Carbon Steel Tubing Tolerances
At Welded Tubes, our standards for tolerances are
tighter than ASTM A513 specifications.
American Society for Testing and Materials (ASTM)
International is one of the largest voluntary standards development
organizations in the world-a trusted source for technical standards
for materials, products, systems, and services. Known for their high
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 Download our tubing sizing and
tolerance chart. (PDF, 23KB)
Three constraints affect the cross-sectional
dimensions of welded tube:
-
Outside diameter (OD)
-
Gauge (wall thickness)
-
Inside diameter (ID)
An as-welded tube manufacturer can control the OD
and gauge of the tube. Since the tube is manufactured from the
outside by a series of rolls that ultimately produces the final OD
size of the tube, the ID varies by the combination of the final OD
and gauge. Tight tolerance tubing reduces ID variation compared to
that of conventional tubing produced to American Society for Testing
& Materials (ASTM) standard 513. For fabricators, this reduction
helps to provide improved quality, reduced scrap, and the possible
elimination of processing steps.
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