What does this symbol mean on a print? Surface finish?

[Lazyman]

I this a surface symbol in the attached pic a 8 RA (micro inch finish) or something else entirely? I'm just confused because of the upside down 8 and looks different than what I normally see? The print default units are in inches with a 63 RA finish I always see.

Thanks in advance.

 

[specfab]

Yes, that's my interpretation.

 

[SRuss]

Definitely an 8 finish. I noticed the 8 was upside down, too. Maybe some weird software glitch?

 

[Lazyman]

Thanks that's what I thought too. I will confirm with the customer, I just wanted to check first in case it was something else I didn't know about first to avoid making myself look like and idiot.

 

[mhajicek]

It's an infinity symbol. They're calling for an infinitely smooth surface.




/s

 

[winger]

just oriented in line with the surface it call out.

Dave

 

[couch]

This is a good reference for surface finish symbols.

Understanding Surface Roughness Symbols | Introduction To Roughness | KEYENCE America

 

[Jimatapogee]

Yup, it's an 8 finish for sure.

 

[Jimatapogee]

Ha! Now if I could only find that spool of half thirteen thread.....