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See Chinese contents: GB/T 31879-2015 GB/T 31879-2015: Road vehicles -- General technical requirements for fifth wheel
This Standard specifies the model, technical requirements, test methods, inspection rules, mark, transportation and storage of the fifth wheel, as well as the accompanying document of the product. This Standard is applicable to the 50# and 90# fifth wheels connected with the traction pin specified in GB/T 4606 and GB/T 4607.
