Yanagawa Seiki

What Yanagawa Seiki does

Yanagawa Seiki Co., Ltd. (柳河精機株式会社) is a privately held Japanese automotive components manufacturer founded in 1952, headquartered in Kameyama, Mie Prefecture. The company produces aluminum die-cast and forged components for major automotive OEMs and Tier 1 suppliers, with two core product lines: aluminum die-cast parts (engine components such as chain cases and bearing caps, transmission cases, suspension hubs and spindles, and EV/HEV/PHEV parts including RMCU covers and PDM cases) and forged parts (shafts, differential cases, and complex-shape 2R general-purpose components). Its proprietary technology stack includes 40+ years of die-casting expertise, 60+ die-cast machines globally, and patented forging methods (gear tooth forging, thin-wall forging, pulser forming, undercut forging, cross-roll + upset forging composite) that achieve 10–20% material savings; the original 4-pinion differential (in mass production since 2002) is a notable product differentiator.

The business model is B2B direct sales of custom-manufactured components to enterprise automotive customers, with pricing negotiated individually with each OEM. Yanagawa supplies a concentrated set of blue-chip Japanese customers including AISIN, Jatco, SUBARU, Toyota Industries, Honda, Mitsubishi Motors, and Meidensha, with manufacturing operations spanning six sites across Japan (Kameyama HQ, Kiryu, Hamamatsu-Takaoka, Hamamatsu-Inasa, Kyushu), the United States (YSK Corporation, Chillicothe, Ohio — established 1988), and Thailand (Thai Yanagawa with two plants plus Yanagawa Techno Forge Thailand). The group employs 2,322 people (March 2022).

Recent strategic posture is one of consolidation and transition: in 2022 the group absorbed Yanagawa Techno Forge and Yanagawa Machine Tech, in 2023 it announced a business integration with Daiametal, in 2024 it closed the Sayama Factory and opened a Kawagoe sales office, and it divested Kodama Chemical Industry to Mepro Holdings across 2024-2025. Alongside this restructuring, the company continues to expand its EV/HEV/PHEV aluminum component portfolio (first launched 2012) and has earned recent customer recognition (Excellence Winner from AISIN World Corp of America in 2025; Delivery Excellent Partnership 2024 from Thai Honda; selected as one of Mie Prefecture's Top 100 representative companies in 2025). Revenue is not publicly disclosed.

Name

Yanagawa Seiki

Legal name

柳河精機株式会社 (Yanagawa Seiki Co.,LTD)

Website

https://yanagawa-seiki.co.jp

Company type

Private

Founded year

1952

Operating status

Operating

Headcount range

51–100 employees

Short description

Yanagawa Seiki is a Japanese automotive parts manufacturer (founded 1952) producing aluminum die-cast and forged components, including engine, transmission, suspension, and EV/HEV/PHEV parts, for major OEMs such as Honda, AISIN, Jatco, SUBARU, and Toyota Industries, with six manufacturing facilities across Japan, the US, and Thailand.

Ownership category

akta.pro rank

Product category

Automotive Parts Manufacturing

NAICS

Motor Vehicle Parts Manufacturing (3363)

SIC

Metal Forgings & Stampings (3460)

akta.pro primary industry

Aluminum Fabrication & Finishing (Machining, Anodizing, Coating) (IMAKACAI)

akta.pro secondary industry

Wheels, Tires, Brakes & Suspension Components Manufacturing (IMACAOAH)

Keywords

• Automotive parts manufacturing
• Aluminum die casting
• Forged components
• Powertrain components
• Metal forming technologies

Headquarters

HQ city

Sayama

HQ country

Japan

HQ region

Asia

Offices13 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Automotive Component Manufacturing: Design and manufacture of aluminum die-cast components and forged parts for automotive applications. Revenue generated through direct B2B sales to automotive OEMs and Tier 1 suppliers. Products include EV components, powertrain parts, and suspension components sold as individual parts or assembled components.

Go-to-market motion2 records

Distribution channels1 record

Marketing channels3 records

Core offering

Yanagawa Seiki designs and manufactures aluminum die-cast components and forged metal parts for automotive applications, including engine components, transmission cases and covers, differential cases, suspension hubs and knuckles, and EV/HEV/PHEV components. Production is fully integrated from raw material sourcing through mold design, mold fabrication, die-casting or forging, heat treatment, and final precision machining. Outputs are sold as individual parts or sub-assemblies directly to major Japanese automotive OEMs and Tier-1 system suppliers, with export reach via group facilities in Ohio (USA) and Thailand.

Product overview

Yanagawa Seiki is a manufacturing company offering two core product lines: Aluminum Die Cast Parts and Forged Parts. The company operates an integrated production system from material to finished product, providing components for both traditional internal combustion engine vehicles and electric vehicles. Key products include 4-pinion differentials, engine and transmission components, suspension parts, and EV-specific parts. The company serves major Japanese automotive manufacturers including Honda, AISIN, Jatco, SUBARU, Toyota Industries, Mitsubishi Motors, and Meidensha.

