Hot - dip galvanized flange nuts, also known as hexagon nuts with flange, are a type of fastener.
- Definition and Manufacturing Process: Hot - dip galvanized flange nuts are produced through a strict hot - dip galvanizing process. The nuts are usually made of carbon steel and are dipped into a molten zinc bath at about 450°C. As a result, a firm and corrosion - resistant zinc coating is formed on their surface, which can provide excellent protection against rust and harsh environmental conditions.
- Design Features: These nuts have internal threads that match the external threads of bolts. They are characterized by an enlarged circular base, which increases the bearing surface area. The wide flange is equivalent to an integrated non - rotating washer, which can evenly distribute the load and enhance the firmness of the connection. Some flange nuts also have serrations on the bottom, which can play a anti - loosening role and increase the holding force by preventing vibration.
- Performance Advantages: The zinc coating of hot - dip galvanized flange nuts has the characteristics of strong toughness, which can withstand mechanical damage during transportation and use. And due to the sacrificial protection effect of zinc, even if the coating is scratched, it can still protect the base metal. In addition, the hot - dip galvanizing process can ensure that every part of the nut, including recesses and sharp corners, is coated with zinc, providing comprehensive protection.
- Common Specifications: Common specifications include M5, M6, M8, M10, M12, M16, M20, etc. Flange nuts above M20 are often flat flanges without serrations, which are used in special equipment and specific applications.
- Application Scenarios: They are widely used in construction, infrastructure development, marine engineering, outdoor installations and other fields. Whenever a sturdy and corrosion - resistant fastening solution is required, hot - dip galvanized flange nuts can play an important role.
- Relevant Standards: The thread standards usually comply with metric standards such as ISO 4017 or imperial standards such as ASME B1.1. The galvanizing standard can refer to ASTM A153, EN 1461, etc. The performance grade is marked on the nut, such as grade 4.8, 8.8, etc.
- Quality Control: In the quality inspection, the coating thickness can be measured by a magnetic thickness gauge to ensure compliance with the standard. At the same time, it is necessary to check whether the thread accuracy meets the requirements through a go/no - go gauge to ensure that it can be well matched with the bolt.
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