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See Chinese contents: GB/T 18230.6-2000 GB/T 18230.6-2000: Hexagon nuts for structural bolting, style 1, hot-dip galvanized (oversize tapped) - Product grades A and B - Property classes 5, 6 and 8
This Standard specifies the hexagon nuts for structural bolting - thread specification of M10 ~ M36, style 1, hot-dip galvanized according to GB/T 13912 or sherardized according to GB/T 5067, oversize tapped according to 6AX, property classes of 5, 6 and 8, product grade of A used for dM16. If other technical requirements are required, it shall be selected from current standards (such as GB/T 196, GB/T 197, GB/T 3098.2, and GB/T 3103.1).
