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  1. Home
  2. Industrial Machinery
  3. 入野機工
Industrial Machinery
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入野機工

EstablishmentMarch 16, 2020
capital1000Ten thousand
number of employees17
addressKanagawa/Yokosuka-shi/Hikari-no-oka 7-3
phone046-874-7444
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last updated:May 01, 2026
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  • Products/Services(7)
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入野機工 Company Overview

Achieving super-high precision internal grinding

Irino Kiko Co., Ltd. (a full member of the Japan Precision Machinery Manufacturers' Association) manufactures precision internal grinding machines capable of processing difficult-to-cut materials and meeting high precision requirements. We have achieved roundness of 0.07μm, generally maintaining levels around 0.1 to 0.2μm for machine deliveries. Professional engineers are continuously developing and manufacturing products in areas such as the main body of internal grinding machines, spindle axes, jigs, and electrical control. We manufacture, sell, and repair general-purpose and hybrid precision internal grinding machines, large general-purpose precision internal grinding machines, NC precision internal grinding machines, spindle axes (grease-lubricated and oil mist-lubricated), and rotating tools (Kere). We also have a track record of developing, manufacturing, and selling special internal grinding machines tailored to specific workpieces. Our professional engineers, specializing in the manufacturing of internal grinding machines and machine tools, will continue to support the industry and meet your needs.

Business Activities

The YIG series internal grinding machine, with cumulative sales exceeding 3,100 units, is a versatile precision internal grinder that maximizes the benefits of manual operation with a push-button analog control. It allows operators to directly feel the grinding sensation and convey their skills, achieving advanced precision machining that cannot be accomplished with NC machines. We have launched the hybrid precision internal grinding machine IIG-20H (IRINO INTERNAL GRINDING), which evolves the YIG, starting in February 2024. By retaining the advantages of manual operation with handles and levers, and incorporating Mitsubishi Electric's touch panel sequencer control along with Renishaw's absolute scale and solenoid valves, it enables digital representation of positional relationships comparable to NC machines, reducing the burden on operators and allowing for efficient high-precision grinding. Additionally, when combined with external robots like auto loaders, it enables mass production similar to that of NC machines. For more features and details, please visit the Irino Kiko channel on YouTube at https://youtube.com/@irinokiko. We look forward to your inquiries!

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Products/Services (7)

Hybrid Precision Internal Grinding Machine IIG-20H product image
Hybrid Precision Internal Grinding Machine IIG-20H
Universal Precision Internal Grinding Machine YIG-15-SA product image
Universal Precision Internal Grinding Machine YIG-15-SA
Universal Precision Internal Grinding Machine YIG-20-M product image
Universal Precision Internal Grinding Machine YIG-20-M
Universal Precision Internal Grinding Machine YIG-20-MSA (Internal grinding for diameters of 8φ or less) product image
Universal Precision Internal Grinding Machine YIG-20-MSA (Internal grinding for diameters of 8φ or less)

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catalog(3)

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Precision Internal Grinding Machine Catalog IRINO Internal Grinding Machine

Precision Internal Grinding Machine Catalog IRINO Internal Grinding Machine

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YIG General Precision Internal Grinding Machine Catalog

YIG General Precision Internal Grinding Machine Catalog

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Large General-Purpose Precision Internal Grinding Machine YIG-40 Catalog

Large General-Purpose Precision Internal Grinding Machine YIG-40 Catalog

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news(11)

Notice of Participation in JIMTOF2026 | New Hybrid Internal Grinding Machine IIG-15HE

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Irino Machinery Co., Ltd. will be exhibiting at JIMTOF2026. We will showcase the new hybrid internal grinding machine "IIG-15HE," which is currently under development. The IIG-15HE is Irino Machinery's next-generation model that combines new technologies while preserving the strengths of our conventional internal grinding machines, making it more suitable for mass production. We would like to have everyone who currently uses internal grinding machines see the actual machine and reflect their feedback in the final specifications of the IIG-15HE, so we will be displaying it as a "prototype." Please come and see the IIG-15HE at the venue. * Tokyo Big Sight, East Hall 7 * Booth No. E7048 Here is the introduction video: https://www.youtube.com/watch?v=K__NhD6F1As

Sep 14, 2026

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Information on Product Provision System and Transaction Types (for Users and Trading Companies)

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To ensure stable machining quality and technical support in the field of internal grinding, IRINO Machinery Co., Ltd. will transition to a new system based on direct manufacturer support beginning in the new fiscal year. Under this system, product specifications, pricing policy, and after-sales support will be managed in an integrated manner under the responsibility of the manufacturer. For our existing trading companies, we will continue working together as “Sales Support Companies,” responsible for contract handling, commercial flow coordination, and installation support. 【Support Structure】 1. Direct Manufacturer Support 2. Through Sales Support Companies 3. Referrals from Sales Support Companies Please note that even when a Sales Support Company is involved, the final amount paid by the customer will remain the same as in direct manufacturer transactions. Repair and consumable support may be handled through Sales Support Companies; however, matters related to machine accuracy and performance will be reviewed and handled directly by IRINO Machinery. For further details, please refer to the attached PDF.

May 01, 2026

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Information on the Sales Cooperation System (for Trading Companies)

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To ensure consistent technical and quality responsibility in the field of internal grinding, IRINO Machinery will transition to a new system based primarily on direct manufacturer support beginning in the new fiscal year. Under this new structure, IRINO Machinery will take the lead in managing product specifications, pricing policy, and technical support in order to provide more stable machining quality and customer support. For our existing trading companies, we will continue working together as “Sales Support Companies,” responsible for contract handling, commercial flow coordination, and installation support. Please note that even when a Sales Support Company is involved, the final amount paid by the customer will remain the same as in direct manufacturer transactions. For further details, please refer to the attached PDF.

May 01, 2026

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Detailed information

Company name 入野機工
number of employees17
Contact addresspostalcode 239-0847 Kanagawa/ Yokosuka-shi/ Hikari-no-oka 7-3View on map TEL:046-874-7444 FAX:046-874-7911
Key PartnersDaishowa Seiki Co., Ltd. Yoshida Manufacturing Co., Ltd. Kato-kenma Co., Ltd. Kato-seimitsu Co., Ltd.
Industry Industrial Machinery
入野機工 Building Image

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