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Jun. 23, 2024
Hexagonal flange bolts, also known as hex flange bolts, flange head bolts, and DIN 6921 flange bolts, are widely used mechanical fasteners designed to create strong and reliable connections between two components.
A hexagonal flange bolt combines a hexagonal head, integrated flange base, and threaded shaft into one complete fastening component. The integrated flange works as a built-in washer, increasing the bearing surface and improving load distribution during tightening.
Compared with standard hex bolts, hex flange bolts provide higher clamping force, improved anti-loosening performance, and better assembly efficiency, making them ideal for demanding industrial environments.
Juxin Fasteners specializes in manufacturing OEM hexagonal flange bolts for global customers in automotive, machinery, construction equipment, energy systems, electrical equipment, and industrial manufacturing industries.
Our production capabilities include customized sizes, strength grades, materials, thread designs, and surface treatments according to customer drawings and international standards.
A hexagonal flange bolt is an integrated fastener consisting of:
The hexagonal head design allows easy installation using standard wrenches and provides excellent torque transmission.
The six-sided structure is widely adopted because it provides the best balance between:
Installation efficiency
Torque capacity
Tool accessibility
Manufacturing cost
The flange section located under the hexagonal head acts as a permanent washer.
Its functions include:
Increasing contact surface area
Reducing surface pressure
Improving joint stability
Preventing deformation of connected parts
Eliminating the need for separate washers in many applications
The threaded section connects with a matching nut or threaded component to create a secure mechanical joint.
Available options include:
Full thread flange bolts
Partial thread flange bolts
Coarse thread flange bolts
Fine thread flange bolts
The larger support area of the flange allows the bolt to distribute tightening pressure more evenly compared with conventional hex bolts.
Benefits include:
Higher preload capability
Reduced surface damage
Improved joint reliability
Better resistance to loosening
This makes hex flange bolts suitable for high-load mechanical assemblies where connection stability is critical.
Industrial equipment often experiences vibration, shock loads, and repeated mechanical stress.
The flange design improves friction between the bolt head and the mounting surface, helping reduce the risk of loosening during operation.
Common applications include:
Automotive engines
Suspension systems
Heavy machinery
Pumps and motors
Construction equipment
The hexagonal head allows quick tightening and removal using standard tools.
Advantages:
Simple assembly process
Reduced installation time
Easy maintenance
Suitable for automated production lines
Compared with traditional bolt and washer combinations, flange bolts combine two components into one product.
This provides:
Fewer assembly parts
Lower installation cost
Reduced inventory requirements
Improved production efficiency
Juxin Fasteners supplies high strength flange bolts in various mechanical grades according to industrial requirements.
Available grades include:
Class 8.8 flange bolts
Class 10.9 flange bolts
Class 12.9 flange bolts
For North American applications:
SAE Grade 8 flange bolts
High-strength flange bolts are manufactured from alloy steel or medium carbon steel and processed through heat treatment processes such as quenching and tempering.
These bolts provide:
High tensile strength
Excellent fatigue resistance
Superior torque performance
Long service life
Different industrial environments require different corrosion protection solutions.
Juxin Fasteners provides:
Suitable for general industrial applications.
Applications:
Machinery assembly
Electrical equipment
OEM manufacturing
Provides improved corrosion resistance for outdoor and humid environments.
Recommended for:
Dry environments
Automotive components
General mechanical applications
High-performance coating solution for demanding applications.
Advantages:
Excellent corrosion resistance
Improved durability
Suitable for automotive and industrial environments
Used where higher corrosion resistance is required.
Typical applications:
Automotive systems
Construction machinery
Outdoor equipment
Materials available:
Stainless Steel 304
Stainless Steel 316
Suitable for:
Food processing equipment
Marine equipment
Chemical systems
Medical equipment
The automotive industry requires fasteners with excellent vibration resistance and fatigue performance.
Hex flange bolts are widely used in:
Engine assemblies
Vehicle chassis
Suspension systems
Brake systems
Battery pack structures
EV components
Juxin provides automotive flange bolt solutions supporting OEM manufacturers and Tier suppliers.
With the development of electric vehicles, reliable fastening solutions are essential for battery and structural systems.
Applications include:
EV battery modules
Battery trays
Motor assemblies
Charging equipment
Structural frames
High-strength Class 10.9 hex flange bolts provide excellent mechanical reliability for EV applications.
Large machines require fastening systems capable of handling heavy loads and vibration.
Hex flange bolts are used in:
Excavators
Cranes
Loaders
Agricultural machinery
Mining equipment
Their high preload capability helps maintain stable connections under extreme working conditions.
Hex flange bolts are commonly used in:
CNC machines
Automation systems
Robotics equipment
Production lines
Industrial assemblies
They provide reliable fastening performance while improving manufacturing efficiency.
Hex flange bolts are widely used in demanding environments including:
Petroleum equipment
Chemical processing systems
Power generation equipment
Pipeline assemblies
Pressure equipment
High-strength and corrosion-resistant flange bolts help maintain secure connections under high temperature, pressure, and corrosive conditions.
Marine environments require excellent corrosion resistance.
Applications:
Ship equipment
Offshore structures
Marine machinery
Port equipment
Stainless steel and coated flange bolts provide enhanced protection against corrosion.
Juxin Fasteners supplies various flange bolt designs:
Standard flange bolts widely used in industrial applications.
Suitable for applications requiring maximum thread engagement.
Designed with serrated flange surfaces for improved locking performance.
Used in vibration environments requiring additional locking capability.
Available with:
Coating options
EPDM composite washers
Customized designs
Proper installation ensures maximum fastening performance.
Recommended practices:
Align the bolt holes correctly before assembly.
Insert flange bolts through the connecting components.
Install the matching flange nut.
Tighten bolts using a diagonal sequence when multiple bolts are used.
Apply the recommended torque specification according to bolt grade and application requirements.
Correct installation helps achieve:
Uniform clamping force
Reduced stress concentration
Improved service life
Juxin Fasteners provides professional custom hex flange bolt manufacturing solutions for international OEM customers.
Our capabilities include:
Cold forging production
CNC machining
Thread rolling
Heat treatment
Surface coating
We provide:
Material inspection
Dimensional inspection
Mechanical testing
Torque testing
Coating inspection
Support:
Customer drawings
Special dimensions
Custom materials
Special coatings
OEM packaging requirements
Looking for a reliable supplier of hexagonal flange bolts, DIN 6921 flange bolts, or high-strength flange bolts?
Juxin Fasteners provides professional fastening solutions for automotive, machinery, construction, energy, and industrial OEM applications.
Email: info@juxinfasteners.com
Website: https://www.juxinfasteners.com
Contact our engineering team for customized OEM flange bolt solutions according to your technical requirements.
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