Large hexagonal head bolt connection pair for steel structure
Executive standard：GB/1231-2006、EN14399-3,4:2005、ISO7412、DIN6914-6916、ASTMA325,A490
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Executive standard：GB/1231-2006、EN14399-3,4:2005、ISO7412、DIN6914-6916、ASTMA325,A490
Available materials：20MnTiB、35VB、40Cr、35CrMoA、TYP1、TYP3
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