中野ボールト工場 List of Products and Services

The greatest strength of Nakano Bolt Factory Co., Ltd. lies in bolt manufacturing utilizing "hot forging technology." Hot forging is a manufacturing method that involves processing metal while it is heated and in a flexible state. Using this method, our company produces bolts with various shapes of heads. We have a team of veteran craftsmen skilled in mold making, allowing us to create even special bolts. In the past, we have a track record of producing a single bolt, and our ability to manufacture small lots and a variety of products is one of the reasons why we are chosen by customers. 【Features of Hot Forging】 ■ Can manufacture even complex shapes ■ No internal defects and high strength *For more details, please refer to the PDF document or feel free to contact us.

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Nakano Bolt Factory Co., Ltd. is a bolt manufacturer registered as a testing factory by the Japan Water Works Association (registered in June 1973). To be registered as a "Japan Water Works Association Testing Factory," it must meet standards equivalent to JIS. Since it is tap water that we consume daily, strict standards are set to prevent health hazards due to defective bolts. *For more details, please refer to the PDF document or feel free to contact us.

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Nakano Bolt Factory is a comprehensive manufacturer of bolts. We manufacture and sell bolts primarily used in civil engineering, construction, steelmaking, shipbuilding, and railways, responding to increasingly complex and advanced needs year by year. Recently, our products have been used not only domestically but also in overseas railways. Additionally, our company is a certified factory of the "Japan Water Works Association Inspection Factory," which is considered difficult to obtain. Utilizing our greatest strength, "hot forging technology," we are committed to creating precise and flexible products every day. 【Strengths】 ■ Bolt experts ■ Strong in custom-made products ■ Integrated production system *For more details, please refer to the PDF materials or feel free to contact us.

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The Nakano Bolt Factory manufactures bolts used in water pipes as a certified factory by the Japan Water Works Association. Strict standards are set to ensure that the tap water we consume daily is not adversely affected by defective bolts (such as dimensional abnormalities or insufficient strength). As a certified factory, we undergo regular inspections from the Japan Water Works Association, which include on-site checks and product evaluations, ensuring that we always manufacture bolts in a fully compliant environment. 【Bolt Manufacturing Process】 1. Cutting: Cutting iron materials of about 6 meters to the required lengths. 2. Forging: Heating the cut pieces with heavy oil to shape the heads of the bolts. 3. Burr Removal: Removing burrs that form around the heads of the bolts during forging. 4. Upsetting: Reducing the diameter of the bolts by upsetting part of them. 5. Thread Rolling: Performing threading on the upset portion of the bolts. *For more details, please refer to the PDF document or feel free to contact us.

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• Manufacturing Technology

Our company uses hot forging technology, which involves heating metal to a flexible state for processing, to manufacture bolts with various head shapes. We have skilled artisans specializing in mold making, allowing us to create even special bolts. Additionally, we have a track record of producing even a single bolt in the past, and our ability to manufacture small lots and a variety of products is one of the reasons why we are chosen by customers. 【Features】 ■ Capable of manufacturing complex shapes ■ High strength with no internal defects *For more details, please feel free to contact us.

• Metalwork
• Work tools