Tokki

What Tokki does

Tokki Co., Ltd. (徳機株式会社) is a privately held Japanese industrial manufacturer founded in 1934 and headquartered in Shunan City, Yamaguchi Prefecture, specializing in custom pressure vessels, head plates, steel structures and platforms, and resin pellet cutting/sorting machines. The company operates through four product divisions — Process Equipment, Head Plate, Structure & Platform, and Eco Division — serving petroleum refining, petrochemical, chemical, power generation, pharmaceutical, and shipbuilding customers domestically and internationally. Tokki maintains an in-house integrated production system covering design, fabrication, on-site installation, instrumentation, piping, and maintenance, supported by group companies for steel cutting, structural fabrication, and construction services.

The company's core technology is grounded in welding, forming, heat treatment, and testing of pressure-bearing equipment, anchored by capital-intensive assets including 7,000-ton and 4,000-ton presses, a VFM-5 spinning machine capable of 5M diameter and 80mm thickness, multiple large heat treatment furnaces, and comprehensive inspection equipment. Tokki is one of only a few Japanese manufacturers capable of producing approximately 400-ton capacity vessels. Its proprietary 9% nickel steel head plate for marine LNG fuel tanks is Japan's first domestic application of this cryogenic material, supported by ship classification society welding certification obtained in 2021 and over 10 in-house certified welders. The company holds ASME U/S/U2 stamps (since 1978), ISO 9001 (2000), and ISO 14001 (2008), alongside Chinese Special Equipment, Japan Marine Association, and National Board certifications.

Tokki operates as a B2B enterprise with direct field sales, generated through specialized sales divisions for each product line plus a Yokohama branch for the Kanto region. Revenue is generated via one-time, made-to-order project sales of custom equipment, with pricing on a quote basis and no publicly disclosed pricing. The company is family-led (Okada family representation on the board) with 220 employees standalone and 866 across the group, which includes wholly-owned subsidiaries in the USA (TOKKI KK, INC., Irvine, California, est. 1990) and Indonesia (PT. TOKKI ENGINEERING AND FABRICATION, est. 2019, with three factories in Cikarang, Cilegon, and Gresik). The group is targeting a 100-year milestone (founded 1934) and is actively diversifying into energy transition applications including SAF, blue hydrogen, and blue ammonia equipment.

Name

Tokki

Legal name

徳機株式会社（TOKKI Co.,Ltd.）

Website

https://tokkiltd.co.jp

Company type

Private

Founded year

1934

Operating status

Operating

Headcount range

101–250 employees

Short description

Tokki is a privately held Japanese manufacturer (founded 1934) of custom pressure vessels, head plates, steel structures, and resin pellet cutting machines. It serves petroleum, petrochemical, power, pharmaceutical, and shipbuilding customers domestically and across the USA, Indonesia, and Asia.

Ownership category

akta.pro rank

Product category

Industrial Pressure Vessels and Plant Equipment Manufacturing

NAICS

Boiler, Tank, and Shipping Container Manufacturing (3324), Other Metal Valve and Pipe Fitting Manufacturing (332919)

SIC

Fabricated Plate Work (Boiler Shops) (3443)

akta.pro primary industry

Pressure Vessels, Columns & Storage Tanks (ASME/Process Vessels) (IMAHAEAF)

akta.pro secondary industry

Industrial/Process Piping & Mechanical Contracting (IMAFALAG)

Keywords

• Industrial pressure vessels
• Head plates manufacturing
• Plant equipment fabrication
• Steel structure platforms
• Resin pellet cutting machines

Headquarters

HQ city

Yamaguchi

HQ country

Japan

HQ region

Asia

Offices11 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Pressure Vessel Manufacturing: Custom-manufactured pressure vessels including columns, drums, heat exchangers, boilers, and reactors for petroleum refining, chemical, power generation, and pharmaceutical industries. Products are made-to-order based on customer specifications.
2. Head Plate Manufacturing: Custom head plates including hemispherical, ellipsoidal, half shell, and conical types. Produced in various materials including carbon steel, stainless steel, and special alloys like 9% nickel steel.
3. Structure and Platform Manufacturing: Custom structural steel and platform manufacturing for industrial plant applications.
4. Construction and Installation Services: On-site construction, installation, instrumentation, piping, and maintenance services for plant equipment. Includes large-scale special construction, equipment installation, and maintenance.
5. Resin Pellet Cutting and Sorting Machines: Manufacturing and sales of resin pellet cutting and sorting machines through the Eco Division.

Pricing tiers

Go-to-market motion1 record

Distribution channels7 records

Marketing channels6 records

Core offering

Tokki designs, manufactures and installs custom industrial pressure vessels — including columns, drums, heat exchangers, boilers and reactors — together with head plates, structural platforms, and related plant equipment for petroleum refining, petrochemical, power generation, pharmaceutical, chemical and shipbuilding customers. The company also produces resin pellet cutting and sorting machines through its Eco Division and provides one-stop service spanning design, fabrication, on-site construction, instrumentation, piping and maintenance.

