It is becoming more and more
common to see prints with
ISO dimensional
requirements. ISO has in
place a system standards
that define tolerances and
surface finish requirements
of a machined surface.
ISO 286 defines the
dimensional tolerance and
deviations of machined
parts. There are a number
of defined tables that can
be used to call out or
control size. ISO 286
defines tolerances by means
of various charts including
E, F, G, H, J, JS, K, M, N,
P and R.
The most common call out for
honed or skived and roller
burnished tubing used for
hydraulic and pneumatic
cylinders are the H/h
tolerance tables. H
tolerances are plus the
tolerance minus 0. While h
tolerances are plus 0 minus
the tolerance.
Another important feature of
a machined part is the
surface texture. ISO has
standards developed to
control this feature. ISO
1302 uses N numbers to
designate the micro finish
of the surface.
A common print designation
for hydraulic cylinders
would be H8 with a N5
finish. This would
translate to the called out
dimension Plus the tolerance
minus 0 with a 16 micro inch
surface finish.
Commercial Fluid Power has
added a pdf file to our web
site that lists the diameter
from 3mm to 400mm and the
respective tolerances for
H/h tolerances in both
metric and imperial
designations. There is also
a chart that lists the
corresponding N values with
micro-inch and micro-meter
values included in this H/h
tolerance file.
Commercial Fluid Power H/h
tolerance and N Value Chart
Link.
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Stainless
Steel Overstock
Overstock items this
month.
2.125"OD x 1.781/1.784"
Honed ID x 24' Cuts in
304 SS
2.125"OD x 1.765 as
drawn ID x 24' Cuts in
304 SS
0.625/0.623" Chrome
Plated 303 Stainles
Steel
1.000/0.998" Chrome
Plated 303 Stailess
Steel
1.375/1.372" Chrome
Plated 303
StainlessSteel
Call: (414) 418-3629 for
price and availability
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