What Sumihatsu does

Sumihatsu Co., Ltd. (株式会社スミハツ) is a Japanese specialty industrial manufacturer operating across three core product lines: leaf springs, hot-formed coil springs, and railway track products. Founded in 1960 through the merger of Yamamoto Hatsujo Bunki (1908) and Nitto Industries (1934) as a Sumitomo Metal Industries affiliate, the company came under NHK Spring Co., Ltd. (Nipparts) control in 1975 and now operates as a consolidated subsidiary of the world's largest spring manufacturer. Headquartered in Sakuragawa City, Ibaraki Prefecture with a dedicated Sales Division in Tokyo and Osaka Branch, Sumihatsu employs approximately 430-460 people.

The company's leaf spring business holds No.1 domestic market share in Japan for truck leaf springs, producing over 50% of NHK Spring Group's domestic leaf spring output and serving all major domestic commercial vehicle OEMs including Isuzu, Hino, UD Trucks, and Mitsubishi Fuso. The coil spring segment manufactures hot-formed springs exceeding one meter in length for construction machinery (Komatsu, Kobelco, Kubota), industrial robotics (FANUC, Yaskawa), railway vehicles, elevators, and aerospace applications including H-II rocket fairing springs. The railway track products division operates as Japan's oldest turnout manufacturer (heritage tracing to 1908), supplying turnouts, licensed Pandrol clips, synthetic sleepers, LevelKeeper automatic correction devices, and bearing floor panels to all JR Group companies, Tokyo Metro, major private railways, and export customers in Taiwan, Bangladesh, Indonesia, Myanmar, and South Korea.

Sumihatsu generates revenue through direct B2B enterprise sales with no disclosed distributor network, manufacturing to customer specifications under long-tenure supply relationships. Products are designated critical safety components where qualification cycles create significant switching costs. The company holds ISO 9001 (1999, 2000) and ISO 14001 (2003) certifications, is the sole Japanese manufacturer of steam locomotive leaf springs, and one of few domestic producers of elevator safety U-springs. Pricing is not publicly disclosed; employment compensation data indicates mid-career annual salary from ¥4,000,000 with average 6.0-month bonuses. The company maintains a wholly-owned nursing care subsidiary (Sumihatsu Service Co., Ltd., established 1995) as a non-core diversification.

Name

Sumihatsu

Legal name

株式会社スミハツ (Sumihatsu Co., Ltd.)

Website

https://sumihatsu.com

Company type

Private

Founded year

1960

Operating status

Operating

Headcount range

251–500 employees

Short description

Sumihatsu Co., Ltd. is a Japanese specialty manufacturer of leaf springs, hot-formed coil springs, and railway track products (turnouts, Pandrol clips, synthetic sleepers), serving all major domestic truck OEMs, JR Group railway operators, and industrial machinery builders as a consolidated subsidiary of NHK Spring Group.

Ownership category

akta.pro rank

Headquarters

HQ city

Sakuragawa

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Leaf Spring Manufacturing and Sales: Manufacture and sale of leaf springs primarily for domestic truck and commercial vehicle manufacturers. As the largest leaf spring manufacturer in the NHK Spring Group, Sumihatsu produces over 50% of the group's domestic output. Products include suspension leaf springs for large trucks, medium/small trucks, tapered leaf springs, steam locomotive springs, elevator safety U-springs, and transverse leaf springs for small trucks. Revenue is generated through direct B2B sales to major domestic truck manufacturers.
2. Coil Spring Manufacturing and Sales: Manufacture and sale of hot-formed coil springs for industrial machinery, construction equipment, railway vehicles, elevators, and space rockets. Products include idler wheel springs for bulldozers, axle springs for railway vehicles, elevator safety springs, robot arm springs, rocket fairing springs, and torsion bars for railway vehicles. Revenue is generated through direct sales to equipment manufacturers and railway operators.
3. Railway Track Products Manufacturing and Sales: Design, manufacture, and sale of railway track products including turnouts, rail fastening devices, synthetic sleepers, Pandrol clips (licensed), LevelKeeper automatic correction devices, bearing floor panels, and balancers. Products serve JR groups, private railways, and overseas railway operators in Taiwan, Bangladesh, Indonesia, Myanmar, and South Korea. Revenue is generated through direct sales to railway operators and system integrators.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels5 records

Core offering

Sumihatsu designs and manufactures industrial springs and railway track components as a B2B supplier. Its core offerings comprise three product lines: (1) leaf springs for trucks, buses, steam locomotives, and elevator safety devices; (2) hot-formed coil springs for construction machinery, industrial robots, railway vehicles, elevators, and rocket fairings; and (3) railway track products such as turnouts, rail fastening devices (including licensed Pandrol clips), synthetic sleepers, LevelKeeper automatic ballast correction devices, bearing floor panels, and balancers. The company supplies major domestic truck manufacturers, JR Group companies, private railways, and overseas railway operators directly through its own sales organization.

