About Us
Since our founding, we have been trusted with our clients' spring-related problems,
building our own custom-made production system and producing a wide variety of springs.
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- Company Profile
Tokai Spring industries, Inc.
Pioneers in Custom-Made Springs for High-Mix, Low-Volume Production
About Us
Since our founding in 1934, Tokai Spring has remained committed to a single guiding principle:
to support clients who face challenges even with just one spring.
We believe that fulfilling this mission requires more than simply supplying springs with the required shape or function.
For everyone who relies on single springs—whether individuals or companies—we provide comprehensive support that goes beyond manufacturing.
This includes responding to all types of spring-related inquiries, offering technical consultation, and delivering reliable after-sales support.
Looking ahead, we will continue to listen carefully and respond sincerely to our customers’ needs.
Across a wide range of industries—including aerospace, machine tools, energy, seismic isolation, medical, semiconductor, and professional equipment—we strive to bring to life the idea:
“It would be ideal if a spring manufacturer like this existed.”
Taking on challenges that others hesitate to accept has been, and will continue to be, Tokai Spring’s core competence since our establishment.
- Main office
- 12F Nishihon-machi Intes, 2-3-10 Nishihon-machi, Nishi-ku, Osaka 550-0005 Japan
Tel: +81-6-7507-2647 Fax: +81-6-6541-3592 - Toyooka,
Kamiyoshidai
Factory - 157-21 Kamiyoshidai, Toyooka, Hyogo 668-0831 Japan
Tel: +81-796-29-5730 Fax: +81-796-29-5750 - Capital
- JPY 96,445,000
- Number of employees
- 86
- Director
- Representative Director Naokazu Natsume
- Main Products
- Metal spring manufacturing
• Hot-formed compression springs
• Cold-formed compression springs
• Disc springs
• Flat springs
Special Features
●Compression springs: maximum material diameter = 90 mm; maximum outer diameter = 600 mm
●Rapid and Optimal Design Proposals for Customer Challenges: Spring design support system “UNCLE”
●Spring Testing and Evaluation Services: Fatigue testing by spring specialists and ongoing research and development
●Spring Maintenance Services: Comprehensive spring maintenance program “RE:SPRING”
●Easy Reordering of Previously Supplied Springs: Repeat order system “Re-Order”
●ISO9001, ISO14001, and JISQ9100
●Full traceability across the entire manufacturing history
●Leading market share in niche industries including power generation, safety valves, machine tool spindles, aerospace applications, and water gate systems
Products & Services
Various Types of Springs
Compression springs, extension springs, torsion springs, disc springs, conical springs, leaf springs, rectangular-wire helical springs, wave springs, and other spring types
●Coil Springs:
From ultra-miniature sizes to ultra-large sizes
●Disc Springs:
Large disc springs and disc springs for machining center spindles
●Leaf Springs, Wave Springs, Flat Spiral Springs
●Spring Testing & Evaluation Services:
Fatigue testing, non-destructive testing, material analysis, and more
●Maintenance Services:
Spring inspection, drawing reconstruction (reverse engineering), and rapid-response support
●Tool Remake Services:Tool regrinding services
Main Industries
Our springs have been adopted across a wide range of industries, including aerospace, machine tools, energy and valve systems, seismic isolation and vibration control systems, information and communication equipment, electronics, environmental and chemical industries, water gates and bridges, industrial machinery, marine applications, medical and nursing care equipment, food processing machinery, robotics, research institutions, furniture and interior products, as well as cultural and artistic fields.
Key Applications
●Springs for Aerospace Rockets:Springs for cryogenic environments (down to −273°C), ensuring reliable operation even in outer space.
●Disc Springs for Machine Tool Spindles:Achieve 1/2 DIN standard tolerance, concentricity of 0.05 mm or less, and a 50% reduction in size.
●Springs for Safety Valves:Solve issues related to lateral loads, resulting in extended service life and stable operation.
●Springs for Seismic Isolation and Vibration Control Systems:Compression and extension springs, as well as disc springs for friction dampers.
●Water Gate Systems:Large stainless steel springs providing excellent corrosion resistance, with design and manufacturing based on precise measurement of sample components.
Delivery record
Aichi Steel Corporation China Steel Corporation CKD Corporation.
DMG MORI Co., Ltd. FANUC Corporation Fukui Seisakusho Co., Ltd.
Fukushima Ltd. Honda R&D Co., Ltd. IHI Corporation Individual Customer
Japan Railways Group JAXA JFE Steel Corporation
Kawasaki Heavy Industries, Ltd. Kobe Steel, Ltd.
KOBELCO Construction Machinery Co., Ltd. Komatsu Ltd.
Kyokuto Kaihatsu Kogyo Co., Ltd.
Mitsubishi Heavy Industries Machinery Systems, Ltd.
Mitsubishi Heavy Industries, Ltd.
Moog China Moog Japan Ltd.
NEC Corporation Nippon Cable Co., Ltd. Nippon Steel Corporation
Nissin Electric Co., Ltd. Okano Valve Mfg. Co., Ltd. Okuma Corporation
RIKEN Sharp Corporation Shimadzu Corporation Taiyo, Ltd.
The University of Tokyo Toshiba Corporation Yamaha Motor Co., Ltd.
Yamazaki Mazak Corporation
Quality & Testing System
●Certifications:ISO9001, ISO14001, and JISQ9100 (Aerospace Quality Management System)
●Testing & Analysis Capabilities:Long-term load relaxation testing, special environmental testing, FEM analysis, and non-destructive testing
●Delivery Performance:On-time delivery rate of 99.9%
Awards & Recognitions
●2008: Porter Prize
●2009:Grand Prize at the SME IT Management Excellence Awards 2009(Minister of Economy, Trade and Industry Award)
●Featured in numerous technical journals and industry publications
●2015:The 6th Monodzukuri Nippon Grand Award(Minister of Economy, Trade and Industry Award)
●2018:Selected by the Ministry of Economy, Trade and Industry as a “Regional Future-Driving Company”
Company History (Highlights)
| 1934 | Began manufacturing metal springs in Osaka, Japan |
|---|---|
| 1944 | Established Tokai Spring |
| 1951 | Completion of hot-formed coil spring factory in Fukushima-ku, Osaka |
| 1971 | Opened a new factory in Itami City, Hyogo Prefecture, and began operations as a comprehensive spring manufacturer |
| 1995 | Received ISO9001 certification |
| 2013 | Received JISQ9100 certification and completed full relocation of manufacturing facilities to Toyooka City, Hyogo Prefecture |
| 2016 | Relocated Head Office to Nishi-ku, Osaka |
| 2018 | Selected by the Ministry of Economy, Trade and Industry as a “Regional Future-Driving Company” |
| 2022 | Received “Japan’s Most Cherished Companies” Award by Society for Management That Values People |
| 2024 | Completion of Tokai Lab — Open Innovation and Collaboration Space |
| 2025 | Exhibited at the Osaka–Kansai Expo |
Contact Us
For First-Time Customers:Even if you do not have drawings, we can reproduce springs based on actual samples.For technical consultations or spring quotations
