The Art of Manufacturing by Sugita Wire
Shaping the future through trusted quality and agile manufacturing.
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Combining technologies of cold heading wire and spring wire
We are one of the few manufacturers in Japan that specialize in both cold heading wire and spring wire. By integrating the technologies and equipment developed in each field, we offer a hybrid manufacturing approach that meets a wide range of applications and demanding quality standards.
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Flexible production capabilities to handle small lots, high-mix orders, and short lead times.
To meet the diverse needs of our customers, we support a wide range of wire diameters from 0.5 mm to 55.0 mm. With over 6,000 combinations of steel grades and wire sizes, we are highly flexible in accommodating specification changes and prototyping requests.
We also maintain strict inventory control of materials and finished products, enabling quick delivery for high-mix, low-volume production.
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Environmentally Friendly Product Line
Cold heading wire and oil-tempered wire can be processed at room temperature without the need for heating or heat treatment.
By combining our technologies and facilities for cold heading steel wire and spring steel wire, we have developed proprietary non-quenched and tempered steel wire. This product eliminates the need for post-forming heat treatment at the customer’s site, and its stable quality has been proven through many years of use.
We also recycle waste sulfuric acid generated in the steel wire production process and manufacture inorganic polymer coagulants (POLYTETSU) on a contract basis.
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Trusted quality, proven manufacturing. Supporting the future of the automotive industry
Many of our products are used in critical safety components for the automotive and industrial machinery sectors. To meet the industry's strict quality standards, we have established a rigorous quality management system across every stage of the manufacturing process.
From material receiving to final inspection—and even container loading for export shipments—we manage the entire workflow in-house. This integrated approach ensures consistent product quality and total traceability, earning the trust of our customers worldwide.
Typical Manufacturing Process
We design our manufacturing processes to meet each customer's specific requirements, combining key production steps to deliver wire that is easy to work with and consistently reliable in quality.
Pickling
We perform acid pickling to dissolve and remove oxide scale formed during hot rolling by steel manufacturers or during our own heat treatment processes.
After cleaning the surface, we apply a suitable coating to ensure lubricity.
This helps reduce friction during wire drawing and cold heading at the customer’s site, improving process efficiency.
Heat Treatment
We offer three types of heat treatment:
Annealing,
Patenting, and
Oil Tempering.
Annealing
Primarily applied to cold heading wire, this process transforms the steel into a spheroidized structure, improving formability and making the wire softer.
Patenting
Used mainly for high-carbon steel wire, the wire is heated to a high temperature and then cooled to a specified temperature to induce an isothermal transformation, resulting in a fine, tough microstructure.
Oil Tempering
Applied primarily to spring wire, the wire is rapidly quenched from high temperature and then reheated to a specified temperature for tempering, achieving high strength and toughness.
Wire Drawing
We use dies to draw wire to the required diameter.
This process improves strength, formability, roundness, and surface smoothness.
We have various machines including single-die and continuous drawing machines, allowing us to handle a wide range of product types.
Inspection
We are equipped with a wide variety of inspection systems to handle our extensive product range. We conduct in-process inspections as well as final inspections based on the specifications agreed upon with each customer.