Product overview

Sumihatsu manufactures three core product lines: (1) Leaf Springs for automobiles and commercial vehicles including trucks, buses, and special applications like steam locomotives and elevators; (2) Coil Springs (hot-formed) for construction machinery, industrial robots, railway vehicles, elevators, and aerospace applications including H-II rockets; and (3) Railway Track products including turnouts (switches), Pandrol clips, synthetic sleepers, LevelKeepers, bearing floor panels, and balancers. As part of NHK Spring (ニッパツ) Group, Sumihatsu produces over 50% of the group's domestic leaf spring output and serves as Japan's oldest turnout manufacturer. The company operates as a comprehensive railway equipment maker with global reach.

Differentiator

Problem solved

Functional benefit

Products and services

• Leaf Springs for Trucks and Buses (板ばね) Leaf springs for commercial vehicles including trucks and buses, used for suspension systems that absorb road vibrations and reduce impact on drivers, passengers, and cargo. Sumihatsu holds the top domestic market share for these products.
• Steam Locomotive Leaf Spring (蒸気機関車用板ばね) Leaf springs installed between steam locomotive carriages and bogies. Sumihatsu is the only company in Japan with the manufacturing equipment and technology to produce these springs, including for exhibition vehicles.
• Elevator Safety Device U-Spring (エレベーター用板ばね) U-shaped leaf spring functioning as an emergency brake component for elevators. Requires precise stress calculation and high technical skill; Sumihatsu is one of few companies that can produce U-springs.
• Coil Springs for Industrial Applications (巻ばね) Hot-formed coil springs for various applications including construction machinery, industrial robots, railway vehicles, elevators, and space rockets. Sumihatsu is one of a limited number of domestic manufacturers capable of producing large hot-formed springs exceeding 1 meter in length.
• Rocket Fairing Spring (ロケットのフェアリング開頭用ばね) Spring for opening rocket fairings that protect satellites. Manufactured by Sumihatsu for use on Japanese H-II rockets after passing strict quality inspections.
• Turnouts (分岐器) Devices for safely changing the traveling direction of railway vehicles. Sumihatsu handles the full process from on-site surveys for new lines through rail machining, assembly, inspection, and shipping. Japan's oldest turnout manufacturer.
• Pandrol Clips (パンドロール) Rail and sleeper fastening product manufactured under license from Pandrol Track Systems Ltd. (UK). Fastens rails and sleepers without bolts using spring force, eliminating bolt tightening and reducing maintenance burden.
• Synthetic Sleepers (合成まくらぎ) Glass-fiber-reinforced synthetic sleeper (molded product) using urethane resin foam and unsaturated polyester. Used for turnouts and bridges with high ratings for noise and vibration reduction.
• LevelKeeper (レペルキーパー) Automatic correction device for ballasted tracks that prevents rail rise caused by crushed stone sinking under train loads, reducing railway maintenance costs.
• Bearing Floor Panels (ベアリング床板) Turnout component in which the rail-supporting portion uses ball bearings to ensure smooth rail switching, preventing turnout failures and reducing maintenance frequency such as lubrication.
• Balancer (バランサ) Spring-type balancer that absorbs railway wire expansion and contraction and automatically adjusts tension to a constant value, enabling maintenance-free operation.
• Railway Vehicle Torsion Bars (鉄道車両用トーションバー) Springs for preventing swaying during railway travel and improving vehicle stability on curves. Introduced on high-speed vehicles operating on tracks with many curves.

Quantifiable outcome

• Over 50% of NHK Spring Group's domestic leaf spring production manufactured by Sumihatsu
• +4 more outcomes

Named customers19 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature9 records

Partnerships

Two partnerships are on record, tiered core and flagship.

