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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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Page 1 of 1ISO 7168, DIN ISO 7168 - F, M, G, SG Tolerances
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