Location Pin Symbol? 2

[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

 

[cloa]

Better to ask the GD&T forum.

 

[juergenwt]

I can not see the whole print, but it looks like they just used those triangles to mark the holes having the same dim..That is why one "note" is sufficient.

 

[MintJulep]

Some people do that just to ID holes that are the same.

I don't think it is "legal" to any standard.

 

[Cockroach]

They are called "part reference zero" or PRZ. I use them to tell the machinist my reference tandem for that view. They're used as a particular view origin and dimensional reference. It 's for machining purposes.

Regards,
Cockroach