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ISO 7168, DIN ISO 7168 - F, M, G, SG Tolerances
ISO 7168 - 2 comes
from DIN ISO 7168 - 1, which is a general dimensional tolerance
standard. This standard mainly divided the tolerances as four
degrees as f, m, g and sg. Although it is a little coarse, but it
can be applicable for most of dimensional tolerance for iron, steel
and aluminum castings. Normally this standard is applicable for
indicating the unspecified tolerances of machining dimensions.
1. "F" degree means "fine", so it is the highest tolerance degree
for the dimensions. So, the manufacturers should take more care to
these dimensions, normally, the CNC centers and numerically
controlled machining tools will be necessary.
2. "M" degree means
"medium", so it is lower than "F" degree. Normal controlled
machining tools can meet the tolerance requirements. But
rough castings
or rough machining will not reach this level.
3. "G" degree means
"coarse", which is from German word "grob". Rough machining can meet
the requirements, and moreover, some rough castings made by some
precision casting processes can also meet the tolerance, such as die
casting and vacuum investment casting.
4. "SG" degree
means "very coarse", which is from German word " sehr grob". This is
most coarse degree in this standard, so most rough machining can
meet the requirements, but only some precision castings can reach
this level, it is still too strict for most of sand casting process.
As for the specific permissible deviations for linear dimensions,
external radii and chamfer heights, please refer our article
DIN 7168.
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