High-Strength Bolt&Nut for Track Shoe/Roller/Segment/Sprocket 1.Materials: low carbon alloy steel 20MnTiB 2. ... .5, Standard fasteners.6, Nuts, flat washers and spring washers, plastic pads, nylon insulator, bushing etc.Stainless Steel Hex bolts nuts ... ship building industry High-Strength Bolt&Nut for Track Shoe/Roller/Segment/Sprocket