Nippon Piston Ring Co., Ltd.

Company Profile

■URL

https://www.npr.co.jp/english/

■Address

5-12-10, Honmachi-Higashi, Chuo-ku, Saitama City, Saitama, 338-8503, Japan

Business Overview

-A manufacturer specializing in internal combustion parts, including piston rings, valve seats, and valve train parts.

-Riken Corporation (Riken) and Nippon Piston Ring Co., Ltd. (NPR) announced that they have established a wholly owning parent company of both companies, NPR-RIKEN Corporation, through a joint share transfer.

Featured report
2023 Business Overview of Japanese Suppliers	Featured report

Shareholders

Nippon Piston Ring Corporation became a wholly owned subsidiary of NPR-RIKEN Corporation in October 2023 and was delisted.

Shareholders of NPR-RIKEN (Listed on the Prime Market of the Tokyo Stock Exchange on October 2, 2023)

(As of Mar. 31, 2024)

Name or Company Name	Investment Ratio (%)
The Master Trust Bank of Japan, Ltd. (Trust Account)	8.79
Individual shareholder	5.65
Mizuho Bank Ltd.	3.46
Nippon Life Insurance Company	3.31
Custody Bank of Japan, Ltd. (Trust Account)	2.60
Daishi Hokuetsu Bank, Ltd.	2.28
NPR-RIKEN Employee Stock Ownership Association	2.01
Sumitomo Mitsui Trust Bank, Limited.	1.86
MUFG Bank, Ltd.	1.81
Riken Kashiwazaki Stock Ownership Association	1.78
Total	33.55

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Products

Power train parts
-Piston rings

Piston rings for gasoline engine
Piston rings for diesel engine
Piston rings for rotary engine

-Cylinder liners

Valve train parts
-Valve seats

Valve seat inserts

-Camshafts

Composite camshafts
Alloy cast iron camshafts

-Valve rocker arms or Others

Valve rocker arms
Valve lifters
Valve guides
Rocker bridges

Other
-Component parts to strengthen aluminum body (material to strengthen bearing)
-Fuel injector parts
-Synchronizer rings

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History

Dec. 1934	Established as Nippon Piston Ring in Shiba-ku, Tokyo. Set up the Kawaguchi Plant.
Apr. 1939	Opened the Yono Plant.
May 1949	Listed on the First Sections of both the Tokyo and Osaka Stock Exchanges.
Feb. 1960	Headquarters moved to Chiyoda-ku, Tokyo.
June, 1964	Established Nippon Ring Service.
May, 1998	Headquarters moved to Yono, Saitama.
Oct. 1998	NPR Fukushima and NPR Iwate received the TPM Award.
Jan. 1999	Yono Plant ISO9001 certified.
Nov. 1999	Tochigi Plant received the TPM Award.
Jan. 2000	Automotive piston ring business received QS9000 certification.
Feb. 2000	NPR Fukushima Works Co., Ltd. received ISO9001 certification.
Dec. 2000	Received ISO14001 certification at the headquarters.
Dec. 2000	NPR Fukushima Works Co., Ltd. received QS9000 certification.
Sep. 2001	Tochigi Plant received ISO9001 and QS9000 certifications.
Nov. 2001	NPR Fukushima Works Co., Ltd. received ISO14001 certification.
Dec. 2001	Acquired 100 percent ownership of Siam NPR Co., Ltd. in Thailand.
May 2002	Tochigi Plant received ISO14001 certification.
Sep. 2002	NPR Iwate Co., Ltd.'s Ichinoseki plant started partial operations.
Feb. 2003	The whole domestic operations were ISO14001 certified.
Aug. 2004	Established NPR Manufacturing Michigan Inc. in the U.S.A.
Oct. 2004	The whole domestic operations were ISO/TS16949:2002 certified.
Feb. 2005	Established NPR Auto Parts Manufacturing (Yizheng) Co., Ltd. in China.
Mar. 2006	Established NPR Manufacturing Indonesia Inc. in Indonesia.
Apr. 2006	Established NPR Auto Parts Manufacturing (Jiangsu) Co., Ltd. in China.
May 2006	Established NPR Manufacturing Kentucky, LLC in the U.S.A.
Jun. 2006	Established NPR US Holdings in the U.S.A.
Sep. 2007	Signed an agreement forming a global business alliance with KS Kolbenschmidt GmbH based in Germany.
Jan. 2011	Merged operations of NPR of America, LLC; NPR Manufacturing Michigan LLC; and NPR Manufacturing Kentucky, LLC into NPR US Holdings, and established NPR of America, Inc.
Mar. 2011	Acquired 100 percent ownership of NPR Shimane Co., Ltd.
Dec. 2011	Established NPR Auto Parts Manufacturing India Pvt. Ltd.
Mar. 2012	Merged the operations of NPR Kawaguchi Works and NPR Logistics Center.
Jul. 2012	Dissolved the operations of NPR Auto Parts Manufacturing (Zhenjiang) Co., Ltd. and merged them into NPR Auto Parts Manufacturing (Yizheng) Co., Ltd., which became the surviving company.
Dec. 2012	Established NPR Powdered Materials Manufacturing (Yizheng) Co., Ltd. in China.
July 2013	Dissolved joint venture contract with TPR for PT.NT Piston Ring Indonesia, and acquired a 100 percent ownership in PT.NT Piston Ring Indonesia.
Oct. 2013	Converted NPR Powdered Materials Manufacturing (Yizheng) Co., Ltd. into a joint venture with ASIMCO Shuanghuan Piston Ring Co., Ltd. (Yizheng) (currently called ASIMCO Shuanghuan Piston Ring (Yizheng) Co., Ltd.) Changed the joint venture’s name to Yizheng NPR ASIMCO Powder Metallurgy Manufacturing Co., Ltd.
May 2014	Acquired the powder metallurgic ejection-molding business from Sumitomo Metal Mining Co.
Oct. 2018	Transferred some of the shares of its wholly-owned subsidiary, NPR of Europe GmbH (NPR of Europe), to Daido Metal Co., Ltd.
Apr. 2021	Absorbed and merged Nippon Ring Service Co., Ltd. and NPR Business Service Co., Ltd.
Jan. 2022	Acquired all shares of Normeca Asia Co., Ltd., making it a subsidiary.
Oct. 2023	Merged with RIKEN CORPORATION, and established NPR-RIKEN CORPORATION