Suncall Corporation

Company Profile



14, Nishiura-cho, Umezu, Ukyo-ku, Kyoto-hu, 615-8555, Japan

Business Overview

-The Company is a major supplier of automotive engine valve springs.

-The Company manufactures and sells products under the following lines of business: automotive, electronic telecommunications, and other. Automotive products account for 64% of companywide sales.

-The automotive-parts sector is further divided into the following two areas.

  • Materials: Oil tempered wire, hard-steel wire, piston-ring material, precision deformed wire, precision piano wire
  • Automotive products: Valve springs for engines, automatic transmission parts , functional parts for automotive safety equipment, sensor rings for ABSs, actuators for ABSs, valve cotters, clamping bushes, deformed springs, deformed rings, formed springs, leaf springs, reactor coils, LED products, busbars, shunt busbars, electric-current sensors


-Moved to the Prime Market of the Tokyo Stock Exchange. (As of Mar. 31, 2023)
Name or Company Name Investment Ratio (%)
The Master Trust Bank of Japan, Ltd. 22.37
Marubeni Itochu Steel Inc. 15.42
Itochu Corp. 4.43
Suncall Employee Stock Ownership Plan 3.11
The Custody Bank of Japan, Ltd. 2.95
Bank of Kyoto, Ltd. 2.53
Kyoto Chuo Shinkin Bank 1.20
Nippon Life Insurance Company 0.81
Apollo company limited 0.67
Total 54.37


Automotive parts and related products
High precision parts
-Engine valve springs 
-Spiral springs for variable valve timing control
-Valve cotters
-Wave springs
-Wave rings
-Springs for transmission
-Shaped rings
-Accordion springs
-Drive plates
-Ring gears
-Boot clamps
-ECU control parts
-Sensor rings
-Spiral springs for seat belts
-Tension reducers
-Detent springs
-Shunt on bus bars
-Bus rings
-Bus bars
-Motor cores/stator cores
-Reactor coils
-Small article springs
-Measuring pins for wire harness
-Press parts
-Heat resistant springs


Jun. 1943 Established as "Sanko Senzai Kogyo Co., Ltd."with capital of 1.7 million yen to manufacture and process piano wires, springs and other wiring products.
Jun. 1952 Began supplying automotive-engine spring valves to several companies, including Toyota.
Jun. 1953 Successfully began mass-producing bead-wires for car tires.
Oct. 1964 Listed on the Osaka Stock Exchange Second Section.
Oct. 1967 Established Toyota plant in Aichi Pref.
Dec. 1972 Established Suncall Sendai in Miyagi Pref.
Feb. 1974 Established Suncall Kikuchi Corp. in Kumamoto Pref.
Mar. 1981 Established Suncall Engineering in Yamanashi Pref.
May 1989 Established Suncall Sanko Corp. in Michigan, USA with 100% ownership.
Jun. 1989 Established Sanko Peterson Corp. with 50% ownership by Suncall Sanko Corp. in Michigan, USA.
Nov. 1989 Established Hirose Plant in Toyota, Aichi.
Apr. 1991 Changed the company name to Suncall Corporation.
Apr. 1992 Established Suncall Co., (H.K.) Ltd. in Hong Kong with 100% ownership.
Nov. 1992 Constructed the Hirose Plant as a subsidiary called Hirose Technology Corporation.
Mar. 1994 Sanko Co., (H.K.) Ltd. built a factory in Shenzhen, China.
Mar. 1995 Acquired ISO9001 certification for the design and development of automotive-engine valve-spring material and suspensions for HDDs; and ISO9002 for the production of automotive-engine valve spring material.
Jan. 1997 Closed Suncall Sendai, transferring the operations to Suncall Kikuchi Corp.
Oct. 1997 Established PT. Suncall Indonesia (a subsidiary) in Indonesia.
Jan. 2000 Established Suncall America Inc. (a subsidiary) in North America.
Nov. 2000 Established Suncall High Precision (Thailand) Ltd. (a subsidiary) in Thailand.
Feb. 2001 Liquidated Suncall Sanko Corp.
Dec. 2001 Listed on the Osaka Stock Exchange First Section.
Jan. 2004 Converted Sanko Peterson Corp. in the U.S.A., a company in which the Company had a 57% holding, into a 100% wholly owned subsidiary and merged the operations into Suncall America Inc.
May 2004 Constructed the Nano Tech Center within the premises of the home office.
Mar. 2006 Established Suncall (Guangzhou) Co., Ltd. in Guangzhou, China.
Apr. 2009 Merged its subsidiary, Hirose Technology Corporation.
Dec. 2012 Invested in Kobelco Spring Wire (Foshan) Co., Ltd. through Kobe Steel Company.
Jul. 2013 Listed in the first section of Tokyo Stock Exchange, after the merger of the Tokyo Stock Exchange and Osaka Stock Exchange.
Sep. 2013 Established Suncall Technologies Mexico, S.A. de C.V. in Aguascalientes, Mexico.
Nov. 2013 Established a joint venture called K&S Wire Co., Ltd. in Yangsan, South Korea.
Jun. 2014 Established Suncall (Tianjin) Co., Ltd. in Tianjin, China.
Oct. 2014 Established a joint venture called HS Power Spring Mexico S.A. de C.V. in Aguascalientes, Mexico.
Jan. 2017 Established Suncall America Inc. Dallas Office in Dallas, Texas.
Apr. 2020 Established the Kyoto Minami Plant in Kyoto’s Minami Ward.
Feb. 2022 Acquired IATF16949 for the production of shunt busbars at the Kyoto Minami Plant.

Supplemental Information 1