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See Chinese contents: JB/T 6688-1993 JB/T 6688-1993: Specification for 12-spline Flange Nut and 12 point Flange Nut
This Standard applies to the manufacture and acceptance of 12-spline flange nut and 12 point flange nut (hereinafter referred to as bolt and nut respectively) that are used for gas turbine power plant.
