Best Flange Bolts of 2026

Name: M5 Flanged Hex Bolts A2 Stainless Steel
Brand: Universal Hardware

Corey Phillips

Last Updated: 5 Feb 2026

* We independently evaluate all recommended products and services. If you click on links we provide, we may receive compensation.

Flange bolts are a type of fastener commonly used in construction, automotive, and industrial applications. These bolts have a wide, flat flange at the base that distributes the clamping force over a larger area, providing a more secure and stable joint. Flange bolts are available in various sizes, materials, and finishes to suit different requirements. They are known for their high tensile strength, corrosion resistance, and durability, making them a reliable choice for heavy-duty applications. Flange bolts are often used in conjunction with a flange nut to provide a secure and stable joint that can withstand high levels of stress and vibration.

At a Glance: Our Top Picks

#TOP 1

M5 Flanged Hex Bolts A2 Stainless Steel

9.8

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M5 Flanged Hex Bolts A2 Stainless Steel

#TOP1

9.8

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#TOP 2

Vifmy M6-1.0 x 12/16/20/25/30mm Flange Hex Head Bolts Assortment Kit (240 Pack) with Serrated Flange Nuts,Washers & Lock Spring Washers,Hex Head Screw,Alloy Steel Black Oxide Finish Plated Full Thread

9.7

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#TOP2

9.7

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#TOP 3

208 Pcs M6 Nuts and Bolts Set, Hex Serrated Flange Bolts and Nuts Set, Metric Flanged Hex Head Bolts and Nuts Assortment Kit, Black Assorted Machine Screws Flange Nuts Lock and Flat Washers Set (M6)

9.5

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208 Pcs M6 Nuts and Bolts Set, Hex Serrated Flange Bolts and Nuts Set, Metric Flanged Hex Head Bolts and Nuts Assortment Kit, Black Assorted Machine Screws Flange Nuts Lock and Flat Washers Set (M6)

#TOP3

9.5

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Top 10 Flange Bolts

#TOP 1

M5 Flanged Hex Bolts A2 Stainless Steel

Universal Hardware

FlangedHexBoltsA2

M5 x 16mm

M5 x 16mm Flanged Hex Bolts Fully Threaded A2 Stainless Steel - Secure Fastening Solution for Various Applications (Pack of 10)

9.8

FTB Score

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The M5 Flanged Hex Bolts are crafted from A2 Premium Stainless Steel, ensuring a secure grip and even load distribution for your projects. Their fully threaded design makes them versatile for various applications, from automotive body panelling to food industry uses where corrosion resistance is crucial. You’ll appreciate their durability and reliability, especially in indoor environments. These hexagonal shape bolts are perfect for interior balustrades, handrails, and shelving supports, making them a convenient choice for your fastening needs.

What We Like

Corrosion-resistant A2 stainless steel

Fully threaded for secure grip

Versatile for various applications

Available in multiple sizes

#TOP 2

Vifmy M6-1.0 x 12/16/20/25/30mm Flange Hex Head Bolts Assortment Kit (240 Pack) with Serrated Flange Nuts,Washers & Lock Spring Washers,Hex Head Screw,Alloy Steel Black Oxide Finish Plated Full Thread

Vifmy

FB-001

Black

Metric M6

Vifmy M6-1.0 x 12/16/20/25/30mm Flange Hex Head Bolts Assortment Kit (240 Pack) with Serrated Flange Nuts,Washers & Lock Spring Washers,Hex Head Screw,Alloy Steel Black Oxide Finish Plated Full Thread

9.7

FTB Score

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Features

Product Quantity: There Are 14 Pcs Flange Bolts In M6-12mm Length, 12 Pcs Flange Bolts In M6-16mm Length, 10 Pcs Flange Bolts In M6-20mm Length, 16 Pcs Flange Bolts In M6-25mm Length, 8 Pcs Flange Bolts In M6-30mm Length.There Are 60 Pcs M6-Flat Washers, 60pcs M6-Spring Washers, And 60 Pcs M6-Flange Nuts, Totaling 240 Pieces

Flanged Bolts Kit Specification: M6 Bolt Pitch 1.0 Mm. Screw Diameter 6 Mm; Screw Lengths Include: 12 Mm/16 Mm/20 Mm/25 Mm/30 Mm. m6 Washer Diameter 12 Mm, Thickness 1.4 Mm. m6 Spring Washer Diameter 10.36 Mm, Thickness 1.88 Mm. m6 Flange Nut Small Diameter 10 Mm, Large Diameter 14 Mm, Thickness 5.9 Mm

