What TPC does

三和トソー株式会社 (Sanwa Toso Corporation, doing business as TPC Corporation) is a Japanese contract manufacturer specializing in metal surface treatment, baking/powder coating, and related precision processing services. Founded in August 1952 by Hoshino Kinori and two partners and incorporated in November 1953, the company has operated continuously for over 70 years under Hoshino family leadership, with Tomohiko Hoshino serving as Representative Director since July 1984. Headquartered in Katsushika-ku, Tokyo with manufacturing concentrated at the ISO9001-certified Yoshikawa Factory in Saitama Prefecture (48 employees, 80 million yen registered capital), TPC delivers an integrated service stack spanning material procurement, shot blasting, impregnation, anodizing, screen printing, powder coating, robot painting, press and sheet metal processing, mold fabrication, resin molding, and final assembly.

The company's customer base centers on Japanese industrial manufacturers, with SMC Corporation (pneumatic equipment) and Itaya Seisakusho publicly named as major clients, alongside a horizontal segmentation strategy across manufacturing buyers requiring durable corrosion-resistant metal finishing. A distinct registered business line covering computer and software sales is also listed on the official company profile, though its current operating significance is unclear. Notable technical capability includes December 2013 mass-production achievement of chrome-free rust prevention treatment for non-ferrous metals, positioning TPC to serve customers facing tightening environmental regulation on hexavalent chromium.

TPC operates a direct-to-customer B2B model with no intermediaries, accepting inquiries by phone, fax, and email through the Yoshikawa Factory and serving customers across the Kanto region of Japan. The company holds ISO9001 certification (JQA-QMA10133, obtained June 2003), maintains relationships with Resona Bank, Kameari Shinkin Bank, and Shoko Chukin Bank, and presents a minimal digital footprint limited to its corporate website. Revenue, ownership structure, and financial performance are not publicly disclosed, and the business remains a private, family-controlled enterprise with no disclosed funding rounds, acquisitions, or external investors.

Name

TPC

Legal name

三和トソー株式会社

Website

https://tpc-sanwa.co.jp

Company type

Private

Founded year

1952

Operating status

Operating

Headcount range

11–50 employees

Short description

三和トソー株式会社 (TPC Corporation) is a Japanese contract manufacturer founded in 1952 that provides metal surface treatment, powder coating, anodizing, and precision processing services to industrial manufacturers in the Kanto region, with SMC Corporation as a named major customer.

Ownership category

akta.pro rank

Headquarters

HQ city

Aoto

HQ country

Japan

HQ region

Asia

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Surface Treatment and Coating Services: Core revenue from metal surface treatment, powder coating, painting, anodizing, and related processing services for industrial customers

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

TPC provides industrial metal surface treatment and coating services including metal baking/powder coating, FRP and plastic product coating, anodizing, impregnation treatment, screen printing, and shot blasting, complemented by precision processing capabilities such as press processing, sheet metal fabrication, mold processing, resin molding, and final assembly. The company also lists computer sales and software development among its registered business lines. Services are delivered as one-stop contract manufacturing from material procurement through finished assembly at its Tokyo headquarters and Saitama Yoshikawa factory.

Product overview

TPC (三和トソー株式会社) is a comprehensive metal surface treatment and painting services company offering a unified set of integrated manufacturing services. The company's core portfolio centers on metal surface treatment and painting (including baking/fusion coating for metal and FRP/plastic products), complemented by precision processing services including impregnation treatment, screen printing, anodizing, shot blast processing, press processing, sheet metal processing, mold processing, resin molding processing, and final assembly processing. The company operates manufacturing facilities equipped with automated pre-treatment systems, baking ovens, robot painting equipment, and anodizing lines to deliver finished products from raw materials through to completed assemblies.

