... customers drawings and samples . Raw material : Q235 . Surface : plain (oil) Shanghai SUYU Railway Material Co., Ltd.,one professional manufacture of ... Fastening SystemType: SKL1, SKL3, SKL12, SKL14Raw Material: 38Si7, 60Si2CrASurface: Plain (oil), black paint, colour paint, zinc, dacromet, hdg, etc. 3. ... Material: Q235, 35K, 45#, 40Mn2, 20Mnsi, 35CrMo, 40Cr, 42CrMo...Grade: 4.6, 4.8, 5.6, 8.8, 10.9 ...