Differentiator

Problem solved

Functional benefit

Brands

• YSK: Company abbreviation used for YSK Corporation subsidiary and group operations

Products and services

• Aluminum Die Cast Parts (アルミダイカスト部品) Aluminum die-cast components produced using 60+ die-casting machines worldwide, supported by CAE simulation, mold design, mold manufacture, and integrated machining. Product range includes engine components (chain case, bearing cap, oil pan), transmission parts (transmission case, extension case, transfer, diff-carrier, sleeve, brake piston), and EV/HEV/PHEV components (RMCU cover, intermediate plate, L side cover, PDM case). Customers are automotive OEMs and Tier-1 suppliers.
• Forged Parts (鍛造部品) Functional unit assemblies combining die-cast (DC) technology, hot forging, and cold forging capabilities. Includes 4R components such as shafts for MT and EV vehicles, CVT/MT transmission parts, differential cases, and suspension parts (hub and spindle), as well as 2R general-purpose parts with complex shapes produced in small lots. Customers are automotive OEMs and Tier-1 suppliers.
• 4-Pinion Forged Differential (4ピニオンデフ) Original Yanagawa differential product featuring a proprietary 4-pinion design that contributes to overall transmission weight reduction and cost savings. Sold to automotive OEMs and Tier-1 transmission suppliers as a sub-assembly component.
• EV/HEV/PHEV Components Aluminum die-cast components for electric vehicles, hybrid electric vehicles, and plug-in hybrid electric vehicles, including RMCU cover, intermediate plate, L side cover, and PDM case. Designed and produced for automotive OEMs' electrified powertrain programs.
• Manual Transmission Assembly Sub-assemblies and full manual transmission units, including MT mission components, supplied to Honda and other automotive customers. Backbone of Yanagawa's historical transmission business and continued series-production activity.

Quantifiable outcome

• 15% material reduction through vertical upset forging
• +4 more outcomes

Named customers7 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature9 records

Scale indicators6 records

Recent moves11 records

Expansion highlights6 records

Direct peers

• RYOBI Limited: RYOBI is a major Japanese aluminum die-casting manufacturer producing automotive powertrain and chassis components for OEMs including Toyota. Directly comparable to Yanagawa in aluminum die-casting process technology and automotive customer base.
• Aisin Corporation: Aisin is a major Japanese Tier-1 automotive parts manufacturer specializing in transmissions, drivetrain components, and aluminum casting. Yanagawa supplies Aisin directly with die-cast and forged transmission parts, making Aisin both customer and product-category peer.
• Musashi Seimitsu Industry Co., Ltd. Musashi Seimitsu manufactures transmission components (gears, shafts, ball bearings) and forged/die-cast automotive parts for global OEMs including Honda and Toyota. Directly comparable to Yanagawa's transmission component portfolio and aluminum die-casting/forging capabilities.
• Honda Foundry Co., Ltd. Honda Foundry manufactures aluminum die-cast products including engine and transmission cases for Honda Motor. As a fellow Honda supplier with similar aluminum casting processes, it is a direct functional peer to Yanagawa Seiki.
• H-One Co., Ltd. H-One is a Japanese manufacturer of automotive body frames, chassis components, and suspension parts using stamping and welding processes. Comparable to Yanagawa's chassis and suspension parts business, with overlapping Japanese OEM customer base.
• Asahi Sunac Corporation: Asahi Sunac is a Japanese aluminum die-casting specialist serving automotive powertrain and transmission applications. Directly comparable to Yanagawa in die-casting process, product category, and Japanese OEM customer focus.
• Sango Co., Ltd. Sango is a Japanese automotive parts manufacturer specializing in chassis and exhaust components with forging and welding capabilities. Comparable to Yanagawa's forged parts business and Japanese OEM supply chain position.

Broad incumbents

• G-TEKT Corporation: G-TEKT is a larger Japanese automotive parts manufacturer producing chassis frames, body components, and powertrain parts for global OEMs. Broader portfolio than Yanagawa but overlapping in chassis and aluminum-processed automotive parts.
• Toyota Industries Corporation: Toyota Industries is a major diversified automotive components manufacturer producing engines, transmissions, car air-conditioning compressors, and die-cast/forged parts. Serves as both Yanagawa customer and a broad incumbent peer in transmission and powertrain components.
• Nippon Steel Corporation: Nippon Steel is a major Japanese steel and metal products manufacturer with automotive component divisions supplying forged and specialty steel parts. Broad incumbent providing comparable forged/metal automotive components at larger scale.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/ysk-chillicothe-ohio

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries5 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 Yanagawa Seiki