Bolt&Nut for Track Shoe Class: 10.9, 12.9 grade CE certifation Hardness: HRC36-42 Standard:GB ... Steel,Alloy SteelTrack Bolt&Nut1.high strength track shoe bolt 2.Heat flush bolt3.40Cr Bolt4.excavator ... and bulldozer track shoe bolt.We supply various dimension track shoe bolt ,which are used for ... head bolt: Treatment: HDG, Zinc, Black... Carbon steel: Grade/class 4.8, 5.8, 8.8, 10.9, ...