World-recognized technology and
advanced equipment to support it.
Amatsuji Steel Ball Mfg. is developing not only steel balls but also various other technologies and products through tireless technological development. We work together with our customers to develop high quality products and technologies.
Technology & Products
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Steel balls 0.1 mm in diameter
Steel balls with a diameter of 0.1 mm can be processed by grinding.
The photo shows a comparison with a mechanical pencil lead with a diameter of 0.5 mm. -
Ceramic Master Ball
The “Master Ball” is a reference ball used for dimensional measurements of precision machines, and is a ball with a thoroughly enhanced sphericity. The material used is ceramic (silicon nitride) and boasts the highest level of sphericity on earth.
Analytical instruments (example)
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Non-contact 3D surface profilometer
Non-contact 3D surface profile measuring device
This instrument can measure the surface roughness of a steel ball without touching the ball and display it in three dimensions.
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Scanning Electron Microscope
Scanning electron microscope
This instrument is used for observation of microstructure under high magnification and qualitative analysis by EDX.
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X-ray diffractometer
X-ray diffraction device
Equipment for measuring residual stress and residual austenite content of steel balls.
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Lifetime tester
Life test machine
This tester is used to evaluate the rolling fatigue life of steel balls.
