circled P projects a positional tolerance zone out of the part and into the space a fastener will occupy. It controls where a stud will point rather than where the hole sits, which is the difference between a threaded hole that assembles and one that does not.
Projects a positional tolerance zone outside the feature into the region a fitted fastener will occupy.
Contexts: Technical drawing
Controls the attitude of an assembled fastener rather than the location of the hole, which is what matters when a stud must clear a mating part.
Contexts: Technical drawing
A capital letter P enclosed in a circle, followed by a numeral, set inside a rectangular tolerance frame.