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See Chinese contents: GB/T 801-2021 GB/T 801-2021: Cup head square neck bolts with small head and short neck -- Product grade B
This document specifies the type, size, technical conditions and marking of cup head square neck bolts with small head and short neck. This document is applicable to cup head square neck bolts with small head and short neck with thread specifications of M6 ~ M20, performance grades of 4.8, 8.8, 10.9, A2-70, A4-70, A2-50, A4-50 and product grade of B.
