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See Chinese contents: GB/T 4346-2008 GB/T 4346-2008: Machine tools -- Manually operated self-centering chucks
This standard specifies the type and parameters, technical requirements, test methods, inspection rules, marking, and packaging of manually operated self-centring chucks (hereinafter referred to as chucks). This standard is applicable to scroll three-jaw chucks, and it also can be used as a reference for other scroll chucks.
