... ,BS,or by client 2size:5/8"*12" 3grade:4.6,5.6,8.8,10.9 4Certificate:SGS Rail Timber ... according to customers'requirements and drawings. >> thread: 16---36,5/8"--1-3/4" >> length: 60---500 >> Shape of head ... : Hexagon head >> Grade: 4.6,4.8,5.6,5.8,6.8,8.8,10.9,12.9 ( General and High ... .From 2006, we have manufactured the products of high speed railway and now they are being used. We exported ...