Daido Precision Industry Co.

What Daido Precision Industry Co. does

Daido Precision Industry Co., Ltd. (大同精密工業株式会社) is a privately held Japanese B2B precision parts manufacturer founded in 1933 and operating since July 2021 as a wholly owned subsidiary of Daido Steel Group. The company runs two business lines from its headquarters in Toshima-ku, Tokyo, with manufacturing concentrated at its Ranzan Plant in Saitama (opened April 1996) and a Kansai sales office in Osaka (opened October 2015). The Parts Business produces precision machined components — turbocharger wastegate and variable geometry components for gasoline and diesel engines, compressor suction/discharge valves for power plants and railway vehicles, disc springs (SUP10) for high-speed spindles and anti-seismic brake dampers, and precision magnets for fuel cell vehicle rotors — leveraging expertise in difficult-to-cut materials including heat-resistant steel, stainless steel, high alloys, pure titanium, titanium alloys, and hard brittle magnets. The Coupling Business designs and manufactures the FORMFLEX and TORSIFLEX metal plate spring (flexible disc) couplings, micro couplings (Japan's first, since 1977), and Stieber clutches, with FORMFLEX couplings rated for -20°C to 149°C operation and API 610/ISO13709 compliance (TORSIFLEX new orders suspended as of January 2026).

The company's revenue model is B2B hardware sales of custom-engineered components, supplemented by material proposal and consulting services integrated into the design engagement. Pricing is not publicly disclosed and is determined through direct technical sales engagement — the company engages customers from the design stage, proposing materials, processing methods, and cost-reduction solutions. Production is fully integrated in-house across cutting, grinding (rotating/centrifugal/vibratory barrel polishing, surface and double-head grinding, lapping to sub-micron tolerances), heat treatment (gas/ion nitriding, quenching, tempering, annealing, normalizing, solution treatment, aging), surface treatment (plating, chromizing), and assembly (TIG, plasma, fiber laser welding, riveting) with non-destructive inspection. The customer base spans automotive manufacturers and Tier 1 suppliers (primary), industrial machinery (compressors, power plants, factories, railway), construction/infrastructure (Obayashi Corporation's anti-seismic Brake Damper system), and broadly diversified coupling applications across semiconductors, paper mills, steel plants, and cooling towers.

As of April 2025 the company had 211 employees (down from 239 in July 2023), registered capital of ¥90 million, and quality certifications including ISO 9001 (1998), ISO 14001 (2004), ISO/TS 16949 (2017), and IATF 16949 (2018). Its technology edge is supported by a 1973 technical partnership with Formsprag Co. (Dana Inc., USA) and a 2014 partnership with TB Wood's (Altra Group), and it benefits from specialty material access through the Daido Steel Group's procurement network.

Name

Daido Precision Industry Co.

Legal name

大同精密工業株式会社

Website

https://daidoseimitu.co.jp

Company type

Private

Founded year

1933

Operating status

Operating

Headcount range

101–250 employees

Short description

Daido Precision Industry (大同精密工業株式会社) is a Japanese B2B manufacturer founded in 1933, wholly owned by Daido Steel Group since 2021, specializing in precision machining of difficult-to-cut materials and metal plate spring couplings, serving automotive, industrial machinery, construction, and energy customers through custom-engineered components and integrated production.

Ownership category

akta.pro rank

Headquarters

HQ city

Tokio

HQ country

Japan

HQ region

Asia

Offices3 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Precision Parts Manufacturing and Sales: Manufacture and sale of high-functional precision parts including turbocharger components for automobiles, compressor precision machined parts, and disc springs. Revenue is generated through direct B2B sales of custom-engineered components to automotive and industrial machinery manufacturers.
2. Coupling Design, Development, and Manufacturing: Design, development, and manufacture of power transmission devices including FORMFLEX couplings, micro couplings, TORSIFLEX couplings, and Stieber clutches. Products are sold directly to customers with custom engineering support.
3. Material Proposal and Consulting Services: Technical consulting and material proposal services as part of integrated production, helping customers select optimal materials for their applications, contributing to cost reduction and quality improvement.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

Daido Precision Industry manufactures and sells high-functional precision parts through a fully integrated in-house production system that covers material procurement, cutting, grinding, heat treatment, surface treatment, and final assembly. The company operates two business segments: a Parts Business producing turbocharger components, industrial compressor parts, precision disc springs, anti-seismic vibration control components, and precision magnet parts for fuel cell vehicles; and a Coupling Business producing FORMFLEX, micro, and TORSIFLEX metal plate spring power transmission couplings along with Stieber one-way clutches.

Product overview

Daido Precision Industry Co. operates two main business segments: Parts Business and Coupling Business. The Coupling Business includes FORMFLEX® Couplings (high-torque disc type), Micro Couplings (precision small-size), TORSIFLEX® Couplings (API-compliant industrial), and Stieber Clutches. The Parts Business encompasses industrial compressor parts, precision disc springs, anti-seismic system components, turbocharger parts, and magnet processing for fuel cells. The company offers integrated production from material selection through cutting, grinding, heat treatment, surface treatment, and assembly. Both businesses serve diverse industries including automotive, industrial machinery, semiconductors, robotics, construction, and energy.

