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  1. Home
  2. Building materials, supplies and fixtures
  3. ダイコー 本社
Building materials, supplies and fixtures
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ダイコー 本社

EstablishmentJune 1984
capital1000Ten thousand
number of employees80
addressOsaka/Nishinari-ku, Osaka-shi/Nanjin Guard 4-4-12
phone06-6657-0374
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last updated:Dec 02, 2025
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  • Products/Services(534)
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ダイコー Company Overview

Leave it to us for gaskets, packing, and industrial products! We cut various materials with a water jet (high-pressure water cutting)!

Daiko is a manufacturer specialized in processing various industrial products, including gaskets and packing. With industry-leading processing equipment, including one of Japan's largest water jet cutting machines, and a wide range of materials such as joint sheets, rubber, resin, and metal, we meet our customers' diverse needs. Leveraging the technology and experience we have cultivated over 50 years, we provide high-quality, short-lead-time, and low-cost products to contribute to solving our customers' challenges. To respond to our customers' varied needs, Daiko's production bases are equipped with various processing facilities. Among them, the water jet cutting machines, with a total of four installed at our Osaka headquarters and Tokyo branch, boast one of the largest scales in the country. The maximum processing range is W4,000 × L5,500 mm, allowing for the high-precision manufacturing of large-diameter gaskets and packing. By maximizing material efficiency, we achieve the provision of 'high quality at low cost.'

Business Activities

Manufacturing and sales of gaskets, packing, and industrial products. ■Products - Gaskets for general fluids - Gaskets for high pressure and high temperature - Exhaust system gaskets - Expanded graphite gaskets - Seal gaskets for valves and pumps - Gaskets for boilers and water gauge cocks - Insulating bolts, insulating sleeves, insulating washers - Rubber and sponge-related products - Resin materials ■Handling Manufacturers - Nichias Corporation - Iruma River Rubber Co., Ltd. - Japan Valqua Ltd. - Mitsubishi Chemical Corporation - Tiger Polymer Corporation In addition to major gasket manufacturers such as Nichias and Valqua, we offer a lineup of products from various manufacturers including rubber, metal, and resin. We can also propose our own brand products that offer advantages in terms of delivery time and cost. Please feel free to consult with us.

Recommended information

What is RCF regulation? A basic guide from asbestos to RCF and then to AES.

What is RCF regulation? A basic guide from asbestos to RCF and then to AES.

We will explain the transition to the safe alternative AES (biodegradable fibers) and its background!

In November 2015, a significant regulation that overturned the conventional wisdom of high-temperature insulation in Japan's industrial sector was enacted. This is the "RCF Regulation (Revised Labor Safety and Health Act)." RCF (Refractory Ceramic Fiber), which once dominated as a substitute for asbestos, has become a legally regulated substance due to concerns about its carcinogenicity. As a result, the selection of sealing and insulation materials in high-temperature areas exceeding 1000°C now faces new challenges. This article will thoroughly explain the fundamental question of "What is the RCF Regulation?" as well as why RCF is regulated and why AES has been chosen as its alternative, while unraveling the history of insulation materials. *For detailed content of the column, please refer to the PDF. For more information, feel free to contact us.*

Products/Services (534)

Support for complex internal shapes using water jet processing. product image
Support for complex internal shapes using water jet processing.
Supports irregular and multi-hole processing with water jet machining. product image
Supports irregular and multi-hole processing with water jet machining.
Supports mass production and high-precision hole processing through press processing. product image
Supports mass production and high-precision hole processing through press processing.
【For Chemical Plants】Spiral Type Gasket D1000 Features Guide product image
【For Chemical Plants】Spiral Type Gasket D1000 Features Guide

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catalog(199)

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Processing example of a three-pass branch gasket.

Processing example of a three-pass branch gasket.

