High-Strength Bolt&Nut for Track Shoe/Roller/Segment/Sprocket 1.Materials: low carbon alloy steel 20MnTiB 2.Property Class:8. Standard:GB/T 1228-1231,ISO7412,DIN6914-6916,ASME B 18.2.6 (ASTMA325,A490), JISB1186 AS1252Grade:8.8S, 10.9S , Size:M12-M36 Material:Carbon Steel,Alloy Steel 1> Description: High strength bolt, tension control bolt, T. C Bolt 2> Material: Alloy Steel 3> Surface: HDG 4> ...