pROcESSINg tEchNOlOgy 41
documentation need not be changed, unless they include ISO 3601-4: 2008: New - Retaining ring specifications:
the standard’s date.” u Covers spiral Back-up Rings, solid type (cut/uncut),
The five parts of the now valid O-Ring standard ISO concave type (cut/uncut).
3601 are as follows: u Gives tolerances for outer and inner diameters
ISO 3601-1: 2008. Revised - Inside diameters,
depending on rod or piston applications.
cross-sections, tolerances and designation codes:
u Design recommendations but no size list for preferred
u Dimensions are expressed in both metric and inch
housing dimensions.
measurements.
u Class A is identical with AS568B.
ISO 3601-5:2002. Currently in revision – Suitability of
u Class B is similar to the tolerances of the previous ISO
elastomeric materials for industrial applications:
3601-1: 2002 and includes an equation to calculate
u Will replace general information on material groups
the tolerance for the O-Ring inside diameter.
with detailed information of more practical use to
u Range for O-Ring cross-section diameter tolerances
design engineers
from 0.8 mm to 8.4 mm ISO 3601-2: 2008
u Will comprise detailed material specifications for
important material groups
New - Housing dimensions for general applications:
u Covers technology for measuring surface roughness of
Trelleborg Sealing Solutions has a high level of
O-Ring housings.
expertise in specification of O-Rings and other sealing
u Design recommendations for O-Ring squeeze,
elements within a wide range of industrial, aerospace and
elongation and compression as well as maximum
automotive applications.
groove fill.
Design engineers can contact one of more than 40
u Equation for calculation of O-Ring cross-section
marketing companies worldwide for further information
reduction caused by the elongation of the O-Ring inner
on this O-Ring standard or selecting the optimum sealing
diameter.
element for their specific application. u
ISO 3601-3: 2005. Partially revised - Quality
acceptance criteria for O-Ring surfaces. For more information, visit www.tss.trelleborg.com
circle 41 or ✔ at www.scientistlive.com/elab
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eLab june 09.indd 1 07/05/2009 08:44:11
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