Hexagonal Flange Screws Fastening Methods and Industrial Fastening Solutions

Hexagonal flange screws are one of the most widely used industrial fasteners for structural assemblies requiring high clamping force, reliable vibration resistance, and simplified installation. Combining a hex head with an integrated flange, these screws eliminate the need for a separate washer while distributing the clamping load evenly across the contact surface.

At Juxin Fasteners, we manufacture high-quality Hexagonal Flange Screws, Hex Flange Bolts, Hex Head Bolts, and custom OEM fasteners for global manufacturers in the automotive, construction, industrial equipment, railway, energy, and heavy machinery sectors.

This guide explains the construction, material selection, fastening methods, torque requirements, and industrial applications of hexagonal flange screws to help engineers and procurement professionals select the right fastening solution.

What Are Hexagonal Flange Screws?

A hexagonal flange screw consists of:

• Hexagonal head

• Integrated washer flange

• Threaded shank

The built-in flange increases the bearing surface, distributes the clamping force more evenly, and reduces the risk of damaging thin metal components. Compared with conventional hex bolts and washers, flange screws simplify assembly while improving fastening reliability.

Hexagonal flange screws are widely used in:

• Steel structures

• Heavy machinery

• Automotive manufacturing

• Industrial equipment

• Railway systems

• Agricultural machinery

• Construction equipment

• Electrical enclosures

• Renewable energy equipment

• Material handling systems

Product Types of Hexagonal Flange Screws

Juxin Fasteners manufactures a complete range of flange screw solutions, including:

• Hexagonal Flange Screws

• Hex Flange Bolts

• Serrated Flange Bolts

• Flanged Hex Head Screws

• Hex Head Cap Screws

• Metric Flange Bolts

• UNC / UNF Flange Screws

• OEM Custom Flange Fasteners

Depending on the application, flange screws are available with:

• Flat flange

• Serrated flange for vibration resistance

• Partial thread

• Full thread

• Standard hex head

• Heavy hex head

Materials and Strength Grades

Selecting the proper material is essential for ensuring mechanical performance and service life.

Low Carbon Steel

Common grades:

• Q195

• Q235

• 1008

• 1015

• 1018

• 1022

Mechanical Property Classes:

• Class 4.6

• Class 4.8

• Class 5.8

Ideal for general industrial assembly and light-duty equipment.

Medium Carbon Steel

Typical materials include:

• 35 Steel

• 45 Steel

• C1035

• C1045

Mechanical Property:

• Class 8.8

Heat-treated to improve tensile strength and fatigue resistance.

Alloy Steel

Premium materials include:

• SCM435

• 35CrMo

• 40Cr

• 42CrMo

• 10B38

Available Strength Classes:

• 8.8

• 10.9

• 12.9

Recommended for high-load structural assemblies, automotive chassis, mining equipment, and heavy machinery.

Stainless Steel

Available grades:

• SUS304 (A2-70)

• SUS316 (A4-70)

• SUS410

Suitable for corrosive environments, food processing equipment, marine engineering, HVAC systems, and outdoor installations.

Surface Finishes

To improve corrosion resistance and extend service life, Juxin Fasteners offers:

• Zinc Plating

• Zinc Yellow Chromate

• Zinc Nickel Plating

• Mechanical Zinc

• Hot Dip Galvanizing

• Black Phosphate

• Black Oxide

• Dacromet®

• Geomet®

• PTFE Coating

The appropriate surface finish depends on the operating environment, corrosion requirements, and industry standards.

International Standards

Our flange screws are manufactured in accordance with international specifications, including:

• DIN 6921

• ISO 898-1

• SAE J429

• SAE J1199

• ASTM F593

• ASME B18.2.3.9M

• IFI 111

These standards ensure dimensional accuracy, mechanical properties, and reliable performance for industrial applications.

Recommended Fastening Methods

Proper tightening procedures are critical to achieving the required preload and preventing joint failure.

