ISO 3601 consolidates the long established AS 568B inch standard with the existing metric ISO 3601 and importantly, as it retains its original designation, means modification of documentation may not be required.
Until the harmonisation between the AS and ISO standards, it was not possible to specify housing dimensions and retaining rings.
Now two parts have been added to the standard that define these, while still in revision is a section on elastomer materials.
Class A corresponds to the American standard AS 568B in its current format. Class B allows production of O-Rings in technically acceptable and economical metric sizes and inch sizes, which can then fit into metric grooves.
Also, in Class B, the five standard cross sections are replaced with a table of tolerances using a formula.
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