TN Corporation (NTN株式会社, NTN Kabushiki-gaisha) (a.k.a. Niwa, Tomoe, Nishizono) is one of the most prominent manufacturers of <a href="https://en.wikipedia.org/wiki/Bearing_(mechanical)" target="_self">bearings</a> in <a href="https://en.wikipedia.org/wiki/Japan" target="_self">Japan</a>, second domestically only to <a href="https://en.wikipedia.org/wiki/NSK_Ltd." target="_self">NSK Ltd.</a> The company is one of the largest exporters worldwide of <a href="https://en.wikipedia.org/wiki/Friction#Reducing_friction" target="_self">friction-reducing products</a> such as <a href="https://en.wikipedia.org/wiki/Constant-velocity_joint" target="_self">constant-velocity joints</a>.

NSK Ltd. (日本精工株式会社, Nippon Seikō Kabushiki-gaisha, Japan Precision Company), also known in some markets as NSK Automation, is a large manufacturer of <a href="https://en.wikipedia.org/wiki/Bearing_(mechanical)" target="_self">bearings</a> globally and the largest in <a href="https://en.wikipedia.org/wiki/Japan" target="_self">Japan</a>. The company produces industrial machinery bearings, precision machinery and parts, and automotive bearings and components.

NMB Technologies Corporation is a MinebeaMitsumi Group company; the world’s largest manufacturer of NMB miniature ball bearings and a volume leader in the design and manufacturing of precision electro-mechanical components such as small motors, backlight and LED lighting products, and sensors. NMB provide advanced technology solutions for automotive, medical, consumer, industrial and smart cities markets.

The main purpose of bearings is to prevent direct metal to metal contact between two elements that are in relative motion. This prevents friction, heat generation and ultimately, the wear and tear of parts. It also reduces energy consumption as sliding motion is replaced with low friction rolling

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