Toyo Spring Industry

What Toyo Spring Industry does

Toyo Spring Industry Co., Ltd. (東洋発條工業株式会社), branded as TOHATSU, is a Japanese precision metal parts manufacturer founded in 1937 and headquartered in Matsudo, Chiba Prefecture. The company is a wholly-owned subsidiary of Tokyo Stock Exchange-listed Carlit Holdings Co., Ltd. since February 2014. It manufactures five core product lines: washers (flat, spring, and wave spring); thin plate springs including retaining rings and toothed washers; coil springs (compression, tension, torsion); precision press parts including semiconductor lead frames and engine/transmission valve seals; and composite/assembled products. The firm operates a vertically integrated production system spanning mold design, forming, heat treatment, surface treatment (including an industry-first no-hydrogen embrittlement plating process developed in 1960), and packaging, with stated monthly capacity of approximately 800 tons across four domestic sites (Matsudo headquarters, Nagoya sales office, Ishioka main factory, and Kashiwahara press-specialized factory established in 2017), supplemented by wholly-owned subsidiaries in Shanghai (2003) and Kunshan (2010) for overseas sales and manufacturing.

The company sells primarily B2B to enterprise manufacturers in automotive, construction machinery, industrial machinery, railway, and construction sectors, with a named customer roster that includes Mitsubishi Heavy Industries, Komatsu, Hitachi Construction Machinery, Kubota, Kawasaki Heavy Industries, Hino Motors, Toyota Industries, Mabuchi Motor, Hirose Electric, Caterpillar Japan, JR East, and JR West. Distribution is through direct sales and an authorized dealer network (トーハツ会) in Kanto and Kansai regions. Pricing is quote-based and not publicly disclosed, with multi-year supply contracts implied by long-tenured OEM relationships. The company holds JIS B 1251 and JIS B 2804 product certifications, ISO9001 and ISO14001 quality/environmental certifications, and operates a JAB-accredited ISO17025 testing laboratory. Capital is small (JPY 40 million registered capital) and headcount is approximately 150 employees.

The business model is high-mix, low-to-medium volume precision component manufacturing with revenue derived from one-time unit purchases of custom and standard parts under multi-year supply agreements. Differentiation rests on the proprietary no-hydrogen embrittlement plating technology, JIS/ISO certifications that gate entry into safety-critical OEM supply chains, and the integration of mold design through finishing under one roof. Vertical integration is the core operating principle, supporting both custom engineering work for Tier 1/2 automotive and heavy machinery suppliers and standard JIS-spec parts. Geographic positioning is Japan-centric with a small but established China footprint for trade and manufacturing, and there is no consumer-facing brand or digital channel.

Name

Toyo Spring Industry

Legal name

東洋発條工業株式会社

Website

https://tohatsu-i.co.jp

Company type

Private

Founded year

1937

Operating status

Operating

Headcount range

101–250 employees

Short description

Toyo Spring Industry is a Japanese precision metal parts manufacturer (founded 1937) producing washers, springs, and press components for enterprise OEMs in automotive, construction machinery, railway, and industrial machinery sectors, operating as a subsidiary of Carlit Holdings.

Ownership category

akta.pro rank

Headquarters

HQ city

Matsudo

HQ country

Japan

HQ region

Asia

Offices5 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Personnel, Operations, Infrastructure, Technology or R&D

Revenue model

1. Spring and Precision Parts Manufacturing: Manufacturing and sales of precision spring washers, coil springs, flat washers, thin plate springs, precision press parts, and retaining rings. Products are sold directly to manufacturers in automotive, construction machinery, industrial machinery, railway, and construction sectors.

Pricing tiers

Go-to-market motion1 record

Distribution channels2 records

Marketing channels3 records

Core offering

Toyo Spring Industry manufactures and sells precision spring and metal components, including washers (flat, spring, and wave spring washers), thin plate springs (retaining rings, wave washers, toothed washers, spring pins, speed nuts), coil springs (compression, tension, torsion), and precision press parts (lead frames, valve seals, stiffeners). All products are produced through in-house integrated manufacturing from mold design and tooling through heat treatment and surface finishing, serving primarily automotive, construction machinery, railway, and industrial machinery manufacturers with monthly capacity of approximately 800 tons.

Product overview

Toyo Spring Industry is a precision metal parts manufacturer offering a comprehensive portfolio of spring and hardware products. The product lineup centers on five core categories: 座金 (washers including flat, spring, and wave spring washers), 薄板ばね (thin plate springs including retaining rings and wave washers), コイルばね (coil springs including compression, tension, and torsion springs), 精密プレス (precision press products including lead frames and valve seals), and 複合品 (composite assemblies combining metal processing with welding). All products are manufactured through in-house integrated production from design and mold-making through heat treatment and surface finishing.

