nut bolt: 1Spec:DIN,JIS,ASTM,GB,UIC 2Surface:black 3Grade:8.8,10. ... . Item:High strength bolts for steel structuresII. Specification: DIN 6914, DIN 6916, DIN 7990, DIN 7999, DIN 931, ISO 7412, ISO 4775, ISO 7416, JIS B ... Permission License from the Ministry of Railways, P.R.China. 2.From 2006, we have manufactured the products of high speed ...