A ceramics family, an insulator maker and a spark plug division.

NGK’s story begins inside a ceramics group. Niterra’s own corporate history traces the company back to Morimura Gumi, the trading house founded in 1876 by the brothers Ichizaemon and Toyo Morimura. In 1904, the history says, the founders of Morimura Gumi set up the porcelain maker that is now Noritake; its sanitary ceramics division was spun off in 1917 as the company now called TOTO, and its insulator division was spun off in 1919 as NGK Insulators.

Spark plugs came out of that insulator business. According to the same history, NGK Insulators began research on spark plugs in 1921 and launched spark plugs for sale in 1930. In 1936 the spark plug division was spun off as a separate company, NGK Spark Plug Co., Ltd., based in Nagoya. The corporate profile gives the date of establishment as 26 October 1936 and marks 11 November as the anniversary of the company’s foundation; the European website gives 11 November 1936 as the founding date. In 1937, the history says, the new company started production of NGK spark plugs.

The company credits its first president, Magoemon Ezoe, with a philosophy built around making quality products and the participation of every employee. The history describes this as the spirit of monozukuri, the Japanese idea of dedicated manufacturing, and says it has been passed down through the generations of the company.

A second brand followed the first. In 1949, according to the history, the company began making NTK technical ceramics and listed on the Tokyo and Nagoya stock exchanges; the European website says the founders created the NTK brand name at that time. In 1958 the company began making ceramic cutting tools and inserts, and the same year it started making copper-cored wide-range spark plugs. From then on the business ran under two names: NGK for spark plugs and the ignition parts around them, and NTK for ceramics and electronic parts.

A Japanese plug made in many countries.

The plug travelled early. In 1959 the company built a spark plug factory in Brazil, which its European history describes as a major step toward becoming a global corporation. At home, the Komaki factory in Aichi prefecture began operating in 1962.

Subsidiaries followed abroad, according to the corporate timeline: a sales company in the United States in 1966, Malaysia in 1973, NGK Spark Plug (U.K.) in 1975, a US manufacturing company in 1976, Indonesia in 1977, and a German company in 1979, now NGK Spark Plug Europe GmbH, based in Ratingen. Companies in Australia and Canada came in the early 1980s, and the timeline continues through Mexico, Singapore, China, Thailand, India, South Africa, the Philippines and Vietnam in later decades.

The product range widened as engines changed. The company says it started making oxygen sensors for cars in 1982, ceramic-type glow plugs in 1985, NGK “Iridium” plugs in 1997 and NGK “Iridium IX” plugs in 2000. In 2015, according to the timeline, it acquired the vehicle electronics business of the US company Wells.

Manufacturing has moved within the group as well as abroad. The timeline records that in 2021, after an organisational reform, a group subsidiary, SparkTec WKS Co., Ltd., took over the company’s spark plug manufacturing business. The corporate profile, current in July 2026, lists the company’s own factories as Komaki, Satsuma and Ise, and its headquarters in Nagoya.

The biggest change was the name. In 2020, the European website says, the company unveiled its 2040 Vision, “Beyond ceramics, eXceeding imagination”, and a long-term management plan called “NITTOKU BX”. It set out four business fields: Mobility, Medical, Environment & Energy, and Communications. To express that direction, the company says, it changed its English-language name from NGK SPARK PLUG to Niterra at the beginning of April 2023. English Wikipedia says the coined name joins the Latin niteo, meaning “shine”, and terra, meaning earth, and that the Japanese company name, Nippon Tokushu Tōgyō, stayed the same.

Design and documentation.

The brands in this group make motor oils, lubricants and performance parts: the fluids that go into an engine and the components that enthusiasts and workshops fit to cars, from ignition and fuel parts to brakes and suspension. Brands in this trade sit at many different points, from founding families whose surname is still on the product to names that now belong to oil majors, industrial groups or listed holding companies, and a single name can be sold on a supermarket shelf, in a parts store and on a race car.

A motor-oil or parts brand’s identity is usually carried by a can, a box, a colour and a sticker on a racing livery, because the company behind the name may have changed hands, moved its factories or grown far beyond the town where it started. That makes the plain questions worth asking: who started it, who owns it now, and where its products are actually made.

Each guide separates what independent sources record from what the company says about itself, and marks plainly what rests only on the company’s own word.

A product brand inside Niterra.

The rename split the company name from the brand on the box. On its “Our Brands” page, Niterra says its spark plugs, glow plugs and related products have been sold under the brand name “NGK” since the company was established, while IC packages, exhaust gas sensors, electrostatic chucks and other items are made under the “NTK” brand. English Wikipedia describes the automotive ranges as NGK Ignition Parts and NTK Vehicle Electronics, the second covering oxygen and other sensors.

The company name changed in 2023; the NGK brand name did not. Regional companies followed the parent: English Wikipedia says the US subsidiary, set up in 1966 and now based in Wixom, Michigan, was renamed Niterra North America in 2023, and the European company calls itself Niterra EMEA. The NGK name, meanwhile, stays on spark plugs, glow plugs, ignition coils and leads.

The family tree is still visible in the group’s own pages. Niterra’s history places the company alongside Noritake, TOTO and its former parent, which it now calls NGK Corporation, as members of the Morimura Group.

For a design guide, NGK shows how a product brand can outlast the company name it came from: a short, technical set of letters on a box, kept steady while the corporation behind it took a new name for a wider business. Compare Brembo, an Italian parts maker that also began as a small workshop, and Bilstein, another engineering name known for one component. For this guide we use a deep red, a porcelain white, a steel grey and a near-black with a sans, an unofficial interpretation; no product or logo is reproduced.

Keep NGK’s identity on hand — save it to a board in the Made Good inspiration library.