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See Chinese contents: QC/T 599-2022 QC/T 599-2022: Overhead projection weld bolts
This document specifies the types, dimensions, and technical conditions of overhead projection weld bolts. This document is applicable to the type A overhead projection weld bolts and type B overhead projection weld bolts for automobiles, which have a thread specification of M4 ~ M12/M12 x 1.25.
