What Diamet does

Diamet Corporation is a Japan-based powder metallurgy manufacturer that has produced sintered components since 1944. The company's product portfolio centers on three core categories: oil-impregnated sintered bearings (self-lubricating bearings for motors and mechanical systems), sintered machine parts (engine, transmission, and chassis components for automotive applications), and soft magnetic materials (including the proprietary MBS powder magnetic core material for power electronics and motor applications). Its manufacturing process relies on in-house-designed high-precision dies and proprietary forming/sintering techniques, with documented 15-20% cost advantages versus sheet metal or forging alternatives and the ability to produce near-net-shape parts that eliminate downstream machining. Diamet sells directly to global automotive OEMs and Tier 1 suppliers through a field sales organization with regional offices in Japan (Atsugi, Anjo, Himeji) and wholly-owned manufacturing subsidiaries in China (Foshan, est. 2009), Malaysia (Port Klang, est. 1993), and India (Gurugram, est. 2024, opening June 2026).

The business model is B2B hardware sales of customized, specification-driven sintered components, priced via quote-based, multi-year supply contracts. Revenue is generated through long-term direct relationships with the world's top automobile manufacturers, supported by technical sales engineers and a sales support department. Group revenue for FY March 2025 was 17,594 million JPY (approximately $115-120M USD), with ordinary income of only 154 million JPY (roughly 0.87% margin), indicating thin profitability typical of automotive Tier 1 component supply. The company is wholly owned by MEPRO HOLDINGS Co., Ltd. (a holding company established in 2023, previously under Mitsubishi Materials Corporation) and is pursuing a strategic expansion into power electronics with its patented TriMagiC Converter technology and xEV soft magnetic materials, in addition to its core automotive business. The company has received over 20 Japan Powder Metallurgy Association awards between 2011-2020 and holds ISO 9001:2015 and ISO 14001:2015 certifications.

Name

Diamet

Legal name

株式会社ダイヤメット

Website

https://diamet.co.jp

Company type

Private

Founded year

1944

Operating status

Operating

Headcount range

501–1,000 employees

Short description

Diamet Corporation is a Japan-based powder metallurgy manufacturer founded in 1944 that produces oil-impregnated sintered bearings, sintered machine parts, and soft magnetic materials for global automotive OEMs and Tier 1 suppliers through a four-country manufacturing network.

Ownership category

akta.pro rank

Headquarters

HQ city

Niigata

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, Infrastructure, Marketing or Sales

Revenue model

1. Sale of powder metallurgy products (sintered bearings, machine parts, soft magnetic materials): Manufactures and sells sintered components — primarily oil-impregnated sintered bearings and sintered machine parts — to global automobile manufacturers. Revenue is generated through long-term supply relationships with major automotive OEMs. Products are sold directly through the company's field sales organization.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

Diamet Corporation manufactures and sells powder metallurgy (sintered) products — primarily oil-impregnated sintered bearings, sintered machine parts (engine, transmission, sprocket, oil pump rotor components), and soft magnetic materials (sintered cores and powder magnetic cores). Its products are sold to global automotive OEMs and Tier 1 suppliers, with additional sales into industrial motor, household appliance, and EV power-electronics applications. Diamet also develops the proprietary TriMagiC Converter™ isolated DC-DC converter circuit topology built on its MBS™ magnetic material.

Product overview

Diamet offers a portfolio of powder metallurgy-based sintered products comprising four main categories: Oil-Impregnated Sintered Bearings (self-lubricating bearings for motors and automotive applications), Sintered Machine Parts (engine components, transmission parts, sensors, sprockets, and oil pump rotors including IPR® rotors), Soft Magnetic Materials (sintered magnetic materials and MBS™ powder magnetic cores for motors and inductors), and the proprietary TriMagiC Converter™ technology for DC-DC converter applications. The company leverages advanced powder metallurgy manufacturing technology enabling high precision and production efficiency for automobile manufacturers globally.

Differentiator

Problem solved

Functional benefit

Products and services

• Oil-Impregnated Sintered Bearings / Sintered Bearings High-precision, high-quality, high-performance sintered bearings and oil-impregnated sintered bearings manufactured using proprietary powder metallurgy technology and self-manufactured high-precision die assemblies. Features self-lubricating function through oil impregnation in pores; used by global automotive manufacturers in motors, fuel pumps, and other components.
• Sintered Machine Parts
• Soft Magnetic Materials (Sintered Soft Magnetic Materials & MBS™ Powder Magnetic Cores) Sintered soft magnetic materials for low-frequency applications and MBS™ powder magnetic cores for high-frequency applications. Features complex near-net shapes, high electrical resistance, and low iron loss. Used in motor stators, reactors, transformers, DC-DC converters, boost reactors, axial gap motors, and other high-frequency power-electronics applications for xEVs.
• TriMagiC Converter™ (Isolated DC-DC Converter Circuit Topology) Proprietary isolated DC-DC converter circuit topology using MBS™ magnetic material that achieves significant miniaturization (magnetic component size reduced to approximately 1/3) and high conversion efficiency (97% achieved in a 150 kHz prototype) through ON-ON & ON-OFF operating modes with ZVS. Targeted at data center, server, and EV power supply applications.

