The "76" in GB 1235-76 signifies its establishment in 1976. It defines the dimensions, tolerances, and identification codes for O-rings, specifically focusing on their use as circular mechanical gaskets.
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 Although technically superseded by newer standards like GB/T 3452.1, it remains a critical reference for maintaining older machinery, particularly forklifts and heavy industrial equipment.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
If you are repairing a machine, look at a gb1235-76 pdf and assume you can buy standard metric O-rings from McMaster-Carr or RS Components. The "76" in GB 1235-76 signifies its establishment in 1976
GB1235-76 is a Chinese National Standard (Guobiao, or "GB") originally issued in 1976. The full title translates to or, more broadly in industry, it is the defining standard for O-ring groove dimensions and housing designs . Although technically superseded by newer standards like GB/T
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