This part of Standard GB/T 3452 specifies the inside diameters, cross-sections, tolerances and size identification code of O-shape rubber rings (O-rings for short) used in liquid power systems. The publication applies to general-purpose (Series G), aviation and similar applications (Series A).
The dimensions and tolerances defined in this part of Standard may apply to any synthetic rubber materials, provided suitable manufacturing processes are available.
Note: The manufacturing generally used is based on contraction percentage 70 IRHD NBR. For materials that have a different contraction percentage from NBR synthetic specified in the standard, special moulds may be required so as to maintain the nominal dimensions and tolerance limits.
