Taiyo Koki
Taiyo Koki (株式会社太陽工機) is a Japanese specialist manufacturer of precision grinding machines, founded in 1986 in Nagaoka, Japan. The company pioneered vertical grinding machines in 1989 and serves manufacturers across machinery, bearing, automotive, construction, marine, and energy industries. Now a wholly-owned subsidiary of DMG MORI.
- Company typePrivate
- Founded1986
- HeadquartersNagaoka, Japan
- Headcount251–500
- GTM typeB2B
- OfferingHardware or Manufacturing
What Taiyo Koki does
Taiyo Koki (株式会社太陽工機) is a Japanese specialist manufacturer of precision grinding machines, founded in 1986 and headquartered at 221番35 西陵町 (Nishisakaicho) in Nagaoka, Niigata Prefecture, Japan. The company pioneered the vertical grinding machine (立形研削盤) concept in 1989 and has built its identity around this category. Its product portfolio comprises three core lines: vertical grinding machines (Vertical Mate series including TKV 85, CVG series CVG-6/9/13, NVGH series NVGH-6T/9T, IGV series, and USG series), cylindrical grinding machines (円筒研削盤), and horizontal grinding machines (横形研削盤). The machines offer composite processing capability — internal, external, and angular surface grinding in a single setup — with guaranteed roundness precision of 1.0-2.0 μm depending on model. Notable engineering features include the speedMASTER LongNose grinding spindle (15.0-18.5kW, 9,000-10,000 min-1) co-developed with DMG MORI, optional APC (Auto Pallet Changer), DD motor for arbitrary shape grinding, and hard turning function for cycle time reduction.
The company's business model is B2B industrial machinery with one-time equipment sales as the primary revenue stream, complemented by aftermarket services including spare parts, maintenance, and tooling. Pricing is quote-based with no public disclosure. Distribution combines direct enterprise sales through a website inquiry system (requiring machine model and serial number) with the global distribution network of parent company DMG森精機株式会社 (DMG MORI) following its 2025 acquisition. The company serves manufacturers across multiple verticals: machinery, bearings, automotive drivetrain, construction machinery, marine/shipbuilding, and energy equipment. Marketing relies on major international trade shows (CIMT, EMO, MECT, JIMTOF, Grinding Technology Japan), biennial private exhibitions at the Nagaoka headquarters (700+ visitors in 2023), YouTube and Instagram channels, and IR activities. Following the DMG MORI tender offer completed in December 2024 and the subsequent stock swap, Taiyo Koki was delisted in February 2025 and now operates as a wholly-owned subsidiary within the DMG MORI group, continuing to manufacture and sell its grinding machine portfolio under the TAIYO KOKI brand.
Taiyo Koki firmographics
Firmographics- Name
- Taiyo Koki
- Legal name
- 株式会社太陽工機
- Website
- https://taiyokoki.com
- Company type
- Private
- Founded year
- 1986
- Operating status
- Acquired
- Headcount range
- 251–500 employees
- Short description
- Taiyo Koki (株式会社太陽工機) is a Japanese specialist manufacturer of precision grinding machines, founded in 1986 in Nagaoka, Japan. The company pioneered vertical grinding machines in 1989 and serves manufacturers across machinery, bearing, automotive, construction, marine, and energy industries. Now a wholly-owned subsidiary of DMG MORI.
- Ownership category
- akta.pro rank
Taiyo Koki industry classification
Industry- Product category
- Industrial Grinding Machines
- NAICS
- Machine Tool Manufacturing (333517), Metalworking Machinery Manufacturing (33351)
- SIC
- Machine Tools, Metal Cutting Types (3541), Metalworkg Machinery & Equipment (3540)
- akta.pro primary industry
- Grinding, Honing & Superfinishing Equipment (IMAHADAE)
- akta.pro secondary industries
- Motion & Machine Control (CNC, Robotics Controllers, Servo/Motion Controllers) (IMAGABAG), CNC Machine Tools (Turning, Milling, Machining Centers) (IMAHADAA)
Keywords
Where Taiyo Koki is headquartered
LocationHeadquarters
- HQ city
- Nagaoka
- HQ country
- Japan
- HQ region
- Asia
Offices1 record
Markets served
Taiyo Koki business model
Business model- GTM type
- B2B
- Offering type
- Hardware or Manufacturing
- Cost components
- Supply Chain, Operations, Personnel, Technology or R&D, Infrastructure, Marketing or Sales
Revenue model
- Industrial Grinding Machine Sales: One-time sales of precision grinding machines including vertical, cylindrical, and horizontal grinding machines. Revenue from machine sales, spare parts, service, and after-sales support.
- Aftermarket Services: Service support, spare parts, and maintenance services for installed base of grinding machines
Go-to-market motion1 record
Distribution channels3 records
Marketing channels6 records
Taiyo Koki product offering
Product offeringCore offering
Taiyo Koki designs, manufactures, and sells precision grinding machines — primarily vertical grinding machines (立形研削盤), along with cylindrical and horizontal grinding machines. Its vertical compound grinding machines enable internal, external, and angular surface grinding in a single setup for industrial components used in bearings, automotive drivetrains, machine tools, hydraulic cylinders, and energy equipment. The company also provides tooling, automation, and process-innovation support as a total grinding solution for industrial manufacturers.
