1. Grade: 4.6,4.8,5.6,8.8,10.9,12.9 2. Raw Material:Q235,35#,45#,40Mn2,20Mnsi 3. Finish:Plain, Black, Zinc, HDG Jinstar Railway Material Co.,Ltd is one of the leading manufacturers of railway material and railway fasteners. We have the largest railway fastener factory in China. Our products have been exported worldwide, We have granted ISO9001-2008 certificates. We can produce according to ...