GB standard hex bolt includes two standards,Website:http://www.chinajinrui.net,GB5782 and GB5783.GB5782 apply to half thread GB standard hex bolt,GB5783 refers to full thread hex bolt.All the GB hex bolt grade can be 4.8、5.8、6.8、8.8、10.9 and 12.9etc.Both of them covering the dimension from the M1.6 to M64.         The application of the GB hexagon bolt is mainly in the field of structural steel,metal buliding,oil