Quantifiable outcome

• Pin density of 7.4 g/cm³ achieved through sintering-only process (vs. requiring sinter-forging for conventional methods)
• +7 more outcomes

Named customers1 record

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature8 records

Partnerships

Five partnerships are on record, tiered core and minor.

• Nagoya University — Yamamoto Laboratory, Future Materials and Systems Research InstitutecoreStrategic or Co-development Partner · 1 July 2025Joint research collaboration on PoL (Point of Load) converters using TriMagiC Converter (TMC) technology, announced July 2025. The goal is to integrate two main transformers into one for more compact PoL converters for data center and server power supplies. Research combines electrical and magnetic circuit coupled simulation for design methodology. Results presented at the 2026 Electrical Engineering Society National Conference. Joint research began July 2024.
• Guangdong Diamet Powder Metallurgy Co., Ltd. (広東達宜明粉末冶金有限公司)coreOthersConsolidated subsidiary in Foshan, Guangdong Province, China. Established 2009. Part of the group's global production network for powder metallurgy components serving the Asian market.
• Diamet Klang (Malaysia) Sdn., Bhd.coreOthersConsolidated subsidiary in Port Klang, Malaysia. Established 1993. Part of the group's global production network. Subject of a cybersecurity incident (unauthorized server access) reported in July 2022; the incident was contained with no impact on other locations.
• DIAMET SINTERED METAL INDIA Pvt. Ltd.coreOthersNewest consolidated subsidiary in Gurugram, Haryana, India. Established 2024. Factory opening ceremony held June 1, 2026. New manufacturing base to serve the Indian automotive market and strengthen the global production and supply network.
• Japan Powder Metallurgy Association (JPMA) / Japan Society of Powder and Powder Metallurgy (JSPM)minorOthersDiamet is an active member of JPMA and JSPM. JPMA promotes the sound development of the powder metallurgy industry. JSPM is a learned society supporting scientific and technological inquiry and innovation in powder and powder metallurgy. Diamet has received multiple JPMA awards (2011-2020).

Scale indicators8 records

Recent moves8 records

Expansion highlights6 records

Broad incumbents

• Carpenter Technology Corporation: US specialty alloys and powder metallurgy materials producer with capabilities in soft magnetic alloys and metal powders for power electronics and automotive applications. Adjacent competitor in soft magnetic materials relevant to Diamet's MBS product line.
• Mitsubishi Materials Corporation: Former parent of Diamet (until 2023) with its own powder metallurgy operations and broader portfolio across metals, cement, and advanced materials. Historical knowledge of Diamet's operations creates both customer/competitor overlap and legacy governance linkage.
• Sumitomo Electric Industries: Large Japanese diversified materials and components manufacturer with a significant powder metallurgy division producing sintered parts for automotive and industrial markets. Larger scale and broader portfolio than Diamet, but overlapping in PM auto components.
• Proterial (formerly Hitachi Metals): Japanese specialty materials manufacturer producing soft magnetic materials, electrical steel, and powder metallurgy components. Overlaps with Diamet on soft magnetic cores and magnetic materials for power electronics and EV motors.

Direct peers

• ASCO Sintering: US-based powder metallurgy parts manufacturer producing sintered bearings, gears, and structural components for automotive, industrial, and consumer markets. Direct competitor in custom sintered components with comparable customer base in automotive.
• MIBA AG: Austrian powder metallurgy specialist producing sintered bearings, structural parts, and friction materials primarily for automotive OEMs globally. Comparable product categories, customer base, and process technology to Diamet's core sintered bearings and machine parts lines.
• Porite Corporation: Japanese powder metallurgy manufacturer producing oil-impregnated sintered bearings, sintered machine structural parts, and soft magnetic materials for automotive and industrial markets. Closest direct competitor to Diamet in Japan, with comparable product mix, OEM customer base, and process technology.
• AMES Group (AME Sintered Components): Spanish PM parts manufacturer with global production footprint producing sintered components for automotive OEMs. Direct competitor in automotive sintered parts with comparable technology base and customer overlap.
• Stackpole International: Canadian-headquartered powder metallurgy supplier producing sintered components for automotive transmission, engine, and chassis applications for global OEMs. Direct competitor in PM automotive components with similar technology and customer focus as Diamet.

Others

• Höganäs AB: Swedish company and world's largest producer of iron and metal powders for powder metallurgy. Not a direct competitor but the dominant raw material supplier to the PM industry, including to producers like Diamet; strategically critical to industry cost structure.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks5 records

Key highlights7 records

Customer concentration

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 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 Diamet