... for Track Shoe/Roller/Segment/Sprocket 1.Materials: low carbon alloy steel 20MnTiB 2.Property Class:8. Standard:GB/T 1228-1231 ... bolts, screws, nuts, threaded rod, anchor bolt, nail, other off-standard fasteners and following to the drawers of products, which are ... and nut5-Surface dealing : Black, Grey(phosphated, Parkerising)6- Thread standard : Thread length tolerance according to GB/T 3103.1-2002 ...