The responsibility to preserve and pass on Suehiro's technology.
No advanced technology is born overnight.
It is the result of the long history of innovation and refinement by those who came before us.
Especially in Japan, people have a deep-seated dedication to improvement and refinement, which has enriched the nation through craftsmanship and manufacturing.
Suehiro Kogyo’s technology is also an extension of this tradition, honed over a long period. This is why we emphasize the principle of “never working carelessly” on our production floors.
Even when producing the same items daily, we constantly ask ourselves: Can we make this process more efficient? Can we make it safer? Can we save more time? These constant “how can we improve?” efforts have led to the technologies and quality control systems we have today.
Our mission as engineers is to apply these advancements to product manufacturing and pass them on to the next generation.
Product Technology #1 “Straightening, Cutting, and Correction Technology”
We produce exceptionally straight products with high precision, achieving straightness of 0.1/1000mm.
Our standard straightness is 0.1/1000mm, but for special specifications, we can achieve ultra-high precision of 0.05/1000mm.
Manufacturing perfectly straight and round products, such as shafts for brush cutters (lawn and grass trimmers) or conveyor shafts used in production lines, requires overcoming the natural tendency of steel to bend. This challenge demands not only advanced and customized equipment but also the expertise to utilize it effectively.
Finally, it is the human touch that ensures consistently high quality. Even in today’s highly automated and high-tech manufacturing environments, achieving precision beyond standard specifications relies on the skilled craftsmanship that Suehiro Kogyo has refined over the years.
Specifications:
【Standard】Outer diameter: φ1.0 to φ12.0, Straightness: 0.1/1000mm
【Special Specifications】Available upon consultation
Product Technology #2 “Long-Length, Precision Machining Technology”
"Long-length" is a technology so closely associated with us that some customers even think of Suehiro Kogyo when they hear the term.
Even for products as long as 4000mm, we achieve straightness of 0.1/1000L or less.
As the length increases, it becomes more challenging to maintain straightness due to factors like self-weight, which is a characteristic of steel. However, there is high demand for shafts with extreme straightness, such as those used in manufacturing lines for large LCD panels, where Suehiro Kogyo’s unique technology is fully utilized.
In brush cutter components, both straightness and coaxiality are closely related to vibration suppression and energy loss. As a result, there are products that require the use of Suehiro-quality components as a fundamental standard.
Specifications:
● Straightness: 0.1/1000mm ● Outer diameter: up to Φ50 ● Length: up to 4000L
Product Technology #3 “Centerless Grinding Technology”
Centerless grinding is the most historic business at Suehiro Kogyo, dating back to the founding of the company and serving as the catalyst for its establishment.
Centerless grinding technology determines the outer diameter tolerance, straightness, roundness, and surface roughness, which directly impact the performance of the shaft as a component.
We manufacture products with micron-level precision, working with a variety of materials such as metals, non-ferrous metals, FRP, and PVC, each with different material properties and hardness.
By introducing and properly using equipment with the necessary specifications, standard precision can be achieved. However, for special processing beyond numerical control, the Suehiro quality is elevated through the skilled hands of experienced craftsmen.
Specifications:
● Outer diameter: φ0.3 to Φ60 ● Length: up to 7000L
| Outer diameter tolerance | Roundness (Out-of-roundness) | Surface roughness | |
|---|---|---|---|
| Standard | h7・h6 | One-third of the outer diameter tolerance | Rz 3.2 |
| Ra 0.8 | |||
| Special specifications | h5 | 0.002 | Rz 0.4 |
| （Excluding 20L from one end） | Ra 0.2 |
Product Technology #4 “Material Technology”
The birth of a great product starts with carefully selected materials.
Metals can have dramatically different properties based on their composition, so selecting materials requires careful consideration of factors like strength, hardness after heat treatment, and toughness, as well as balancing these with special hardness requirements. For CFRP products, we also conduct material design tailored to customer specifications, producing products suited for their intended applications.
Our motto is not just to purchase materials, but to procure the optimal materials. When we successfully mass-produced pipe shafts for brush cutters for the first time in Japan, we repeatedly conducted tests with metal manufacturers to create a material recipe suitable for the final product, ensuring tensile strength while minimizing vibration.
This is an example of the material technology made possible by Suehiro Kogyo, which has a deep understanding of materials and a network built over 60 years of history.
