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See Chinese contents: HG/T 20634-2009 HG/T 20634-2009: Bolting for use with steel pipe flanges (Class designated)
This Standard specifies style, dimension, material, mark, technical requirements and application provisions for boltings of steel pipe flange (Class designated). This Standard is applicable to boltings of steel pipe flange of HG/T 20615 and HG/T 20623, which include hexagon head bolting, isometric studs, full thread studs and nuts.