Product overview

Tokki (徳機株式会社) is a plant equipment manufacturer offering four core product lines: pressure vessels (塔, 槽, 熱交換器&ボイラ, 反応器), head plates (半球型, 半楕円型, 半割胴, 円錐胴), structures & platforms, and resin pellet cutting & sorting machines. The company operates under an integrated manufacturing system from design through fabrication to on-site installation, serving petroleum refining, petrochemical, power generation, pharmaceutical, and general chemical industries. Approximately 400-ton capacity vessels can be manufactured, placing Tokki among the few domestic manufacturers capable of producing mega-scale equipment.

Differentiator

Problem solved

Functional benefit

Products and services

• Pressure Vessels (圧力容器関連) Custom pressure vessels designed to store gases or liquids under controlled pressure, used in petroleum refining, petrochemical, pharmaceutical, and power generation applications. Includes towers/columns, drums, heat exchangers, boilers, and reactors. Tokki can manufacture vessels up to approximately 400-ton capacity, placing it among the few domestic manufacturers capable of mega-scale equipment.
• Head Plates (鏡板関連) Semi-spherical or elliptical plates that seal the ends of cylindrical pressure vessels, used in petroleum refining and general chemical plants. Product types include hemispherical, semi-ellipsoidal, half-shell, and conical configurations. Includes Japan's first domestically developed 9% nickel steel head plate for marine LNG fuel tank applications, with over 10 ship classification society certified welders.
• Structures & Platforms (ストラクチャー＆プラットフォーム) Custom structural steel and platform systems for industrial plant installations, fabricated at the Iwaki factory and by group company Tokki Seisakusho. Produced under an integrated manufacturing system delivering consistent quality and precise fit with plant equipment.
• Resin Pellet Cutting and Sorting Machines (樹脂ペレット切断機・選別機) Cutting and sorting equipment for resin pellets, manufactured by Tokki's Eco Division (徳機エコ事業部) and sold through tokkieco.jp. Used in plastics recycling and resin processing applications.
• Freedom Seat Sit-Stand Rehabilitation Assistance Vehicle (起立着座リハビリ支援車「自由自座位」) A registered sit-stand rehabilitation assistance vehicle product developed by Tokki, registered with the Techno Aids Association under TAIS code 02075-000001, designed to assist users with standing and sitting movements.

Quantifiable outcome

• Japan's first domestic 9% nickel steel head plate for marine LNG fuel tanks
• +4 more outcomes

Named customers3 records

Segments5 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

Nine partnerships are on record, tiered core, regional and minor.

• PT. TOKKI ENGINEERING AND FABRICATION (TEF)coreOthers · 8 May 2025Indonesian subsidiary established in April 2019 with facilities in Cikarang (main office & factory), Cilegon (2nd office & factory), and Gresik (Voyager - 3rd facility opened April 2024). The Gresik facility marks TEF's first expansion into East Java. Group company providing manufacturing, engineering, and fabrication services in Southeast Asia.
• 徳機工事株式会社 (Tokki Koji Corporation)coreStrategic or Co-development PartnerGroup company established 1973 handling plant equipment design, fabrication, on-site installation, instrumentation, piping, and maintenance. Headquartered in Shunan City with multiple offices in Yamaguchi Prefecture. 400 employees plus 300 temporary workers. Jointly undertakes large-scale construction projects with Tokki Co., Ltd.
• 新山陽剪断株式会社 (Shinyamanaka Ssansatsu Co., Ltd.)coreStrategic or Co-development PartnerGroup company specializing in steel plate cutting and processing. Established 1963, located in Shunan City. 35 employees. Provides steel plate cutting services essential for Tokki's pressure vessel manufacturing process.
• 株式会社徳機製作所 (Tokki Seisakusho Corporation)coreStrategic or Co-development PartnerGroup company specializing in steel structure fabrication, pipe bending, and steel bending. Established 1968 with facilities in Shunan City. 60 employees (41 steel structure division, 19 bender division). Completed new factory for primary processing line in April 2025. Provides structural components for Tokki's plant equipment.
• PT. TOKKI ENGINEERING AND FABRICATION - Chikuran/Ciregon PlantscoreStrategic or Co-development PartnerManufacturing facilities in Cikarang Industrial Estate (West Java) and Krakatau Industrial Estate (Cilegon, Banten). PIPINTI facility (2nd factory, July 2022) expanded piping and equipment capabilities. PINISI facility (July 2024) expanded radiant tube production.
• TOKKI KK, INC. (USA)regionalOthersUS subsidiary established February 1990 serving North American market from Irvine, California. Handles sales and support for Tokki products in the US market.
• 毎日興業株式会社 (Mainichi Kogyo Co., Ltd.)minorOthersGroup company operating movie theaters, tenant building management, and leisure facilities. Part of Tokki Group diversification beyond core manufacturing.
• 山口きらら博記念公園水泳プール (Yamaguchi Kirara Memorial Park Swimming Pool)minorGTM or Marketing PartnerTokki became naming rights partner for the swimming pool facility located in Yamaguchi City. Partnership supports regional sports promotion and community vitality. Announced December 2025.
• 周南公立大学 (Shunan Public University)minorGTM or Marketing PartnerTokki sponsored the introduction of cleaning robots at Shunan Public University, supporting educational institution and demonstrating corporate social responsibility.

Scale indicators12 records

Recent moves11 records

Expansion highlights6 records

Market position

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/tokkiltd
• Instagraminstagram.com/tokki_631234

Compliance11 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

Subsidiaries12 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 Tokki