Location Pin Symbol

[kkg123]

Dear Friends

I am attaching a drawing, which has BLACK trangles in circle. some are 1/8 (SN 1 & 2), some are 1/4 ((SN 3 & 4), ), some 1/8 with a line in it ((SN 5 & 6). Any body can explain what is the meaning of this symbol. Is it location pin symbol?

Avinash Puri

 

[ak762]

My interpretation this symbol help to identify holes with same size as alternative to mark with letters

 

[CheckerHater]

Your drawing sais it: "Dowel pin".
Different marks identify different holes; not necessarily different diameter, but possibly different fit, and/or positional tolerance.
This technique is beneficial for large parts with hundreds of holes, but could be used elsewhere.
Some time ago it was standard practice, but I don't see it in modern books.
Could someone point out to relevant ASME or ISO standard?

 

[MechNorth]

I believe it was convention rather than a standard. Haven't seen it in ASME.

Jim Sykes, P.Eng, GDTP-S
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[fsincox]

I agree, it is suposed to make it easier to distingush which hole is which, as opposed to formally labeling "A" "B" etc....
Frank