Topy Industries Ltd is a Japanese producer of steel and automotive and industrial machinery components. Topy's largest segment by revenue, automotive and industrial machinery components, produces steel and aluminum wheels for passenger cars, commercial trucks, and buses; ultra-large-diameter wheels for mining dump trucks; industrial spring steel fasteners; and undercarriage components such as track shoes, cutting edges, links, and rollers. In its second- largest segment, the company produces general steel sections, deformed and flat bars, mast rail sections for forklifts, and universal mill plates.