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GD&T: Profile on BP shows a boundary line outward Ref ASME Y14.5 1994


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I could use a clarification of this profile. (See attached image).

I believe it means the profile should be outward as shown with the arrows, Unilateral (Nominal contour outside) and it is all around as shown.

I am quite sure that ASME Y14.5 1994 allows this while 2009 requires a "U" modifier.

Any assistance is appreciated.

Screenshot 2025-10-17 134958.jpg

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  • [Ri...] changed the title to GD&T: Profile on BP shows a boundary line outward Ref ASME Y14.5 1994

I think you found an answer from posted image from one of my posts. I don't know if it's valid with dashed line, but it looks like for newer ASME you would need (U).
Tolerance is shown on graphics, but without model i woud doubt if it's inward or outward ( if it's correct callout by engineer )

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I think theoretically there should be a single arrow to the phantom line, not two from basic to phantom, but other than that I would agree with all tolerance on the outside. And also "balloon number 1295" yikes - the highest I've had was 1594 and that a fun two weeks of programming 😜

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Try balloon numbers around 2,653 on this project, and that's what I am pulling from the part.

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