Product overview
Taiyo Koki is a specialist manufacturer of precision grinding machines, founded in 1986 and headquartered in Nagaoka, Niigata Prefecture, Japan. The company pioneered the vertical grinding machine concept in 1989 and has grown into a leading supplier of grinding solutions. Its product portfolio includes three main categories: vertical grinding machines (立形研削盤), cylindrical grinding machines (円筒研削盤), and horizontal grinding machines (横形研削盤). The vertical grinding machine line encompasses multiple series including the CVG series (CVG-6, CVG-9, CVG-13) for standard applications, the NVGH series (NVGH-6T, NVGH-9T) for high-rigidity/high-power requirements, and the Vertical Mate series (including TKV 85) for general-purpose cost-effective solutions. The company became a subsidiary of DMG森精機 (DMG MORI) in 2025.
Differentiator
Problem solved
Functional benefit
Brands
- Vertical Mate: Vertical compound grinding machine series - including models like TKV 85, Vertical Mate 55, Vertical Mate 125
- CVG Series
- NVGH Series
- IGV Series
- USG Series
Products and services
- CVG-6 Medium-sized vertical compound grinding machine with ø650mm swing and 500kg maximum payload. Features composite processing for internal and external grinding with a standard turret structure for medium-workpiece manufacturers.
- CVG-9 Medium-to-large vertical compound grinding machine with ø950mm swing and 2,500kg maximum payload. Handles grinding diameters from ø50mm to ø900mm for medium-large workpieces.
- CVG-13 Large vertical compound grinding machine with ø1,350mm swing and 3,000kg maximum payload. Features dual spindle specification with turret structure for high-precision internal, external, and face grinding of large components.
- NVGH-6T High-rigidity, high-power vertical compound grinding machine with high-precision indexing turret table for tapered crowning加工. Designed for demanding high-precision grinding of medium workpieces.
- NVGH-9T High-rigidity, high-power vertical compound grinding machine for large workpieces such as energy equipment and bearings. Features HSK-A125 specification and a 25kW built-in motor for heavy-duty mass production grinding.
- Vertical Mate 125 General-purpose vertical compound grinding machine maintaining composite processing capability and precision with high cost performance. Features 1,250mm swing diameter and 2,500kg table load capacity for cost-effective mid-large workpiece grinding.
- TKV 85 (Vertical Mate 85) Second-generation vertical compound grinding machine developed jointly with DMG森精機 (DMG MORI). Features ø850mm swing, 700kg payload capacity, and the speedMASTER LongNose grinding spindle with class-leading 18.5kW power and 10,000min-1 rotation speed. Roundness guaranteed at 1.0μm.
- Vertical Grinding Machines (立形研削盤) Taiyo Koki's founding product category and core expertise. The vertical grinding machine line encompasses the Vertical Mate, CVG, and NVGH series and continues to evolve since its 1989 launch.
- Cylindrical Grinding Machines (円筒研削盤) Cylindrical grinding machines for external cylindrical grinding applications in industrial manufacturing.
- Horizontal Grinding Machines (横形研削盤) Horizontal grinding machines for various industrial grinding applications.
- Aftermarket Services & Spare Parts Service support, spare parts supply, and maintenance services for the installed base of Taiyo Koki grinding machines.
Quantifiable outcome
- Roundness guaranteed at 1.0μm for high-precision models (TKV 85, NVGH series)
- +2 more outcomes
Companies that use Taiyo Koki
Customer profileSegments6 records
Ideal customer profiles2 records
Taiyo Koki technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature7 records
Taiyo Koki partnerships and signals
Strategic signalPartnerships
Five partnerships are on record, tiered flagship, core and minor.
- DMG森精機株式会社 (DMG MORI)flagshipDMG森精機 acquired Taiyo Koki through tender offer in late 2024/early 2025. Taiyo Koki became a wholly-owned subsidiary and was delisted in February 2025. DMG MORI and Taiyo Koki co-develop products like the TKV 85 with speedMASTER LongNose grinding spindle. DMG MORI distributes Taiyo Koki products through its global network and exhibits Taiyo Koki machines at international exhibitions like EMO.
- 株式会社マグネスケール (Magunescale)coreMagunescale co-exhibited at Taiyo Koki Private Show 2023 as a sponsor, demonstrating the ecosystem partnership within the manufacturing solutions network.
- 倉敷機械株式会社 (Kurashiki Machinery)minorCoordinated shuttle bus service with Kurashiki Machinery during Private Show 2023, as both companies held open houses at the same time in Niigata region.
- Phoenix Robots (学生ロボットチーム)minorDiamond sponsor of student robot team Phoenix Robots based in Nagaoka. Supports the team's participation in RoboMaster international robotics competition. Part of local community engagement and talent development initiatives.
