Kakinuma Kinzoku Seiki

What Kakinuma Kinzoku Seiki does

Kakinuma Kinzoku Seiki Co., Ltd. (柿沼金属精機株式会社) is a Tokyo-headquartered, privately held Japanese non-ferrous metals specialist founded in 1926 as Kakinuma Hokichi Shoten. The company operates as a hybrid trading-and-manufacturing enterprise: it sources and sells non-ferrous materials — aluminum and aluminum alloys (sheets, coils, foil, painted fin stock), copper and copper alloys (plates, rods, tubes, level-wound coils, ripple-fin tubes, brass, phosphor bronze, nickel silver), stainless steel, titanium, and magnetic steel — and converts them in-house into precision-processed components for downstream OEMs. Its proprietary product lines include the Kakinuma Branch Kit (KBK) series for air-conditioning piping, three-way bends made by bulge forming, vacuum thermal diffusion bonding for IGBT insulated circuit substrates (SiN ceramic with copper circuit and Ni plating, supporting copper thickness of 1mm or more), brass and stainless precision-machined bodies, medical aluminum foil plates produced by high-precision thin-sheet press, heat exchangers, aluminum heat sinks, and copper pipe bending products including U-pipes.

The company's go-to-market is enterprise B2B field sales executed through a wholly-owned global network of eight subsidiaries: manufacturing operations in Japan (Fuji Matsuoka Factory and KS Corporation in Niigata), China (Suzhou for HVAC branch pipes and heat exchangers, Dongguan for OA/medical/electronic components), and Thailand (Thai Kakinuma in Pathum Thani), plus sales offices in Hong Kong, South Korea (Suwon), and the UK (Plymouth). Named enterprise customers include Daikin Industries, Mitsubishi Electric (multiple divisions), Toshiba Corporation, Canon Medical Systems, Canon Electron Tube & Device, Fujitsu General, Sumitomo Wiring Systems, LG Electronics, Meidensha, and Carrier Air Conditioning (Thailand). The company is led by third-generation President Shunjiro Kakinuma (柿沼舜一郎) and holds ISO9001 and ISO14001 certifications at multiple facilities. Pricing is negotiated B2B quotation with no public disclosure; revenue and headcount are not publicly disclosed.

Name

Kakinuma Kinzoku Seiki

Legal name

柿沼金属精機株式会社 (KAKINUMA KINZOKU SEIKI CO.,LTD.)

Website

https://kakinuma-grp.co.jp

Company type

Private

Founded year

1926

Operating status

Operating

Headcount range

11–50 employees

Short description

Kakinuma Kinzoku Seiki is a privately held Japanese non-ferrous metals trading and precision manufacturing firm serving enterprise OEMs in HVAC, medical, automotive, and electronics through a wholly-owned network across six countries.

Ownership category

akta.pro rank

Headquarters

HQ city

Tokyo

HQ country

Japan

HQ region

Asia

Offices11 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Non-ferrous metal materials sales: Sale of non-ferrous metals including aluminum, aluminum alloys, aluminum foil, stainless steel, copper, brass, phosphor bronze, nickel silver, titanium, magnetic steel, alloy castings. Core revenue stream from 90-year history as a specialized trading company.
2. Precision processed metal components: Sale of precision-processed products including copper pipe processing and brazing, brass forging and machining, press processing, aluminum die-casting and processing, aluminum heat sink processing, heat exchangers.
3. Global network and procurement services: Leveraging global manufacturing network across China, Thailand, Hong Kong, Korea, and UK to supply materials to customers with multi-location production needs worldwide.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels2 records

Core offering

Kakinuma Kinzoku Seiki is a specialist trading company that combines non-ferrous metal materials distribution with in-house precision manufacturing. It sells aluminum, aluminum alloy, copper, brass, phosphor bronze, nickel silver, and stainless steel materials, and produces a wide range of custom-processed components — including the proprietary KBK branch pipe series, pipe headers, three-way bends, brass ball valves, copper pipe bent products, aluminum heat sinks, brass/stainless precision bodies, medical aluminum foil plates, heat exchangers, and IGBT insulated circuit boards. Customers are enterprise manufacturers in HVAC, automotive, medical equipment, OA equipment, and power electronics sectors.

Product overview

Kakinuma Kinzoku Seiki is a non-ferrous metal trading company with manufacturing capabilities. The core product portfolio consists of two main material categories: Aluminum Products (アルミニウム製品) including aluminum alloys, coils, and foils; and Copper & Copper Alloys (伸銅品) including copper plates, brass, phosphor bronze, and copper tubes. These materials serve as the foundation for an extensive range of precision processed products (その他加工品), including the proprietary Kakinuma Branch Kit (KBK) series for air conditioning applications, pipe headers, three-way bends, brass ball valves, copper pipe bending products, U-PIPE, aluminum heat sinks, brass/stainless bodies, medical aluminum foil plates, heat exchangers, and IGBT insulated circuit boards. The company operates as a specialized trading house that combines material sales with manufacturing, offering both standard materials and custom precision加工品 (processed parts) to customers primarily in air conditioning, automotive, medical, and electronics sectors.

