What Sunlit does

Sunlit Industrial Co., Ltd. (サンリット工業株式会社) is a privately held Japanese B2B manufacturer of aluminum and plastic components, established in 1974 and headquartered in Nagai City, Yamagata Prefecture. The company operates an integrated production system spanning cold and hot aluminum forging, sub-micron CNC precision machining, impact extrusion, injection molding, and vacuum forming, with proprietary 2D/3D FEA-based forging simulation used to validate formability, material stress, and mold life before physical production. Sunlit operates five specialized factories in Japan — the Iide Forging Factory (with 1,000-ton presses), the Tobiniwa Cutting Factory, the Iide AC Factory, the Iide PC Factory, and the Miyagi Factory — plus a wholly-owned cold forging subsidiary in Rayong, Thailand (SUNLIT THAILAND, operational since 2007).

The company's customer base is concentrated in the automotive industry (vehicle components, condenser cases, impact cases, interior and exterior plastic parts), with a secondary vertical in industrial/housing equipment manufacturers. Go-to-market is direct enterprise sales through dedicated Tokyo and Nagoya offices targeting Japan's two principal automotive OEM clusters (Kanto and Chubu), with no digital or channel-partner distribution. Pricing is negotiated per contract on a one-time basis for manufactured parts; the company is ISO 9001 (since 2002) and ISO 14001 (since 2010) certified and has been consecutively recognized as a Health Management Excellent Corporation (2024, 2025) by METI and the Japan Health Council.

Sunlit is founder/family-controlled with no disclosed external private equity, venture capital, or public-market backing, and maintains three wholly-owned operating subsidiaries: Sunlit Kasei (plastic molding), Sato Seisakusho (precision machining), and SUNLIT THAILAND (cold forging). Revenue figures are not publicly disclosed; registered capital stands at ¥98 million and headcount is 368 employees as of February 1, 2026. Recent strategic activity has focused on incremental capacity expansion — most notably a second PC factory in April 2025 and prior cutting-factory expansions in 2020 and 2021 — together with a 2020 extension into iron and stainless steel (SUS) processing alongside the historical aluminum core.

Name

Sunlit

Legal name

サンリット工業株式会社

Website

https://sunlit-ind.co.jp

Company type

Private

Founded year

1974

Operating status

Operating

Headcount range

251–500 employees

Short description

Sunlit Industrial Co., Ltd. is a privately held Japanese manufacturer of aluminum forged and precision-machined components, plastic injection-molded parts, and impact-extruded products, primarily supplying automotive OEMs and industrial equipment manufacturers across Japan and Southeast Asia via five Japanese factories and a Thai subsidiary.

Ownership category

akta.pro rank

Product category

Automotive Parts Manufacturing

NAICS

Motor Vehicle Parts Manufacturing (3363), Other Aluminum Rolling, Drawing, and Extruding (331318)

SIC

Miscellaneous Fabricated Metal Products (3490), Plastics Products, Nec (3089)

akta.pro primary industry

Aluminum Value-Added Components (Automotive, Aerospace, Packaging, Building Systems) (IMAKACAM)

akta.pro secondary industry

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

Keywords

• Aluminum forging parts
• Precision machined components
• Plastic injection molding
• Automotive parts manufacturing
• Impact extruded products

Headquarters

HQ city

Yamagata

HQ country

Japan

HQ region

Asia

Offices9 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Aluminum Forging Parts Sales: Manufacturing and sales of aluminum cold forging and hot forging parts for automotive applications including vehicle components, condenser cases, and impact cases.
2. Precision Machined Parts Sales: Manufacturing and sales of precision CNC machined aluminum parts to sub-micron accuracy tolerances.
3. Plastic Molded Parts Sales: Manufacturing and sales of plastic injection molded and vacuum formed parts for automotive interior, exterior, and industrial applications.
4. Housing Equipment Components: Manufacturing and sales of housing equipment related components.

Go-to-market motion1 record

Distribution channels3 records

Marketing channels3 records

Core offering

Sunlit Industrial Co., Ltd. manufactures and sells aluminum and plastic components for industrial and automotive applications. The company produces aluminum forged parts, precision-machined parts, impact-extruded parts, and vehicle components, alongside plastic injection-molded and vacuum-formed products. It operates integrated metal and plastic manufacturing for OEM customers across Japan and Thailand.

