Sugiyama Seisakusho

What Sugiyama Seisakusho does

Sugiyama Seisakusho Co., Ltd. (株式会社杉山製作所) is a Japanese precision components manufacturer founded in 1955 and headquartered in Omaezaki-shi, Shizuoka Prefecture. The company specializes in the design, manufacture, and sale of commutators (commutators) used in small DC motors, serving primarily Japanese automotive Tier 1 suppliers and OEMs as well as consumer electronics, office automation, and medical device manufacturers. Since February 2021, Sugiyama has operated as a wholly-owned subsidiary of Kawashima Co., Ltd., a non-ferrous general trading company.

The company's product portfolio centers on commutators for small DC motors (used in radiator fans, wipers, power windows, fuel pumps, ABS, ESC, starters, EGR valves, and seat/mirror adjusters) and a complementary line of precision molded and metal insert-molded products (bus bars, insulators for brushless motors, solenoid valves, connectors, motor housings, and bearing housings). Production is built on a fully integrated in-house system covering 100% in-house mold manufacturing, proprietary processing and inspection equipment, automation systems, and centralized cutting-tool grinding, with CAD/CAM-based mold design supporting short lead times. The company holds five granted Japanese patents on specialized commutator architectures (PAT.2918154, PAT.4925735, PAT.5039339, PAT.5498141, PAT.3813857) plus one pending application.

Revenue is generated through B2B hardware sales of custom-manufactured components on a quote-based pricing model, with direct enterprise field sales supplemented by a sales division and online inquiry forms. Customers include leading Japanese automotive and electronics groups (AISAN, Aisin, DENSO, Honda, NIDEC, Mabuchi Motor, Panasonic, Canon, Koito, JTEKT, Hitachi Astemo, Toyota Tsusho) and select international motor manufacturers (Buehler Motor, Johnson Electric, LG Innotek, Vitesco Technologies). Manufacturing spans four sites in Japan, a wholly-owned subsidiary in South Korea (Yangsan, since 2008), and a wholly-owned subsidiary in Indonesia (Karawang, since 2015); a Shenzhen subsidiary ceased production in December 2019. The company is IATF16949, ISO9001, and ISO14001 certified across all plants.

Name

Sugiyama Seisakusho

Legal name

株式会社杉山製作所

Website

https://css-sugiyama.co.jp

Company type

Private

Founded year

1955

Operating status

Operating

Headcount range

251–500 employees

Short description

Sugiyama Seisakusho is a Japanese precision manufacturer (founded 1955, Shizuoka-headquartered) producing commutators for small DC motors and metal-insert molded components for automotive Tier 1s, OEMs, and electronics manufacturers, operating four plants across Japan plus wholly-owned subsidiaries in South Korea and Indonesia.

Ownership category

akta.pro rank

Product category

Precision Motor Components

NAICS

Motor and Generator Manufacturing (335312), Motor Vehicle Electrical and Electronic Equipment Manufacturing (33632)

SIC

Motors & Generators (3621), Electrical Industrial Apparatus (3620)

akta.pro primary industry

DC Motors (Brushed, Brushless DC) (IMAGACAB)

akta.pro secondary industries

Electrical & Electronics Injection Molded Components (Connectors, Housings) (IMANAFAD), Industrial & Machinery Injection Molded Components (Gears, Wear Parts) (IMANAFAF)

Keywords

• Commutator manufacturing
• DC motor components
• Precision insert molding
• Automotive electrical parts
• Metal stamping products

Headquarters

HQ city

Shizuoka

HQ country

Japan

HQ region

Asia

Offices6 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Commutator Manufacturing and Sales: Manufactures and sells commutators (commutators) for small motors including automotive, home electronics, OA equipment, and medical devices. Core revenue stream with fully integrated in-house production.
2. Precision Molding Products: Produces precision molded parts and metal insert molding products including bus bars, insulators for brushless motors, solenoid valves, connectors, motor housings, and bearing housings.
3. New Product Development: Custom product development services participating from design stage through prototyping and mass production for specialized commutator and molding applications.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels4 records

Core offering

Sugiyama Seisakusho manufactures commutators for small DC motors and precision molded products using metal insert molding, supplying automotive, home electronics, OA equipment, and medical device manufacturers. Production is carried out at facilities in Japan, South Korea, and Indonesia, with operations spanning prototyping through mass production of components such as commutators, bus bars, insulators, solenoid valves, connectors, motor housings, and bearing housings.

