Hex Callout - How to Interpret? 1

[InvoluteSpline]

Hi All,

A seemingly simple dilemma, but I was not able to find a firm answer. Is the "HEX" callout in the attached drawing to be interpreted as flat-to-flat or point-to-point? I cannot seem to find a solid reference on how to interpret this. Nothing in ASME Y14.5 from what I could tell. The drawing specifies "HEX" but it only shows a side view. I'm assuming .50" from flat-to-flat.

Thank you in advance.

 

[3DDave]

It is indeterminate. At the least, if the part is made with .50 across flats and that is wrong, the part can be reworked to .50 across corners. That said, I don't have any idea why anyone would dimension across corners. Confounding is that the section appears to be across corners.

 

[juergenwt]

99.999% across flats 1/2" Hex You just don't specify a hes across points.

 

[pylfrm]

InvoluteSpline,

The ASME Y14.5-2009 "square symbol" is used with the dimension across flats, so it's probably a reasonable extension of principle that "HEX" would be used the same way.

What sort of drawing did you find this in?


pylfrm

 

[tbuelna]

Always good practice to provide sufficient views/dimensions/notes/etc on your engineering documents so that no interpretation is required. Usually doesn't require much additional effort.

In the example shown, even if you assume the hex dimension is .50 across the flats, there is nothing specifying what the flange profile is between the local hex flats. Are the hex corners sharp, rounded, or some other profile?

 

[InvoluteSpline]

Thank you everyone for the replies.

pylfrm - Not much else was provided with the attached picture other than some basic notes and a rudimentary title block, so I cannot say.