Track Bolt and Nut Class: 10.9, 12.9 grade CE certifation Hardness: HRC36-42 Standard ... Co., Ltd are supplying all kinds of high quality products such as bolts, high strength bolts, ... (Germany), GB (China), UNI, JIS (Japan), ISO and TCVN (Vietnam).1.Application:railways, highways, bridges, plants,etc ... & South Africa etc. Product name: Track bolt and nut Model: As per machine Material: 40Cr Processing: ...