- 新潟アルビレックスBB (Niigata Albirex BB)minorArena partner sponsorship with professional basketball team Niigata Albirex BB. Engages in community activities including basketball workshops for local youth sports teams. Part of regional community engagement and sports promotion activities.
Scale indicators2 records
Recent moves7 records
Expansion highlights5 records
Taiyo Koki competitors and assessment
Company assessmentBroad incumbents
- Makino Milling Machine: Japanese machine tool builder specializing in horizontal machining centers and EDM, with adjacent precision grinding capabilities. Comparable Japanese machine tool specialist serving aerospace and automotive customers with similar direct sales and trade show marketing approach.
- DMG MORI: Parent company of Taiyo Koki and one of the world's largest machine tool manufacturers offering milling, turning, and additive solutions. Relevant both as the new owner and as a broader incumbent whose machine portfolio increasingly competes with specialty grinding machines.
- JTEKT (Toyoda brand): Major Japanese automotive components and machine tool manufacturer offering Toyoda-branded grinding machines (cylindrical, cam, vertical). Comparable product overlap (especially in vertical grinding and automotive bearing/machinery applications) but operates as a much larger diversified group.
Direct peers
- United Grinding Group: Swiss-headquartered parent of Studer, Walter, and Schaudt, among others, and one of the world's largest manufacturers of precision grinding machines. Direct competitor in cylindrical, surface, and tool grinding with overlapping customer base in automotive, bearings, and general machinery.
- Okamoto Corporation: Japanese manufacturer specializing in surface grinders, internal/external cylindrical grinders, and creep feed grinders. Closely comparable as a Japan-based grinding machine specialist serving automotive and bearing industries with similar quote-based B2B sales motion.
- JUNKER (Erwin Junker Machinery): German manufacturer of high-precision grinding machines for tools, blades, and cylindrical components. Comparable as a family-owned specialty grinding machine builder with deep vertical integration.
- ANCA: Australia-based specialist manufacturer of CNC tool and cutter grinders, competing in precision grinding with similar customer focus on tooling manufacturers. Comparable as a privately-held, category-dedicated grinding machine specialist with global distribution.
- Danobat (Danobatgroup): Spanish manufacturer of grinding machines and turning/milling solutions, particularly strong in large-format grinding for railway, energy, and heavy machinery sectors. Directly comparable product range and end-market focus.
Regional players
- Nagase Integrex / Mitsui Seiki: Japanese manufacturers of ultra-precision and hybrid turn-mill-grind machines that increasingly encroach on dedicated grinding applications. Relevant peer as Japan-based machine tool competitors addressing similar automotive and bearing grinding use cases.
Emerging players
- KMT Precision Grinding (Kapp Technologies): European precision grinding technology specialist focused on gear and profile grinding machines. Compares as a niche precision grinding specialist with similar end-market exposure to automotive drivetrain and bearing manufacturers.
Market position
Strengths4 records
Weaknesses4 records
Competitive moat4 records
Key risks5 records
Key highlights6 records
Customer concentration
Taiyo Koki social profiles
Digital presenceTaiyo Koki financial estimates
Financial estimateRevenue estimate
Valuation estimate
Taiyo Koki leadership team
Management profileNumber of profiles
Profiles1 record
Taiyo Koki funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Taiyo Koki M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Taiyo Koki
What does Taiyo Koki do?
Taiyo Koki designs, manufactures, and sells precision grinding machines — primarily vertical grinding machines (立形研削盤), along with cylindrical and horizontal grinding machines. Its vertical compound grinding machines enable internal, external, and angular surface grinding in a single setup for industrial components used in bearings, automotive drivetrains, machine tools, hydraulic cylinders, and energy equipment. The company also provides tooling, automation, and process-innovation support as a total grinding solution for industrial manufacturers.
Is Taiyo Koki a public or private company?
Taiyo Koki is a private company. It is classified as corporate owned and is currently acquired.
When was Taiyo Koki founded?
Taiyo Koki was founded in 1986. It employs 251 to 500 people.
Where is Taiyo Koki based?
Taiyo Koki is headquartered in Nagaoka, Japan, in the Asia region.
How does Taiyo Koki make money?
Two revenue lines are on record. Industrial Grinding Machine Sales are the primary driver. The others are aftermarket Services.
Who are Taiyo Koki's main competitors?
Broad incumbents on record are Makino Milling Machine, DMG MORI and JTEKT (Toyoda brand). Direct peers are United Grinding Group, Okamoto Corporation, JUNKER (Erwin Junker Machinery), ANCA and Danobat (Danobatgroup). Nagase Integrex / Mitsui Seiki is listed as a regional player. KMT Precision Grinding (Kapp Technologies) is listed as an emerging player.
Does Taiyo Koki have an API?
No public API is recorded for Taiyo Koki.
What industry is Taiyo Koki in?
Taiyo Koki's product category is Industrial Grinding Machines. Its primary akta.pro industry code is IMAHADAE, Grinding, Honing & Superfinishing Equipment, with a secondary code of IMAGABAG, Motion & Machine Control (CNC, Robotics Controllers, Servo/Motion Controllers). Its NAICS code is 333517 and its SIC code is 3541.