ISO Tolerances
ISO Tolerances
(OP)
Hi,
I got a print that has the following tolerances listed and i am having trouble finding what the actual +/- tolerances are? It's all metric.
ISO 2768-mk
ISO 13920-BF
ISO 1101
Example of one is: Dia 41H8(2X)
Thanks!
I got a print that has the following tolerances listed and i am having trouble finding what the actual +/- tolerances are? It's all metric.
ISO 2768-mk
ISO 13920-BF
ISO 1101
Example of one is: Dia 41H8(2X)
Thanks!





RE: ISO Tolerances
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: ISO Tolerances
RE: ISO Tolerances
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: ISO Tolerances
This might be a better question for the Drafting Standards, GD&T & Tolerance Analysis forum.
Your Machinery's Handbook has enough information to make sense out of ISO tolerances. Your hole, Ø41H8(2X) translates to Ø41.039/41, and there are two features to be fabricated this way.
The H8 tolerance is recommended as part of a clearance fit, to be mated with an f7 toleranced shaft. Under ANSI B4.1-1967, this is classified as an RC4 fit. The H8 tolerance is called on some of the other ANSI fits.
RE: ISO Tolerances
'm' (Medium) relates to the class for part 1, 'k' relates to the class for part 2.
You will have to get a copy of the standard, you can find portions of part 1 free on the net, possibly under DIN 2768, but you'll have trouble finding the whole thing for free, and arguably shouldn't expect to.
It's a bit of a Dog from the standard US/UK practice point of view but the Germans use it so it must be good right?
ISO 13920 I believe does similar for welded parts but I'm not sure.
ISO 1101 is a geometric tolerances spec, perhaps comparable to part of what 14.5 covers in the US.
H8 is to do with 'standard' shaft/hole fits as drawoh says, ISO 286 should explain this, again portions are available on the net.
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?
RE: ISO Tolerances
jawohl ! (click)
RE: ISO Tolerances
Jawohl, Reichsmarshall!" (click)
Otherwise, it just doesn't seem to have the same impact, at least, to me...
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
RE: ISO Tolerances
From the Simpsons show.