Metric standard sheetmetal workers, a question.

Factual Questions
1

Here in America we have our own arcane sheetmetal gage system. Did the metric system cause some standardization in Europe as far as sheetmetal gages?
I am interested in the system used in metric countries, specifically the thickness and tolerance allowed.
Any help?

2

Moved MPSIMS --> GQ.

3

Huh? American here, sheetmetal worker (welding, specifically). Our gages are all metric. Engineering (that’s me) coupled with purchasing dictates the tolerance for the gage limitation (depending on application), and engineering alone dictates the surface coating weight (for manufacturing feasibility). That doesn’t mean that we’re not pressured to evaluate different coating weight tolerances, though. (Hot-dipped sucks.)

4

European aerospace experience: all gauges I’ve seen are in 0.2’s of a mm. Common are 1.2, 1.6, 2.0 (at least in my applications - commercial aircraft). You can also get 1.5 and 2.5.

NB

5

Thanks for the info.
I have a Swiss sheetmetal part that measures close to 1.5mm. I was wondering how much can the thickness vary from the nominal 1.5.

6

I weld and Machine parts…
Engineers draw using Standard material, Purchasing buys what ever is cheap.

Try explaining to them that “One Inch” and “25mm” are NOT THE SAME THING. :mad:

Standard or Metric they are both Measured with the same Micrometer which is in Thousandths of an Inch.

Verniers on the other hand will do both Inches and Metric.

I find anything under .25 millimeters silly to read in millimeters.

I can feel a fit of .0005 In. But, reading that as .0000196875 mm is too cumbersome.
(not even sure that’s right) :rolleyes:

Oh that looks like 16 guage BTW…18 ga is like .055

7

Sorry, forgot to mention that in the aero industry we’re pretty much only talking about aluminum sheetmetal. Steel sheet is rare since we use aluminum to save weight…

For the spec that we use commonly for our customer (aluminum alloy 2024 clad sheet), the nominal thickness tolerances for 1.5mm sheet are:
width < 1000: th = +/- 0.07
1000 < width < 1250: th = +/- 0.08
1250 < width < 1600: th = +/- 0.12
1600 < width < 2000: th = +/- 0.16
NB