Product overview

Sugiyama Seisakusho is a precision parts manufacturer specializing in commutators (整流子) for small DC motors and precision molded products. The core product line includes commutators for automotive electrical systems, home electronics, OA equipment, and medical devices, supported by a fully integrated production system encompassing stamping, compression molding, injection molding, and finishing processes. The company also produces precision molding products and metal insert molded parts for brushless motors (bus bars, insulators), leveraging decades of commutator manufacturing expertise. New product development focuses on proprietary technologies including carbon flat type commutators and cylindrical commutator anchor shapes, protected by multiple Japanese patents.

Differentiator

Problem solved

Functional benefit

Products and services

• Commutators for small DC motors Commutators designed for use in small DC motors, supplied to automotive parts manufacturers, motor manufacturers, and home electronics OEMs. Production is supported by multiple proprietary patents and automotive-grade quality certifications.
• Precision molded products (metal insert molding) Precision metal-insert molded components such as bus bars, insulators, solenoid valves, connectors, motor housings, and bearing housings, supplied to automotive, home electronics, OA equipment, and medical device manufacturers.
• New product development and prototyping New product development services spanning prototyping to mass production of commutators and precision molded components, supporting customer-driven customization of motor and metal components.

Quantifiable outcome

• IATF16949 certification achieved for all plants (May 2018)
• +1 more outcomes

Named customers16 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators4 records

Recent moves12 records

Expansion highlights4 records

Broad incumbents

• NIDEC Corporation: Japanese-listed global leader in small precision motors and a named Sugiyama customer. NIDEC is a dominant automotive motor incumbent with extensive in-house commutator capability, making it both a buyer of specialty commutators and a potential long-term competitor through insourcing.
• Morgan Advanced Materials: UK-listed specialty materials and components manufacturer serving automotive, industrial, and electronics markets with carbon brushes, commutator materials, and related electrical components. Morgan is a large incumbent overlapping with Sugiyama's commutator and precision electrical component business.
• Johnson Electric: Hong Kong-listed global leader in motion products including small motors and commutator-based components for automotive and industrial applications. Johnson Electric is a named Sugiyama customer and a broad incumbent whose vertical integration strategy creates both partnership and competitive risks.
• Panasonic Corporation: Japanese-listed diversified electronics conglomerate and a named Sugiyama customer. Panasonic's automotive and industrial motor divisions source commutators while also possessing in-house manufacturing capabilities that overlap with Sugiyama's offerings.
• Mersen: French-listed industrial group producing electrical components including carbon brushes, commutators, and power transfer solutions for motors. Mersen's broader portfolio of electrical specialties overlaps with Sugiyama's commutator and precision molded electrical components, though Mersen is significantly larger and more diversified.

Direct peers

• Helwig Carbon Products: US-based manufacturer of carbon brushes, brush holders, and commutator components for industrial motors, traction, and automotive applications. Helwig is a focused competitor in carbon-based commutator technologies comparable to Sugiyama's patented carbon flat type commutators.
• Kolektor: Slovenian-based global manufacturer of commutators and electrical components for automotive and industrial applications. Kolektor is one of the largest dedicated commutator producers worldwide and directly competes with Sugiyama for global automotive commutator supply contracts, particularly with European Tier 1s.
• Schunk Group (Schunk Carbon Technology): German-based manufacturer of carbon brushes, commutators, and sliding electrical contacts for automotive, industrial, and traction applications. Schunk's carbon commutator product line directly overlaps with Sugiyama's patented carbon flat type commutator offerings for fuel pumps and motor applications.

Emerging players

• Mabuchi Motor: Japanese-listed small DC motor manufacturer and one of Sugiyama's named customers. Mabuchi is an emerging supplier relationship and potential vertical integrator — as Mabuchi brings motor production in-house, it could shift from customer to competitor in select commutator segments.

Others

• Kawashima Co., Ltd. Japanese non-ferrous general trading company that has been Sugiyama's parent since February 2021. As the controlling shareholder, Kawashima is the relevant counterparty for any equity transaction and provides the materials sourcing and customer network backdrop against which Sugiyama's competitive position must be evaluated.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries3 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 Sugiyama Seisakusho