... 270 3Surface:Black,Zinc,Dacro 4Certificate:ISO9 Different types of grade 8.8 bolt specification Details of the product:1Materials: 1045, 45#, 40Cr ... System and got the Production Permission License from the Ministry of Railways, P.R.China. 2.From 2006, we have ... . Factory view figures: PackagingFactory viewTesting equipmentsWorkshop Welcome your visit! Different types of grade 8.8 bolt specification