... dog spike,sharp-end spike and coach screw (rail fasteners)A: B:Elastic bar, lock washer, fishplate, rail support, steel sleeper, ... bolt, steel structure bolt, torshear type high strength plain washer, high strength bolt for bridge, stud, timber spike, hexagon ... Spring washer, flat washer, split pin4 Anti-loosen Fasteners Various nuts and bolts (Nylon anti-loosen, mechanical anti-loosen, screw anti ...