High-strength aluminum bolts suitable for use in automobiles. Also adopted for drones!!
■ Yamashina has been working on the development of aluminum bolts for nearly 10 years. ■ Through numerous trials and errors, including benchmarking against European car manufacturers, developing shapes to increase resistance to stress, researching surface treatments, and studying cold working conditions, we are now establishing a mass production system centered around A6056 and A7050 materials. We provide various know-how necessary for fastening, including fatigue resistance, changes in strength due to temperature, and changes in friction coefficients for fastening conditions. ■ We offer genuine aluminum bolts that can be safely used, along with our expertise, rather than just lightweight and high-strength aluminum bolts that are merely advertised. * For data and material requests, please feel free to contact us through the Yamashina website: http://www.yamashina.ne.jp/
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basic information
■ Material We propose primarily the A6056 material, which has a proven track record in European and American automobiles. This is a reliable material with a low risk of stress corrosion cracking. For applications other than automobiles, we also have mass production experience with A7050 and A5052 materials, and using A7050 can achieve a strength of about 600 MPa. ■ Tensile Strength The tensile strength of A6056 material is approximately 410 MPa, but the bolts processed by our company have a tensile strength of about 450 MPa. This is due to the development of shape, heat treatment, and manufacturing methods. ■ Manufacturing Technology Did you know that creating hex flange heads from aluminum can lead to cracking? Generally, aluminum has poor ductility, and processing under the same conditions as iron bolts can result in cracking or "voids." We have developed aluminum-specific processing conditions that prevent these issues, allowing us to provide manufacturing technology that can offer shapes similar to those of iron bolts. ■ Fastening Know-How We possess extensive knowledge regarding the effects of heat on bolt strength, fatigue strength, and methods for controlling friction coefficients, among other mechanical properties. Additionally, since the material strength differs from that of iron, establishing a secure fastening requires various innovations in fastening methods. Our long years of research have equipped us with a wealth of insights in these areas, which is one of our strengths.
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■ Adopted by Japanese drone manufacturers!! Please consider lightweighting for robots as well. ■ Example of lightweighting The specific gravity of aluminum is about one-third that of iron. In the case of using 20 bolts with a diameter of M8 and a length of 80mm, depending on the shape, this can lead to a weight reduction of approximately 170g compared to using iron bolts. ■ For autonomous driving parts, etc. These are aluminum alloy bolts that are not affected by radio waves. * For data and material requests, please feel free to contact us through the Yamashina website: http://www.yamashina.ne.jp/
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Company information
Established in 1917, during the dawn of mass production of screws in Japan, the company succeeded in producing the first domestic cross-recessed screws in 1949 and cooperated with the government to domesticate tapping screws in 1954. We hold data on over 200,000 types of screws and bolts, enabling us to manufacture a variety of products with high quality. Recently, we have been focusing on research and development investments, working on tapping bolts with a diameter of 6mm or more, high-strength aluminum bolts, tapping screws for thin steel plates, and tapping screws for CFRP, which will support the next generation. We are committed to challenging innovative technology development without being bound by history.