Differentiator

Problem solved

Functional benefit

Brands

• FORMFLEX®カップリング: Metal plate spring type disc coupling known for no lubrication requirement, maintenance-free operation, and high torque transmission, designed and manufactured by Daido Precision Industry.
• マイクロカップリング
• TORSIFLEX®カップリング
• スティーバ・クラッチ (Stieber Clutch)

Products and services

• FORMFLEX® Coupling

Quantifiable outcome

• Compressor valve product lifespan extended from 4,000 hours to 8,000 hours through stainless steel material proposal and precision grinding
• +4 more outcomes

Named customers4 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Six partnerships are on record, tiered core, flagship and minor.

• TB Wood's Inc. (Altra Group, USA)coreTechnology or Integration · 1 October 2014Technical partnership established in October 2014 with TB Wood's Inc. (Altra Group) regarding TORSIFLEX coupling technology. This enabled domestic production of API standard-compliant TORSIFLEX couplings.
• Formsprag Co. (a division of Dana Inc., USA)coreTechnology or Integration · 1 November 1973Technical partnership established in November 1973 with Formsprag Co. (USA) regarding coupling technology. This partnership enabled Daido to introduce metal plate spring coupling technology to Japan, which became the foundation for the FORMFLEX coupling product line.
• Daido Steel Co., Ltd. (大同特殊鋼株式会社)flagshipStrategic or Co-development PartnerParent company and primary shareholder (with Daido Kogyo) providing material procurement support, access to rare materials, and metallurgical expertise. Daido Steel holds 42.4% stake and became 100% parent in July 2021 through share consolidation.
• Daido Kogyo Co., Ltd. (大同興業株式会社)flagshipStrategic or Co-development PartnerJoint shareholder alongside Daido Steel, contributing to the Daido Steel Group collaboration for material procurement and group-wide initiatives.
• Daido Steel Group CompaniescoreStrategic or Co-development PartnerNetwork of approximately 25 group companies across special steel materials, functional materials, auto parts, engineering, and distribution/service sectors enabling comprehensive solutions and access to specialized expertise.
• Partner Companies (協力会社)minorOthersExternal partner companies for specialized processing including fiber laser welding, various plating treatments, chromizing, and specialized nitriding services that complement in-house capabilities.

Scale indicators7 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• NSK Ltd. Major Japanese bearings and precision components manufacturer with broad automotive and industrial machinery exposure. Overlaps with Daido in turbocharger-related components, precision machined parts, and automotive Tier 1 supply, but at significantly larger scale.
• Mitsubishi Materials Corporation: Major Japanese materials and precision parts manufacturer with automotive components, cemented carbide tools, and high-alloy parts divisions. Comparable in precision machining of difficult materials and serving automotive OEM/Tier 1 supply chains.

Direct peers

• Nabtesco Corporation: Japanese manufacturer of precision equipment including motion control components and industrial couplings. Direct overlap with Daido's FORMFLEX disc coupling business and precision parts machining for industrial machinery, particularly in robotics and semiconductor equipment end markets.
• Mayr Power Transmission: German manufacturer of safety clutches, brakes, and torque limiters including disc-type couplings. Comparable to Daido's Stieber Clutch (overrunning/backstop clutches) and FORMFLEX offerings in industrial machinery and robotics applications.
• Tungaloy Corporation: Japanese manufacturer of cutting tools and wear-resistant components with expertise in difficult-to-machine materials. Direct peer in precision machining know-how for hard alloys and high-performance materials, serving overlapping automotive and industrial machinery customers.
• Rexnord Corporation: US-based manufacturer of power transmission products including disc couplings (Thomas Coupling Division), bearings, and gears. Direct peer for FORMFLEX-class disc couplings serving pumps, compressors, and industrial machinery.
• Altra Industrial Motion Corp. US-based power transmission specialist and parent of TB Wood's Inc., with whom Daido has a 2014 technical partnership for TORSIFLEX couplings. Overlaps directly in disc coupling technology, clutches, and industrial power transmission products for pumps, compressors, and machinery.
• Stieber (a Regal Rexnord brand): European-origin clutch manufacturer whose products Daido distributes in Japan under a technical partnership. Direct peer in overrunning, backstop, and indexing one-way clutches used in industrial machinery, conveyor systems, and machine tools.
• KTR Systems GmbH: German manufacturer of industrial couplings, torque limiters, and braking systems. Competes with FORMFLEX and TORSIFLEX couplings in industrial pump, compressor, and power transmission applications globally; strong in the European market where Daido has limited direct presence.

Emerging players

• Harmonic Drive Systems Inc. Japanese precision motion control specialist producing harmonic drive gears, servo actuators, and micro precision components. Comparable in serving robotics, semiconductor, and machine tool end markets where Daido's micro couplings and precision disc springs also compete.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Daido Precision Industry Co.