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

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

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

(OP)
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.

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

Gauge number?

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

Gauge number? (wire gauge)

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

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

Sheet metal thickness gauge.

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

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

Ben Loosli

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

(OP)
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.

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

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

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