Differentiator

Problem solved

Functional benefit

Products and services

• Washers (座金) Washers including flat washers (平座金), spring washers (ばね座金), and wave spring washers (波形ばね座金), produced through in-house integrated manufacturing from molding to heat treatment and surface finishing for B2B customers in automotive, construction, and industrial applications.
• Thin Plate Springs (薄板ばね) Thin plate springs including C-type and E-type retaining rings (止め輪), wave washers, toothed washers, spring pins, spacers, speed nuts, and specialty thin plate springs, manufactured in-house from forming through heat treatment and packaging for B2B industrial customers.
• Coil Springs (コイルばね) Coil springs including compression springs (押しばね/圧縮ばね), tension springs (引きばね/引張ばね), torsion coil springs (ねじりコイルばね/トーションバね), and wire forming products for automotive, industrial machinery, precision equipment, and home appliances.
• Precision Press Products (精密プレス) Precision press parts including lead frames for semiconductors, stiffeners for circuit materials, valve seal hardware for automotive engines and transmissions, and other precision press components. Processes materials including 42 alloy, stainless steel, copper, and nickel alloys from 0.03mm thickness.
• Composite Products and Others (複合品・その他) Assembly services combining metal processing with embedding and welding, plus wire bands, plate clips, and machined parts such as keys and yokes for industrial customers.
• Hose Clamps (ホースクランプ) Hose clamp products including wire clamps and plate clips for automotive and industrial applications.

Quantifiable outcome

• Monthly production capacity of approximately 800 tons
• +2 more outcomes

Named customers14 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

Three partnerships are on record, tiered core.

• Japan Spring Manufacturers Association (日本ばね工業会)coreStrategic or Co-development PartnerIndustry association membership providing industry standards participation, networking, and technical knowledge sharing in spring manufacturing.
• Japan Society of Spring Engineers (日本ばね学会)coreStrategic or Co-development PartnerTechnical society membership for spring engineering knowledge exchange, research collaboration, and industry expertise development.
• Aida Engineering (アイダエンジニアリング)coreTechnology or IntegrationSupplier of heavy stamping press equipment (500-ton capacity) used for manufacturing expansion and enhanced production capabilities.

Scale indicators4 records

Recent moves6 records

Expansion highlights10 records

Direct peers

• Chuo Spring Co., Ltd. Long-established Japanese precision spring manufacturer producing coil springs, torsion springs, and flat springs for automotive and industrial machinery. Closest direct comparable in scale and legacy customer base.
• Lee Spring: Global manufacturer of standard and custom compression, extension, and torsion springs. Comparable as a precision spring manufacturer with broad catalog and custom capabilities serving industrial OEMs.
• Smalley Steel Ring Company: US manufacturer of retaining rings, wave springs, and specialty compression springs. Directly comparable in retaining rings and wave spring washers — key products for Toyo Spring.
• MW Industries: US-based manufacturer of springs, fasteners, and precision metal components (including Bokers, Century Spring). Comparable in custom precision metal part manufacturing and broad industrial OEM customer base.
• Sanshin Spring Co., Ltd. Japanese manufacturer of precision springs and formed metal parts serving automotive and industrial machinery. Similar size and product portfolio focus as Toyo Spring Industry.
• Suncall Corporation: Japanese precision spring and wire-form manufacturer with strong automotive and HDD (hard disk drive) exposure. Comparable in precision metal forming expertise and Japanese OEM customer mix.
• Kitagawa Industries Co., Ltd. Japanese manufacturer of precision metal stampings, springs, and EMI components. Comparable in precision press work and supply to automotive/electronics customers.
• NHK Spring Co., Ltd. (Nippon Hatsujo): Japan's largest spring manufacturer, serving automotive suspension, seat, and precision springs globally. Directly comparable product overlap (coil springs, precision springs) and customer overlap (Toyota, Japanese OEMs).
• Tokai Spring Manufacturing Co., Ltd. Japanese manufacturer of precision springs including flat springs, wire springs, and formed metal parts. Closely comparable in product portfolio and mid-sized Japanese private company structure.

Broad incumbents

• MISUMI Group Inc. Major catalog distributor and manufacturer of factory automation components including springs, washers, and precision metal parts. Overlaps with Toyo Spring's product categories but competes through a broader catalog and digital channel model.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance4 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Toyo Spring Industry