Niterra. 

Niterra Co., Ltd., formerly known as NGK Spark Plug Co., Ltd., is a leading Japanese manufacturer that, through its subsidiaries, specializes in two main areas: ignition components for internal combustion engines and a broad spectrum of advanced ceramic products. Its operations span across Japan and globally. The company's offerings include a comprehensive line of spark plugs, suitable for both original equipment manufacturers and aftermarket applications, alongside specialized igniter plugs and their associated resistor cables and covers. It also produces various glow plugs, available in ceramic and metal designs, complete with glow controllers. Beyond ignition, Niterra manufactures essential sensors, such as those for oxygen, NOx (nitrogen oxide), temperature, and knock detection. The firm also contributes to the electronics industry with semiconductor packages and substrates, including integrated circuit (IC) packages vital for smart devices and other electronics, as well as components used in semiconductor fabrication. Additionally, it develops and supplies medical products. Its fine ceramics division creates a diverse range of products, including wear-resistant parts, ultrasonic transducers and sensors, items for semiconductor manufacturing equipment, and various electrical and industrial ceramic goods. Furthermore, Niterra is a significant provider of cutting tools, featuring a wide array of grades such as ceramic, cermet, micro grain carbide, coated carbide, and cubic boron nitride, in addition to solid state and rotational tools. Key products are marketed under two distinct brands: NGK is reserved for its ignition components (spark and glow plugs), while its extensive portfolio of sensors, semiconductor packages/substrates, cutting tools, and fine ceramics are unified under the NTK brand. Established in 1936, Niterra Co., Ltd. is headquartered in Nagoya, Japan.