Differentiator

Problem solved

Functional benefit

Products and services

• Metal Baking Coating (金属焼付塗装) Complete metal baking/fusion powder coating services for metal components, including pre-treatment and finishing for industrial parts.
• FRP and Plastic Product Coating (F・R・P及びプラスチック製品塗装) Surface coating services for Fiber Reinforced Plastic (FRP) and plastic product components.
• Impregnation Treatment (含浸処理) Impregnation treatment services applied to metal and other components for sealing and surface protection.
• Screen Printing (スクリーン印刷) Screen printing services using an SK350 curved printing machine for various product surfaces.
• Anodizing (アルマイト加工) Aluminum anodizing treatment services for corrosion resistance and surface hardening.
• Shot Blast Processing (ショットブラスト加工) Shot blast surface processing for cleaning and texturing metal surfaces prior to coating.
• Press Processing (プレス加工) Press metal forming and stamping services for industrial components.
• Sheet Metal Processing (板金加工) Sheet metal fabrication and processing services for industrial enclosures and components.
• Mold Processing (金型加工) Mold manufacturing and precision machining services.
• Resin Molding Processing (樹脂成型加工) Resin injection molding and forming services.
• Assembly Processing (組立加工) Final product assembly and integration services delivered alongside in-house surface treatment and processing.
• Computer Sales and Software Development (電算機販売及びソフトウェアー開発販売) Sale of computers and development and sale of software, listed as one of the company's registered business lines.
• Chrome-Free Rust Prevention Treatment for Non-Ferrous Metals (非鉄金属へのクロムフリー防錆処理) Mass-produced chrome-free rust prevention treatment for non-ferrous metals, an environmentally compliant alternative to traditional chrome-based coatings.

Quantifiable outcome

• ISO9001 quality management certification achieved June 2003
• +1 more outcomes

Named customers2 records

Segments2 records

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Five partnerships are on record, tiered core and minor.

• SMC株式会社 (SMC Corporation)coreOthersListed as a major customer of TPC, receiving metal surface treatment and coating services for their products.
• 株式会社板屋製作所 (Itaya Seisakusho)coreOthersListed as a customer of TPC, receiving metal surface treatment and coating services.
• りそな銀行 (Resona Bank)minorOthersListed as a transaction bank, providing financial services to TPC.
• 亀有信用金庫 (Kameari Shinkin Bank)minorOthersRegional credit union serving as a transaction bank for TPC.
• 商工組合中央金庫 (Shoko Chukin Bank)minorOthersSME-focused financial institution serving as a transaction bank for TPC.

Scale indicators5 records

Recent moves9 records

Expansion highlights3 records

Broad incumbents

• Nippon Parkerizing Co., Ltd. Japan's largest specialized metal surface treatment company, offering anti-corrosion coatings and chemical surface treatments to automotive and industrial OEMs. Comparable as a Japanese-headquartered metal surface treatment specialist serving industrial customers, though at far greater scale than TPC.
• Nihon Denshi Kogaku (NIDEC) Surface Treatment affiliates: Large Japanese industrial conglomerates with surface treatment operations serving electronics, automotive, and machinery OEMs. Comparable as Japanese industrial finishing capacity serving high-volume enterprise customers.
• Kansai Paint Co., Ltd. One of the largest paint and coatings manufacturers globally, with significant presence in industrial coatings. Comparable as an established Japanese industrial coatings player serving manufacturing customers, though operating at much larger scale and breadth than TPC.
• Dai Nippon Toryo Co., Ltd. Major Japanese coatings manufacturer supplying industrial paints and surface treatment chemicals. Comparable as a Japanese coatings/surface treatment player, though Dai Nippon Toryo is significantly larger and primarily a materials producer rather than an applicator.
• Aalberts Surface Technologies: European-headquartered provider of advanced surface treatment services for industrial components. Comparable as a dedicated metal finishing services business operating across multiple geographies, though at much larger scale than TPC.
• Sinto (Shinto) Co., Ltd. Japanese industrial equipment and surface treatment company supplying shot blasting, foundry equipment, and finishing solutions. Comparable as a Japanese-headquartered player in industrial surface finishing equipment and services.
• Atotech (Element Solutions): Global specialty chemicals and equipment supplier for surface finishing in electronics, automotive, and industrial markets. Comparable as a metal surface treatment provider, though primarily a chemistry supplier rather than a job-shop applicator.

Direct peers

• Bodycote plc: Global metal surface treatment specialist offering heat treatment, hot isostatic pressing, and surface technologies to industrial customers. Comparable as a dedicated metal finishing services provider with a similar job-shop model serving industrial OEMs.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

Compliance1 record

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 TPC