Differentiator

Problem solved

Functional benefit

Brands

• KBK (柿沼ブランチキット series): Air conditioning branch pipe series designed by Kakinuma Kinzoku Seiki for high reliability and improved construction efficiency.

Products and services

• Aluminum Products (アルミ製品) Aluminum and aluminum alloy materials (sheets, strips, coils, foil, painted fin materials for air conditioning and heat exchangers, deep-drawing materials for battery cases, plus stainless steel) supplied as raw materials to manufacturing customers.
• Copper and Copper Alloys (伸銅品) Copper and copper alloy products (plates, strips, rods, bars, wire, tubes, brass, phosphor bronze, nickel silver, white copper, level-wound coils, copper pipes, ripple fin tubes, brass round rods, brass hexagonal rods) for medical, heavy electrical, and automotive applications. Includes custom sizing and V-coat processing services.
• Kakinuma Branch Kit (KBK) Series — Air Conditioning Branch Pipes and Sockets Proprietary Kakinuma-designed air conditioning branch pipes and sockets that significantly reduce construction time and effort while improving construction quality; available in custom specifications for HVAC manufacturers.
• Air Conditioning Pipe Headers (空調機用パイプヘッダー) Custom-specification pipe headers combining design capability with high-quality manufacturing technology, supplied to air conditioning equipment manufacturers.
• Three-Way Bends (三方ベンド) Precision three-way bends manufactured using proprietary bulge forming technology for improved pressure resistance, easier brazing, and high quality.
• Brass Ball Valves (黄銅（真鍮）製ボールバルブ) Brass (true brass) ball valves with low fluid resistance that simplify on-site construction for piping systems.
• Copper Pipe Bending Products (銅管曲げ加工品) Custom-shaped copper pipe bending products produced with advanced bending technology capable of handling a wide range of irregular shapes.
• U-PIPE High-quality U-shaped pipe bending products developed through years of accumulated expertise in pipe bending.
• Aluminum Heat Sinks (アルミヒートシンク) Aluminum heat sinks with proposals tailored to application and size, sourced from both domestic and overseas materials.
• Brass and Stainless Precision Bodies (黄銅（真鍮）・ステンレスボディー) High-precision brass and stainless steel bodies produced through precision cutting processing technology for reliability-critical applications.
• Medical Aluminum Foil Plates (医療用アルミ箔プレート) Medical aluminum foil plates manufactured via high-precision thin-sheet press processing.
• Heat Exchangers (熱交換器) Heat exchangers designed and proposed to meet specific customer requirements.
• IGBT Insulated Circuit Boards (IGBT用絶縁回路基板) IGBT insulated circuit boards with SiN ceramic insulation, copper circuit and Ni plating, manufactured using vacuum thermal diffusion bonding to deliver high-strength bonding, high reliability, and void-free joints (copper circuit thickness ≥1mm).

Quantifiable outcome

• Dramatically reduces construction time and effort while improving construction quality

Named customers10 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

Feature5 records

Scale indicators4 records

Recent moves13 records

Expansion highlights4 records

Direct peers

• Sanhua Group: China-based manufacturer of HVAC and refrigeration components including valves, heat exchangers, and precision metal parts — directly comparable to Kakinuma's KBK branch pipes, ball valves, and headers serving Daikin, Mitsubishi Electric, and Carrier.
• Dowa Holdings: Japanese non-ferrous metals processor and recycler producing copper, aluminum, and precious metal materials — directly comparable trading + processing model focused on specialty non-ferrous metals in Japan and Asia.
• DunAn Environment: Chinese supplier of HVAC heat exchangers, valves, and pressure components to global AC OEMs — comparable business model as a precision metal components manufacturer focused on air conditioning and refrigeration markets.
• Modine Manufacturing: US-listed manufacturer of heat exchangers and thermal management components serving HVAC and industrial customers — comparable in heat exchanger production and custom precision metal component supply.
• ElringKlinger: German precision metal components manufacturer serving automotive and industrial applications — comparable in custom metal stamping, machining, and engineered component production for OEM customers.
• NORMA Group: German precision engineered metal components maker for HVAC, automotive, and industrial applications — comparable as a global supplier of custom precision metal joining and fluid-handling components.

Broad incumbents

• UACJ Corporation: Major Japanese aluminum sheet, plate, foil, and extruded products manufacturer — comparable as a large-scale supplier of aluminum materials for HVAC, automotive battery cases, and electronics applications.
• Mitsubishi Materials: Large Japanese non-ferrous metals manufacturer and trader covering copper, aluminum, and processed metal products — comparable as a major non-ferrous metals player in Japan with similar customer industries.
• Furukawa Electric: Japanese non-ferrous metals and materials conglomerate producing copper, aluminum, and specialty metal products — broader incumbent with overlapping product lines in copper tubes and aluminum materials for HVAC and electronics.
• Nippon Steel Corporation (non-ferrous / trading affiliates): Major Japanese metals conglomerate with non-ferrous and specialty metals trading operations — broader incumbent with overlapping metals trading and supply capabilities to industrial customers in Japan and Asia.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/kakinuma-kinzoku-seiki-co-ltd-

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries8 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 Kakinuma Kinzoku Seiki