Product overview

Sunlit Industrial Co., Ltd. is a comprehensive manufacturing company offering two core product lines: Aluminum Components and Plastic Products. The aluminum division produces forged parts, precision-machined components, and impact-extruded products using cold and hot forging technologies with dedicated forging analysis capabilities. The plastic division manufactures injection-molded and vacuum-formed interior and exterior automotive components. These products are produced across multiple specialized factories (forging, cutting, AC, PC, and Miyagi) and serve primarily the automotive industry.

Differentiator

Problem solved

Functional benefit

Products and services

• Aluminum Forged Parts
• Precision Machined Parts
• Impact Extruded Parts
• Vehicle Components
• Plastic Injection Molded Parts
• Plastic Vacuum Formed Parts

Quantifiable outcome

• Near-net-shape forging achieves material efficiency with minimal waste
• +1 more outcomes

Named customers2 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

Feature5 records

Partnerships

Three partnerships are on record, tiered core.

• SUNLIT THAILAND CO., LTD.coreOthers · 1 August 2006Overseas related company in Rayong, Thailand specializing in cold forging operations. Established in August 2006, began full operations in June 2007.
• Sunlit Kasei (サンリット化成株式会社)coreOthersRelated company specializing in plastic molding and processing. Located in Nagai City, Yamagata Prefecture.
• Sato Seisakusho (有限会社佐藤製作所)coreOthersRelated company specializing in precision cutting/machining. Located in Shirataka Town, Yamagata Prefecture.

Scale indicators5 records

Recent moves11 records

Expansion highlights5 records

Direct peers

• Ahresty Corporation: Tokyo-headquartered, TSE-listed manufacturer of aluminum die-cast products for automotive OEMs (engine, transmission, and structural components). Directly comparable to Sunlit as a Japanese mid-tier supplier of value-added aluminum components to the same Japanese automaker customer base.
• Suncall Corporation: Japanese manufacturer of precision metal parts including automotive springs and assemblies, with global operations. Comparable to Sunlit as a Japanese Tier-2 precision parts supplier serving automotive OEMs across both domestic and overseas footprints.
• Pacific Industrial Co., Ltd. TSE-listed Japanese auto parts manufacturer producing tire valves, plastic resin molded parts, and stamped metal components for OEMs. Closely comparable to Sunlit in producing both metal and plastic automotive components under an integrated production model.
• Nifco Inc. Japanese manufacturer of plastic fasteners, clips, and engineered plastic components primarily for global automotive OEMs. Comparable to Sunlit's plastic products division and shares the same Japanese mid-market automotive supplier profile.

Broad incumbents

• Kobe Steel, Ltd. Major Japanese integrated steel and aluminum manufacturer with extensive automotive aluminum sheet, extrusions, and castings/forgings business. Comparable broader space to Sunlit at substantially larger scale, supplying the same Japanese OEMs.
• UACJ Corporation: Largest Japanese manufacturer of aluminum flat-rolled products and extrusions serving automotive, aerospace, and packaging markets. Operates in the same aluminum value-added component space as Sunlit but with materially greater scale and broader portfolio.
• Nippon Light Metal Co., Ltd. Major Japanese integrated aluminum producer from bauxite processing through fabricated products including automotive aluminum parts. Comparable as a Japanese aluminum manufacturer serving automotive markets, but at substantially greater scale and vertical integration than Sunlit.
• Furukawa Electric Co., Ltd. Diversified Japanese manufacturer of metal products including aluminum and copper components for automotive and industrial applications. Comparable as a long-established Japanese metal manufacturer serving auto OEMs, though with a much broader product portfolio.
• Toyo Aluminium K.K. Japanese manufacturer of aluminum products including rolled foil, processed aluminum, and automotive parts. Comparable as a Japanese aluminum products manufacturer with automotive sector exposure, though focused on different product forms than Sunlit's forgings.
• Toyoda Gosei Co., Ltd. TSE-listed Japanese manufacturer of automotive rubber, plastic, and functional components including interior and exterior parts. Comparable to Sunlit's plastic products line serving Japanese OEMs, though with a broader geographic footprint and product range.

Market position

Strengths5 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

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 Sunlit