... quality, low price Steel bolts demand side Steel-structured high-strength torsion components for bolted connections with CE certifation 1.high ... shoe bolt.We supply various dimension track shoe bolt ,which are used for caterpillar, komatsu, hitachi, kobelco, daewoo, kato, hyundai, samsung, ... HRC:34-38,38-42,only for bolt3-Surface hardness:HRC:29-33 only for nut4- There shall be no crack and harmful ...