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See Chinese contents: QC/T 870-2022 QC/T 870-2022: Double end studs bm=1.25d
This document specifies the type, size, technical conditions of double end studs bm = 1.25d. This document is applicable to double end studs for automobiles, whose thread at the screw-in base end is ordinary coarse thread, transition fit thread, ordinary fine thread (thread specification is greater than M16), AND the thread at the screw-in nut end is ordinary coarse thread and ordinary fine thread.
