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unc, unf, bsw, bsf, unef, coarse thread, fine thread，class8.8 ,class10.9，class 12.9 ,grade5 ,grade8 ,grade9 ， grade 8.8 ,grade10.9, grade 12.9

unc, unf, bsw, bsf, unef, coarse thread, fine thread，class8.8 ,class10.9，class 12.9 ,grade5 ,grade8 ,grade9 ， grade 8.8 ,grade10.9, grade 12.9

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