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Jun. 27, 2024
Hexagonal flange bolts, also known as hex flange bolts, flange head bolts, and DIN 6921 flange bolts, are widely used industrial fasteners designed for secure and reliable mechanical connections.
Combining a hexagonal head and integrated flange face, these bolts provide a larger bearing surface compared with standard hex bolts. This design improves load distribution, increases clamping force, and enhances resistance against loosening under vibration and dynamic loads.
Juxin Fasteners specializes in manufacturing OEM hexagonal flange bolts for global industrial customers, including automotive manufacturers, machinery builders, construction equipment suppliers, energy companies, and structural engineering projects.
Our flange bolt solutions are available in various materials, strength grades, thread designs, and surface treatments to meet different application requirements.
A hexagonal flange bolt is an integrated fastening component consisting of:
Hexagonal head
Circular flange face
Threaded shaft
Unlike conventional hex bolts that require a separate washer, the flange design functions as a built-in washer.
The integrated flange provides:
Larger contact area
Improved pressure distribution
Higher preload capability
Better anti-loosening performance
Faster installation efficiency
Because of these advantages, hex flange bolts are widely used in applications requiring high mechanical reliability and long service life.
Hex flange bolts are generally identified by diameter and length.
Common metric specifications include:
M5 flange bolts
M6 flange bolts
M8 flange bolts
M10 flange bolts
M12 flange bolts
M16 flange bolts
M20 flange bolts
Common lengths include:
20 mm
30 mm
40 mm
Customized lengths according to customer requirements
The specification indicates the bolt size classification rather than the complete physical dimension.
Material selection directly affects bolt strength, durability, corrosion resistance, and service performance.
Juxin Fasteners supplies flange bolts using various steel materials.
Typical materials:
1008
1015
1018
1022
Characteristics:
Good machinability
Economical solution
Suitable for general fastening applications
Common applications:
Electrical equipment
General machinery
Light industrial assemblies
Typical materials:
35 Steel
45 Steel
1035
CH38F
1039
Advantages:
Higher strength than low carbon steel
Good toughness
Suitable for higher load applications
Common applications:
Grade 8.8 flange bolts
Mechanical equipment
Automotive components
Typical materials:
SCM435
40Cr
35CrMo
10B38
Alloy steel flange bolts are designed for high-performance applications requiring:
High tensile strength
Excellent fatigue resistance
Improved durability
Common strength grades:
Class 10.9
Class 12.9
Applications:
Heavy machinery
Automotive engines
Construction equipment
High-load structures
Juxin Fasteners provides hex flange bolts according to international mechanical property requirements.
Available grades:
Suitable for:
Industrial machinery
Automotive components
General engineering applications
Designed for high-stress applications:
Vehicle suspension systems
Heavy equipment
Engine assemblies
Used for extreme strength requirements:
Precision machinery
High-performance mechanical systems
Different working environments require different corrosion protection solutions.
Juxin provides:
Advantages:
Cost-effective corrosion protection
Suitable for indoor and general industrial environments
Applications:
Machinery
Electrical equipment
OEM assemblies
Provides enhanced corrosion resistance compared with standard zinc plating.
Applications:
Automotive components
Outdoor equipment
Designed for harsh environments.
Benefits:
Excellent corrosion resistance
High durability
Suitable for automotive and construction applications
Available materials:
Stainless Steel 304
Stainless Steel 316
Suitable for:
Marine equipment
Food processing machinery
Chemical equipment
Outdoor applications
The flange increases the support area between the bolt head and the connected surface.
Compared with standard hex bolts, flange bolts can provide:
Higher clamping force
Improved load distribution
Reduced surface deformation
Industrial equipment often operates under vibration and impact loads.
The flange design improves joint stability by increasing contact friction.
Applications include:
Automotive engines
Heavy machinery
Rail equipment
Construction machines
Because the flange replaces a separate washer:
Fewer assembly components are required
Installation time is reduced
Production efficiency improves
This makes hex flange bolts ideal for automated manufacturing environments.
Automotive systems require fasteners with excellent vibration resistance and fatigue performance.
Hex flange bolts are widely used in:
Engine assemblies
Suspension systems
Chassis structures
Transmission systems
EV battery systems
Juxin provides customized automotive flange bolt solutions for OEM manufacturers and Tier suppliers.
Heavy equipment requires reliable fastening solutions under extreme working conditions.
Applications include:
Excavators
Cranes
Loaders
Mining equipment
Agricultural machinery
High-strength flange bolts provide stable connections under heavy loads and continuous vibration.
Hex flange bolts are widely applied in:
CNC machines
Automation equipment
Industrial robots
Production lines
Mechanical assemblies
Their compact design and strong clamping performance improve equipment reliability.
Hex flange bolts are commonly used in pipe connection systems requiring secure sealing.
Applications:
Oil pipelines
Chemical pipelines
Water systems
Industrial fluid equipment
Proper tightening procedures ensure:
Uniform pressure distribution
Reliable sealing performance
Reduced leakage risk
Hex flange bolts are suitable for connecting structural components.
Applications:
Steel buildings
Bridges
Railway structures
Infrastructure projects
Their high strength and installation efficiency make them ideal for structural fastening.
Due to their excellent mechanical performance, flange bolts are widely used in:
Ships
Railway equipment
Bridges
Transportation systems
Corrosion-resistant coatings improve performance in demanding environments.
Juxin Fasteners supplies various flange bolt designs:
Standard industrial flange bolts widely used worldwide.
Features:
Serrated flange surface
Improved anti-slip performance
Better vibration resistance
Designed for applications requiring alternative drive systems.
Used in applications requiring additional locking performance.
Advantages:
Higher tensile strength
Better adjustment capability
Suitable for precision assemblies
Correct installation ensures maximum fastening performance.
Recommended procedure:
Align flange holes correctly.
Insert flange bolts through the connected components.
Install matching nuts.
Tighten bolts using a diagonal sequence.
Apply the recommended torque according to bolt grade and application requirements.
For multiple flange connections, gradual tightening in several stages helps achieve uniform clamping force and prevents sealing failure.
Juxin Fasteners provides professional hexagonal flange bolt manufacturing solutions for international OEM customers.
Our capabilities include:
Cold forging
Thread rolling
CNC machining
Heat treatment
Surface coating
Inspection includes:
Material verification
Dimensional inspection
Thread inspection
Mechanical testing
Coating inspection
We support:
Customer drawings
Special dimensions
Customized materials
Special coatings
OEM packaging
Looking for a reliable supplier of hexagonal flange bolts, DIN 6921 flange bolts, high-strength flange bolts, or customized industrial fasteners?
Juxin Fasteners provides professional fastening solutions for automotive, machinery, construction, energy, and industrial applications.
Email: info@juxinfasteners.com
Website: https://www.juxinfasteners.com
Contact our engineering team for customized OEM hex flange bolt solutions based on your technical requirements.
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