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TPR Co., Ltd.

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TPR Co., Ltd. is a Japanese company that provides piston rings, valve seats, and other powertrain and frontier products and services.

Last updated September 10, 2026

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First read
Nov 4, 2026
Latest read
Nov 4, 2026

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Overview

TPR Co., Ltd. (TPR株式会社) is headquartered in Chiyoda-ku, Tokyo, and describes its business around powertrain and frontier fields as well as other products and services. Its official site presents piston rings and valve seats as products, and its corporate overview lists offices, plants, a technical center, a frontier innovation center, and group companies.

Products and positioning

  • Piston rings

    Piston rings are parts between the piston and cylinder that help the engine work efficiently; they have four main functions: sealing combustion gas, controlling lubricating oil, transferring heat, and supporting piston posture.

  • Valve seats

    Valve seats are the seats for intake and exhaust valves; they contact the valve and keep the combustion chamber airtight, and are produced by a sintering method.

Sources4 sources

  1. 1TPR株式会社tpr.co.jp
  2. 2会社概要 | TPR株式会社tpr.co.jp
  3. 3ピストンリングとは？ | TPR株式会社tpr.co.jp
  4. 4バルブシートとは？ | TPR株式会社tpr.co.jp

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