... Railway FastenersA: Railway bolt, square head screw spike, T type bolt, 70 rail spike, spiral spike, dog spike, turnout ... Standard componentsA: Hex bolt, square bolt, steel structure bolt, torshear type high strength plain washer, high strength bolt for bridge, stud ... flat washer, split pin4 Anti-loosen Fasteners Various nuts and bolts (Nylon anti-loosen, mechanical anti-loosen, screw anti-loosen ...