NGK Spark Plugs Explores Manufacturing Excellence at Nitto WKS

Behind the roar of engines lies a small but critical component: the spark plug. This tiny device is the lifeblood of the automotive industry, and NGK, a global leader in spark plug manufacturing, relies on a lesser-known powerhouse—WKS (Wittis Park Tech WKS)—to maintain its dominance. Formed in April 2021 through the merger of Nippon Soken’s spark plug division and Wittis Park Tech Tono, WKS specializes in producing spark plugs, glow plugs, and their components, serving as the backbone of NGK’s global market share.

Spark plugs are essential for igniting the air-fuel mixture in internal combustion engines. Without them, engines would fail to start, and modern automotive technology would be impossible. Beyond ignition, spark plugs directly influence fuel efficiency, making their performance crucial in an era focused on energy conservation and environmental sustainability.

NGK spark plugs are renowned worldwide for their reliability and are used extensively in both automobiles and motorcycles. WKS plays a pivotal role in maintaining NGK’s industry-leading position through its advanced manufacturing capabilities.

WKS operates seven factories across Japan, located in Nagoya, Komaki (Aichi Prefecture), Kani (Gifu Prefecture), and Satsuma (Kagoshima Prefecture). This robust production network ensures a steady supply of high-quality spark plugs and glow plugs, meeting the demands of major automotive manufacturers globally.

WKS actively recruits skilled professionals to join its mission of advancing cutting-edge manufacturing. As part of the Nippon Soken Group—listed on the Tokyo Stock Exchange—WKS offers competitive benefits and a stable work environment. Employees are encouraged to engage in high-precision manufacturing processes, fostering both personal growth and corporate success.

WKS employs meticulous production techniques to ensure NGK spark plugs meet the highest standards. Below is an overview of the key manufacturing stages:

• Powder Formation and Molding: Raw alumina is crushed and pressed into shape, forming the foundation for ceramic insulators.
• Firing and Glazing: Molded components are fired at high temperatures, then printed and coated with glaze to enhance insulation and durability.
• Metal Stamping: Steel sheets are precision-cut and stamped into structural components, with material strength directly affecting performance.
• Welding and Threading: Electrodes are welded to metal parts, followed by threading to ensure secure installation.
• Electroplating: Metal components undergo electroplating to resist corrosion, extending product lifespan.
• Final Assembly: All parts are assembled, bent, and joined to complete the spark plug, with precision determining overall quality.

Additional quality control measures and specialized processes further guarantee NGK’s reputation for excellence.

From a strategic perspective, WKS’s achievements stem from:

• Corporate Backing: Strong support from Nippon Soken enables continuous R&D and technological upgrades.
• Uncompromising Quality: Rigorous oversight at every production stage ensures world-class output.
• Global Demand: WKS products are integral to vehicles worldwide, securing a stable market.
• Skilled Workforce: Investment in talent cultivates expertise and innovation.

Through its technical prowess and commitment to advancement, WKS remains indispensable to NGK’s global leadership in spark plug manufacturing.