High-Strength Bolt&Nut for Track Shoe/Roller/Segment/Sprocket 1.Materials: low carbon alloy steel 20MnTiB 2. ... , Elastic rail clips2, Dog spikes, square head screw spikes, timber drive spikes, T-bolts, fish bolts, switch & crossing bolts, high tensile ... ship building industry High-Strength Bolt&Nut for Track Shoe/Roller/Segment/Sprocket