GA. NO. and GA. notes in dimensions on drawings for mfg.

[jfcoest]

Hi,
I have a drawing with some dimensions that includes the note GA. NO. or sonly GA.

what is the meaning of that notes?
thanks.

 

[dgallup]

Gauge number?

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[Belanger]

Gauge number? (wire gauge)

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

 

[looslib]

Sheet metal thickness gauge.

Gauge is used a lot in the metal industry as a thickness measurement.


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[KENAT]

Per ASMe Y14.38 GA can mean...

Gage
Gas Amplification
Glide Angle
Graphic Ammeter
Ground-to-Air

NO can mean Normally Open or number.

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(probably not aimed specifically at you)
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[jfcoest]

Thanks,

the drawing that I am talking about is for machining a body of butterfly valve, where diameter dimensions are following by the note GA. NO.

example (dia. 4.879 / 4.876 GA. NO.)

thanks again.

 

[looslib]

In your case that would be a gage dimension.
Usually used on a tapered surface, you would have a gage diameter and a gage height.
Measure the diameter at that height and it needs to meet the gage diameter values.


"Wildfires are dangerous, hard to control, and economically catastrophic."

Ben Loosli