This is an aluminum alloy nut for CFRP that prevents galvanic corrosion. It allows for fastening with metal bolts to CFRP without worrying about galvanic corrosion.
■ High Risk Mitigation for Galvanic Corrosion These are aluminum alloy nuts. They are treated with a patented special hard anodized coating on the surface to ensure electrical insulation and effectively prevent the occurrence of galvanic corrosion. When mounted on CFRTP containing 40% carbon fiber and subjected to corrosion resistance evaluation using the JIS saltwater alternating immersion method, they maintain corrosion resistance for 3,000 hours. ■ Synergy in Weight Reduction The specific gravity of aluminum armor nuts is one-third that of iron. This allows for weight reduction of both the material using CFRP and the nuts themselves simultaneously. ■ Strong Fastening Capability The pull-out strength exceeds that of conventional knurled insert nuts when mounted on CFRTP and pulled out. Additionally, the resistance to rotation and the strength of the internal threads are at the level where a bolt of strength class 10.9 would break when screwed in. The secret lies in the shape of the nut, which allows for easy flow of carbon fiber. ■ Contribution to Overall Cost Reduction The costs associated with galvanic corrosion measures that were previously necessary are reduced. This lowers the overall manufacturing costs, promotes the use of CFRP, and contributes to product weight reduction.
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basic information
■ The standard compatible sizes are for M6 and M8 bolts, but we also accommodate larger and smaller diameter bolts. Please feel free to consult with us. ■ We offer both insert type and outsert type. ■ We have two types prepared: one for mass production and one for small lots. ■ We provide three types of aluminum alloy materials according to your needs. * For data and material requests, please feel free to contact us through the Yamashina website: http://www.yamashina.ne.jp/
Price range
Delivery Time
※Prices may vary depending on quantity and specifications, so please feel free to contact us.
Applications/Examples of results
■ For bolted connections of materials such as CFRP, CFRTP, and magnesium alloys, where using iron bolts and nuts in corrosive environments can lead to galvanic corrosion. ■ For weight reduction purposes instead of using iron or brass nuts. ■ For electromagnetic wave countermeasures. *For data and material requests, please feel free to contact us through the Yamashina website: http://www.yamashina.ne.jp/
Detailed information
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Condition after the saltwater alternating immersion test The appearance after injecting the aluamarnut into CFRTP (PP-based CF-40) and conducting the saltwater alternating immersion test for 3000 hours. No electrocorrosion has occurred.
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General Products: Appearance of Electrocorrosion An experiment was conducted on general alumina nuts molded by injection molding into CFRTP (PP-based cf-40) with alternating immersion in saltwater. Corrosion has occurred.
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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.
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