NGK Spark Plugs Co., Ltd. (日本特殊陶業株式会社 Nippon Tokushu Tōgyō Kabushiki-gaisha) is a public company established in 1936 and based in Nagoya, Japan. NGK manufactures and sells spark plugs and related products for internal combustion engines, along with ceramics and applicable products.
As of March 2007, the company employed 10,407 people, and operated a network of 7 liaison offices, 12 sales offices, 13 production sites and 2 technical centers worldwide. NGK Spark Plugs was founded as a spin-off of the spark plug division of NGK Insulators. Originally, NGK supplied most of its products to Japanese automakers. Today the company is the largest OEM sparkplug maker in the world.
NGK stands for Nippon (Japan) Gaishi (insulator) Kaisha (company).
NGK Spark Plugs are also used by a variety of Formula One teams including Ferrari, McLaren, Sauber, Force India and Scuderia Toro Rosso. NGK Spark Plugs was exclusive spark plug supplier for IndyCar Series since 2007 until 2011. But in 2012 until present, NGK only supplied for Honda-powered IndyCar Series teams. NGK Spark Plugs currently exclusive spark plug supplier for MotoGP, Moto2, Moto3 and Superbike World Championship for motorcycle racing category.