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See Chinese contents: GB/T 23921-2023 GB/T 23921-2023: Tri-wheel vehicles -- Axle shaft
This document specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation, and storage of tri-wheel vehicle axle shafts (hereinafter referred to as axle shafts). This document is applicable to the design, manufacture, and product quality inspection of axle shafts for tri-wheel vehicles.
