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  6. [Factory Introduction] This is Factory No. 3! A full reveal of the layout and equipment.

[Factory Introduction] This is Factory No. 3! A full reveal of the layout and equipment.

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last updated:Sep 25, 2025

大窪鐵工所
大窪鐵工所
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We provide consistently high-precision technology from processing to assembly and quality control.

At the third factory, we process parts used in hydraulic multi-control valves for Kawasaki Heavy Industries, and we have established a production system that can flexibly accommodate irregularly shaped products and a variety of small-lot items. Additionally, in assembly work conducted in a clean room, we thoroughly eliminate foreign matter and contamination to ensure high-precision products. We also conduct pressure tests using leak testers to rigorously verify the quality and reliability of our products. In recent years, we have become the only facility within the company to handle aluminum processing, broadening our technical capabilities to meet the needs of more diverse fields and promote technological innovation. In this way, our factory achieves high quality assurance and continues to evolve.

    Hydraulic Equipment
img_factory_03.jpg

[Factory Introduction] This is Factory No. 3! A full reveal of the layout and equipment.

img_factory_03.jpg
img_factory_03.jpg
  • Related Link - https://www.okubotk.co.jp/access/

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Headquarters Factory: Rebar cutting, lathe, machining, grinding, welding, painting Second Factory: Lathe, machining, surface grinding, wrapping Third Factory: Machining, cleaning, assembly, inspection Fourth Factory: Lathe, machining, assembly, painting Fifth Factory: Lathe, machining All factories are located within walking distance!

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Introduction materials for Okubo Iron Works, Factory No. 3

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Okubo Iron Works Co., Ltd. Company Profile

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大窪鐵工所

大窪鐵工所

Machine elements and parts

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Founded in 1948, we are a specialized manufacturer focused on precision machining. For over 70 years, we have been committed to "high precision and high quality," accumulating numerous achievements in the processing of construction machinery parts and hydraulic equipment parts. - Material procurement (general steel, special steel, castings, etc.) - Bar cutting - General heat treatment (quenching, nitriding, carburizing, high-frequency hardening, etc.) - General surface treatment (painting, plating, Parkerizing, deflaking, etc.) - NC lathe, machining center, grinding, welding, etc. We can arrange and manage all processes in-house. Leave everything to us! With a comprehensive set of inspection equipment and a quality management system based on ISO 9001, we guarantee high precision requirements with quality control honed through long-term transactions with renowned top manufacturers. Whether for prototypes or mass-produced items, please feel free to consult us regarding any machining concerns!

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