This standard specifies the size series and tolerances of O-shaped rubber sealing rings (hereinafter referred to as O-rings). This standard applies to the dimensions and tolerances of general and aerospace O-rings for hydraulic and pneumatic systems and components.
GB 3452.1-1992 history
2005GB/T 3452.1-2005 Fluid power systems-O-rings-Part 1:Inside diameters,cross-sections,tolerances and size identification code