• Pandrol Track Systems Ltd. (パンドロール社)coreTechnology or Integration · 1 January 1997Business cooperation agreement signed in 1997 for manufacture of Pandrol rail clips under license. Full-scale production began in 1998. Pandrol clips fasten rails and sleepers without bolts using spring force. This is a significant technology partnership giving Sumihatsu access to a globally recognized rail fastening brand for the Japanese and export markets.
• NHK Spring Co., Ltd. (日本発条株式会社 / ニッパツ)flagshipOthersNHK Spring Co., Ltd. is the parent company and sole major shareholder of Sumihatsu. Sumihatsu is a consolidated subsidiary of the world's top spring manufacturer (NHK Spring Group). The parent company's R&D capabilities, technical knowledge, and global network support Sumihatsu's product development and market positioning. Sumihatsu produces over 50% of the NHK Spring Group's domestic leaf spring output.

Scale indicators7 records

Recent moves9 records

Expansion highlights6 records

Others

• Sumitomo Riko Company, Ltd. Japanese manufacturer of anti-vibration rubber products, automotive hoses, and damping components. Adjacent supplier of vibration control solutions for automotive and railway applications; serves overlapping customers (truck OEMs, railway operators) but with rubber-based polymer technologies rather than metal spring solutions like Sumihatsu.
• Proterial, Ltd. (formerly Hitachi Metals): Japanese manufacturer of specialty steel products including materials for springs used in automotive and railway applications. Supplier to spring manufacturers including Sumihatsu, which cites joint development of high-strength coil spring materials that exceed JIS standards; operates upstream in the spring value chain as a materials partner.
• Trelleborg AB: Swedish engineered polymer solutions company with anti-vibration and damping products for automotive, railway, and industrial applications. Adjacent competitor in vibration control solutions with overlapping end markets (vehicle suspension, railway infrastructure) but different core technologies (engineered polymers vs. metal springs).

Broad incumbents

• Voestalpine Railway Systems: Division of Voestalpine AG, one of the world's largest manufacturers of railway infrastructure including turnouts, rail fastening systems, and signaling. Overlaps with Sumihatsu's railway track products (turnouts, fasteners) but as part of a much broader steel and railway portfolio with significantly larger scale and global reach.
• Progress Rail Services (Caterpillar): Railway products and services subsidiary of Caterpillar, offering rail infrastructure, locomotives, and signaling. Competes in the broader railway track products market with significant global reach, but operates as part of a much larger industrial conglomerate with broader product portfolio beyond track components.

Direct peers

• Pandrol (Delachaux Group): Global leader in rail fastening systems, including the Pandrol clip product that Sumihatsu manufactures under license since 1997. Pandrol competes in railway track fastening worldwide and is both a licensor to Sumihatsu and a directly comparable player in the rail fastening segment for global railway operators.
• Chuo Spring Co., Ltd. Japanese spring manufacturer producing leaf springs, coil springs, and torsion bars for automotive, railway, and industrial applications. Directly competes with Sumihatsu in Japanese truck leaf springs and railway vehicle springs with a similar blue-chip OEM customer base including major Japanese truck manufacturers and railway operators.
• Mitsubishi Steel Mfg. Co., Ltd. Japanese manufacturer specializing in springs (leaf springs, coil springs) for automotive and railway applications, as well as specialty steel products. Direct competitor in the Japanese truck and rail spring markets with comparable customer relationships to Japanese OEMs and similar exposure to domestic truck and railway industry dynamics.
• NHK Spring Co., Ltd. (Nippta): Parent company and the world's largest spring manufacturer. NHK Spring produces automotive springs, railway springs, and precision springs globally, directly competing with and encompassing Sumihatsu's product portfolio. As Sumihatsu is a consolidated subsidiary producing >50% of the group's domestic leaf springs, NHK Spring is the closest comparable in terms of products, customers, and manufacturing capabilities.
• Vossloh AG: German railway infrastructure company specializing in turnouts (switches), rail fastening systems, and track maintenance services. Directly comparable to Sumihatsu's railway track business, particularly in turnouts and fastening products, with global reach across European, Asian, and other railway markets that overlap with Sumihatsu's overseas presence.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks5 records

Key highlights7 records

Customer concentration

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Subsidiaries1 record

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 Sumihatsu