Product Structure & Working Principle
Flange bolts consist of a hexagonal head with a flange and a screw. Flange nuts consist of two parts: the nut body and the flange. The body of the nut has a threaded hole that matches the bolt, while the flange increases the contact area between it and the connecting parts, improving the stability and load-bearing capacity of the connection.
Flange bolts and nuts are widely used in construction, bridges, vehicles, ships and other types of projects for connecting and fixing various components. When selecting and using them, their specifications, materials and performance levels should be determined according to the actual working conditions and use requirements, and ensure that the selected products comply with the relevant standards and norms.
During the installation process, it should be ensured that the threads of bolts and nuts are well matched to avoid the phenomenon of jamming or slipping threads, and should be tightened according to the specified torque to ensure the reliability of the connection. In addition, check the tightening status of flange bolts and nuts regularly to find and deal with loosening, corrosion and other problems in time.
Parameter
|
Standard |
DIN6921 |
|
Name |
Flange bolts and nuts |
|
Material |
Carbon steel and alloy steel, etc. |
|
Grade |
Grade 4.8, 5.8, 8.8 |
|
Nominal Diameter |
M2-M48 |
|
Pitch |
0.4-5 |
|
Finish |
ZP,YZ,BLACK |
|
Alias |
Rim Screws |
Installation & Maintenance Notes
Thread fit check
Confirm precise thread matching between bolt and nut to prevent thread seizure, stripping or sliding.
Torque control
Fasten strictly per rated torque value to secure connection reliability, avoid under-tightening loosening or over-tightening material damage.
Periodic inspection
Regularly check tightening condition, timely address loosening, rust, corrosion and fatigue failure risks to extend service life.
Product Applications
Construction Engineering Field
DIN6921 flange bolts and nuts expand bearing area via integrated flanges with high load capacity and stable locking. They are widely used for fixing steel structure workshops and prefabricated building components, resisting structural deformation and securing long-term stable building connections.
Bridge Infrastructure Field
Flange bolts and nuts are suitable for fastening bridge girders, supports and guardrails. With strength grades of 4.8/5.8/8.8 and anti-corrosion surface finishes, they withstand outdoor corrosion and vibrational loads to firmly connect bridge steel structures.
Vehicle Transportation Equipment Field
Available in full sizes from M2 to M48, these flange bolts and nuts feature integrated flanges that eliminate the need for extra gaskets. They fit chassis and component assembly for automobiles and engineering vehicles, preventing loosening from driving vibration and streamlining vehicle assembly procedures.
Marine Shipbuilding Field
Made of carbon steel and alloy steel with zinc plating, black oxide and other anti-corrosion treatments, these fasteners adapt to high-salt and humid marine environments. They bear impact loads from ocean waves and reliably fix ship hulls and onboard equipment.
Selection Guidance
Model, material grade and strength class must be chosen based on actual working load, vibration environment, corrosion risk and assembly requirements. All finished products strictly conform to DIN6921 industrial standard to guarantee compliance and safety.
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