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See Chinese contents: GB/T 33156-2016 GB/T 33156-2016: Precision welded tubes for gas spring
This Standard specifies the classification, code, size, shape, weight and allowable deviation, technical requirement, inspection and test method, inspection rule, packaging, marking and quality certificate of precision welded tubes for gas spring. This Standard applies to cold-drawn or cold-rolled precision welded tubes for gas spring (including seat air pressure bars and lifters) in machinery manufacturing, vehicle manufacturing, and furniture products.
