high tension bolt: 1Materials:1045/5140/35Cr-Mo 2Surface: Black, ZP, HDG ... .8,10.9,12.9 Railway fastener torshear high tension bolt 10.9 >> We manufacture ASTM E1852 & GB/T ... /C,T/T >> Apply to railway, highway, bridge, boiler with steel structure,industry workshop,high civil buildings, hoisting machinery and ... on. THE SAMPLE OF THIS KIND OF HIGH STRENGTH BOLT, GB/T 3632 Our strength on exporting:1.Our ...