Surface Finish - G5 - Where is this from and how can I measure it?

[Geoff Cotton]

Folks,

Long time no speak - hope you are all well.

I've just been asked a question from our office in Norway via our office in Denmark, so the question may have got distorted.

Anyone ever come across a surface treatment known as "G5" ?

[Wes Bucey]

Originally Posted by Geoff Cotton

Folks,

Long time no speak - hope you are all well.

I've just been asked a question from our office in Norway via our office in Denmark, so the question may have got distorted.

Anyone ever come across a surface treatment known as "G5" ?

What product or material?
I have heard of G5 (Grade 5) applied to indicate precision of dimension and surface finish of steel balls (bearings?) I have no idea if that translates to some Standard from AISI or ASTM.

[Geoff Cotton]

My first thought was also a measure of surface roughness.

We "think" it is being used to describe a surface finish being applied to industrial fasteners. I've never come across it though.

[Wes Bucey]

Originally Posted by Geoff Cotton

My first thought was also a measure of surface roughness.

We "think" it is being used to describe a surface finish being applied to industrial fasteners. I've never come across it though.

This idea is out in La La Land - COLOR is sometimes described on a 1-10 scale for Red Blue Green - could they be talking about anodized color for fasteners?

[Sam]

Is it definitly a surface treatment or could it mean "grade 5 fastener"?

[Wes Bucey]

Originally Posted by Sam

Is it definitly a surface treatment or could it mean "grade 5 fastener"?

Yes! Yes! Sam is closing in on the right questions!
What is the context of "G5"? Is it a note on an engineering drawing? A comment on a purchase order? A stray remark from someone at a customer who is confused with some sort of "gem rating"?

If G5 comes from the customer in ANY way, there is no shame in simply ASKING for an explanation. We had some confusing thing from a customer that had us in a tizzy for two days until we called the customer - turned out it was a foreign language term one of their outsourced draftsmen had used and they had been copying it for months on dozens of documents with no clue what it meant either. Turned out to mean "non-gloss finish" - I forget what the foreign term was.

[Al Rosen]

G5-94(2004) Standard Reference Test Method for Making Potentiostatic and Potentiodynamic Anodic Polarization Measurements