GB57825783 high-strength grade 8.810.912.9 boltshigh-strength large hexagonal head bolt connection pairstorsion-shear high-strength bolt connection pairs for steel structuresGB6170GB6175 high-strength nutsGerman standard DINAmerican standard ASNE\ANSIBBritish standard BSWphotovoltaic auxiliary material seriesexpansion bolt seriesand various customized special-shaped parts.
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