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Processing examples of EPDM shaped rubber gaskets

Processing examples of EPDM shaped rubber gaskets

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Processing examples of D6000 gaskets

Processing examples of D6000 gaskets

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Processing example of D5800 graphite-equipped frame gasket

Processing example of D5800 graphite-equipped frame gasket

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news(7)

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Received a courtesy visit as an "Excellent Reporting Corporation" from the Nishi-Nari Tax Office. (2013)

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Recognition as an Excellent Tax Reporting Corporation (2013) On May 31, 2013, we received a commendation from the Nishinari Tax Office as an Excellent Tax Reporting Corporation. An Excellent Tax Reporting Corporation is a system that recognizes and commends corporations whose management practices are excellent, and whose tax reporting and payment are conducted appropriately, with particularly outstanding accounting practices, as selected by the tax office's criteria. Currently, less than 1% of all corporate entities in Japan are designated as "Excellent Tax Reporting Corporations." We are deeply honored and grateful for this recognition, and we sincerely accept it, striving to continue being a company that complies with tax laws and fulfills its social responsibilities.

Dec 03, 2025

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The Nishinari Tax Office has honored us as an "Excellent Declarant Corporation" for two consecutive times. (Heisei 30)

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Recognition as an Excellent Reporting Corporation (2018) On May 31, 2018, we received a commendation from the Nishinari Tax Office as an Excellent Reporting Corporation. This is an honor that follows our certification on May 31, 2013, marking our second consecutive recognition. An Excellent Reporting Corporation is a system that selects and recognizes corporations whose management practices are excellent, and whose tax reporting and payment are conducted appropriately, with particularly outstanding accounting practices, based on criteria set by the tax office. Currently, less than 1% of all corporate entities in Japan are designated as "Excellent Reporting Corporations." We are deeply grateful for this honor, which is entirely due to the support of our customers and business partners. We are committed to continuing our efforts to be a company that contributes to society, so as not to bring shame to this honor.

Dec 03, 2025

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We have been honored as an "Excellent Tax Reporting Corporation" by the Nishi-Nari Tax Office for three consecutive times. (Year 7 of Reiwa)

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Recognition as an Excellent Reporting Corporation (Reiwa 7) On November 27, Reiwa 7, we received a courtesy visit from the Nishinari Tax Office as an "Excellent Reporting Corporation." This honor marks our third consecutive recognition, following certifications in Heisei 25 and Heisei 30. An Excellent Reporting Corporation is a system that certifies and honors companies recognized by the tax office as having exceptionally good management and making proper declarations and tax payments. Currently, it is said that less than 1% of corporate entities in Japan are selected as Excellent Reporting Corporations, and receiving this recognition three times in a row is seen as an acknowledgment of our long-standing proper accounting practices and management quality. We deeply appreciate this honorable recognition, which is entirely due to the guidance and support of our customers, business partners, and all related parties. Encouraged by this recognition, we are committed to continuing to contribute to society through proper declarations and tax payments, and we will strive even harder to remain a company trusted by everyone.

Dec 03, 2025

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Detailed information

Company name ダイコー 本社
number of employees80
Contact addresspostalcode 557-0063 Osaka/ Nishinari-ku, Osaka-shi/ Nanjin Guard 4-4-12View on map TEL:06-6657-0374 FAX:06-6657-0397
Key Partners~Main Products~ ★Gaskets and Packing Daiko Co., Ltd. Nippon Asahi Glass Co., Ltd. Nihon Vulcan Industry Co., Ltd. Nihon Pillar Industry Co., Ltd. Air Water Mach Co., Ltd. ★Rubber and Sponge Iruma River Rubber Co., Ltd. Osaka Rubber Co., Ltd. Tiger Polymer Co., Ltd. Kureha Elastomer Co., Ltd. Inoac Corporation San Polymer Co., Ltd. Nobukawa Co., Ltd. ★Resin Materials Nippon Asahi Glass Co., Ltd. Nihon Vulcan Industry Co., Ltd. Yodogawa Hu-Tech Gore Japan, Inc. Mitsubishi Chemical Corporation Please feel free to contact us regarding other manufacturers and materials.
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Industry Building materials, supplies and fixtures
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