Manual Tightening

Suitable for:

• General industrial equipment

• Standard machinery

• Pipe flange assemblies

• Light structural applications

Recommended tightening sequence:

• Install gasket and alignment bolts

• Hand-tighten all bolts

• Tighten bolts in a crisscross pattern

• Increase tightening force in stages (50%, 80%, 100%)

• Perform a final circular tightening inspection

Torque Wrench Installation

Recommended for:

• Pressure vessels

• High-temperature equipment

• Chemical processing plants

• Oil & gas pipelines

• Flanged piping systems

Advantages include:

• Accurate preload control

• Uniform bolt loading

• Improved sealing performance

• Reduced gasket failure

• Enhanced joint reliability

Always tighten flange bolts using a cross-pattern sequence while gradually increasing torque to the specified value.

Hydraulic Bolt Tensioning

For critical industrial applications, hydraulic bolt tensioners provide the highest tightening accuracy.

Typical industries include:

• Offshore engineering

• Petrochemical facilities

• Nuclear power plants

• Steam turbines

• Wind power equipment

• Large industrial compressors

Hydraulic tensioning minimizes bolt stress variation and provides superior preload consistency for safety-critical assemblies.

Industrial Applications

Hexagonal flange screws are trusted across a wide range of industries.

Automotive Manufacturing

Used in:

• Engine assemblies

• Suspension systems

• Transmission housings

• EV battery packs

• Chassis components

Heavy Machinery

Suitable for:

• Excavators

• Cranes

• Mining equipment

• Agricultural machinery

• Hydraulic systems

Construction & Steel Structures

Applications include:

• Structural steel

• Bridges

• Towers

• Industrial buildings

• Prefabricated steel structures

Railway Equipment

Used for:

• Rail fastening systems

• Brake assemblies

• Bogies

• Heavy-duty mechanical connections

Renewable Energy

Installed in:

• Wind turbines

• Solar mounting systems

• Energy storage equipment

Industrial Manufacturing

Common applications include:

• CNC machines

• Automation equipment

• Packaging machinery

• Robotics

• Material handling systems

Why Choose Juxin Fasteners?

Juxin Fasteners supplies precision-engineered fastening solutions for global OEM manufacturers.

Our capabilities include:

• Carbon Steel Fasteners

• Alloy Steel Fasteners

• Stainless Steel Fasteners

• Hexagonal Flange Screws

• Hex Flange Bolts

• Hex Head Bolts

• Socket Head Cap Screws

• Thread Cutting Screws

• Self-Tapping Screws

• Weld Nuts

• Rivet Nuts

• Thread Insert Nuts

• Lock Nuts

• Custom CNC Fasteners

• OEM & ODM Manufacturing

Every product is manufactured under strict quality control to ensure dimensional accuracy, mechanical performance, and long-term reliability.

Frequently Asked Questions

What is the advantage of a flange screw?

A flange screw incorporates an integrated washer that distributes clamping force evenly, reducing assembly time and minimizing the risk of surface damage.

Are flange screws stronger than standard hex bolts?

Strength depends on the material grade and mechanical property class rather than the flange itself. Flange screws are available in Class 4.8, 8.8, 10.9, and 12.9 to meet different application requirements.

When should serrated flange screws be used?

Serrated flange screws are recommended for applications subject to vibration, where improved resistance to loosening is required.

Which industries use hexagonal flange screws?

They are widely used in automotive manufacturing, construction, railway systems, renewable energy, heavy machinery, industrial automation, agricultural equipment, and material handling equipment.

Contact Juxin Fasteners

Looking for a trusted manufacturer of Hexagonal Flange Screws, Hex Flange Bolts, Hex Head Screws, Hex Head Bolts, Thread-Cutting Screws, Socket Head Cap Screws, Weld Nuts, Rivet Nuts, or custom industrial fasteners?

Our engineering team is ready to help you select the right fastening solution for your project.

Email: info@juxinfasteners.com