The standard is an older Chinese national standard for O-rings, widely utilized in mechanical engineering, hydraulic systems, and pneumatic equipment . While it has largely been superseded by newer standards like GB/T 3452.1 , many legacy machines and specialized industrial parts continue to use it for identification. Understanding the GB 1235-76 Standard
The (or GB 1235-1976 ) standard is a legacy Chinese technical specification for rubber O-rings used in hydraulic and pneumatic sealing. Although technically superseded by newer standards like GB/T 3452.1, it remains a critical reference for maintaining older machinery, particularly forklifts and heavy industrial equipment. Overview of the GB 1235-76 Standard gb1235-76 pdf
The original 1976 document also specifies: The standard is an older Chinese national standard
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