I used the one 7th from the top. But my co-worker said it's the 2nd one from the top.
It's the second one. But you're not hurting anybody with your choice. Stick with it if you like it.
Second from the top.
Where in the ASME I can refer this to?
I can't find it in words in ASME, but the above figure is from the Genium drafting manual, which is one of two or three pretty authoritative interpretations of ASME. Aside from that, you can open up ASME Y14.5M 1994 to any random page, and you will see the second arrow type.
I would think you would want to know if your using ANSI or ISO. the arrow head for ANSI is solid and for ISO is not. ASME does not give a specification for this only ANSI and ISO or whatever other standard you use. ASME Y14.2 Gives the drawing standards for sizes for the arrows and such. Hope this helps.
P.S. These are also called dimension line terminators. FYI
I don't know much about ISO, so that is interesting. But ANSI==ASME. There is no distinction.
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