NGK

NGK spark plugs trace back to NGK Insulators, which began selling spark plugs in 1930. The spark plug division was spun off in 1936 as NGK Spark Plug Co., Ltd., and production of NGK spark plugs began in 1937. The company's English name was later changed to Niterra.

In North America the brand is handled by Niterra North America, Inc., which offers ignition parts such as spark plugs, coils and wire sets, along with sensors such as oxygen sensors. It is the largest supplier and manufacturer of spark plugs and sensors for import and domestic vehicles.

• Spark plug company founded: 1936 (production from 1937)
• Parent company: Niterra Co., Ltd.
• Makes: spark plugs, ignition coils, wire sets, sensors