Wide Application: Flange Bolts Kits Are Used In A Wide Variety Of Applications, Such As Fixing Machinery And Equipment, Fixing Building Structures, And Also Fixing Tyres, Among Many Other Usage Scenarios. These Bolts Are An Important Part Of Any Project That Requires Stability And Security

High-Quality: The Flange Bolts Kit Is Made Of High-Quality Class 10.9 Alloy Steel, Which Has High Strength, High Hardness, And Is Corrosion-Resistant To A Certain Extent, Making The Fasteners Durable. Help With Any Project That Requires Stability And Security

Flange Hex Head Design: The Flange Surface Of The Flange Bolt Increases The Touch Area, Making It A Very Strong Structure That Can Withstand High Pressure, Prevent Loosening, High Temperature And Other Extreme Environmental Challenges, And Is Not Easily Damaged

Convenient Storage: Flange Head Screw Flange Nuts,washers And Lock Spring Washers Assortment Kits Are Stored Individually By Type In A Portable, Transparent Case For Easy Storage And Use, Thus Avoiding Loss Or Confusion During Use

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#TOP 3

208 Pcs M6 Nuts and Bolts Set, Hex Serrated Flange Bolts and Nuts Set, Metric Flanged Hex Head Bolts and Nuts Assortment Kit, Black Assorted Machine Screws Flange Nuts Lock and Flat Washers Set (M6)

MYHongLe

HLMY-001-066

Black

208 Pcs M6 Nuts and Bolts Set, Hex Serrated Flange Bolts and Nuts Set, Metric Flanged Hex Head Bolts and Nuts Assortment Kit, Black Assorted Machine Screws Flange Nuts Lock and Flat Washers Set (M6)

9.5

FTB Score

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Features

Flanged Hex Head Bolts And Nuts Set: Flange Bolts Set Adopting The Outer Hexagonal Flange Design, The Force Is Evenly Distributed, No Offset, Not Easy To Slip, And The Fixed Thread Will Be Able To Obtain A Good Grip

Exquisite Materials: M6 Bolts Set Is Made Of High-Quality Carbon Steel, With Exquisite Workmanship, Anti-Oxidation, Corrosion Resistance, High Hardness, High Strength, Not Easy To Rust, And Long-Lasting Durability And Stability

Widely Used: Ideal For Home, Electrical Products, Instruments, Furniture, Television, Engineering, Construction, Trams, Automobiles, Machine Tools, Pipeline Installation, Equipment, Steel Frame Houses, And Other Fields

Package Includes: 208 Pieces In Total, Including 10 Pcs m6x12mm, 10 Pcs m6x16mm, 10 Pcs m6x20mm, 10 Pcs m6x25mm, 10 Pcs m6x30mm, 2 Pcs m6x35mm, 52 Pcs Flanged Nuts, 52 Pcs m6 Lock Washers, 52 Pcs m6 Flat Washers, The Quantity Meets The Needs Of Daily Use

Flange Nuts & Flat Washers & Lock Washers: Flange Bolts And Nuts Are Equipped With Flange Nuts And Lock Washers And Flat Washers, Which Have The Functions Of Distributing Loads, Preventing Loosening, Protecting Bolts, And Extending Service Life

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#TOP 4

Vifmy 320 Piece M6-1.0 and M8-1.25 Flange Hex Head Screw Bolts Assortment Kit with Serrated Flange Nuts,Washers & Lock Spring Washers,Class 10.9 Alloy Steel Black Oxide Finish Plated

Vifmy

FB-001

Black

Metric M6 M8

Vifmy 320 Piece M6-1.0 and M8-1.25 Flange Hex Head Screw Bolts Assortment Kit with Serrated Flange Nuts,Washers & Lock Spring Washers,Class 10.9 Alloy Steel Black Oxide Finish Plated

9.4

FTB Score

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Features

[M6 Quantity] There Are 10 Pcs Of M6-12mm Metric Flange Bolts, 8 Pcs Each Of M6-16/20/25/30 Mm, 42 Pcs Each Of Flat Washers/spring Washers/flange Nuts, And A Total Of 168 Pcs Of M6 Size.

[Flange Bolts Assortment Kit] There Are 320 Products In This Set, Which Contains M6 Size Flange Bolts (12/16/20/25/30 Mm), Flange Serrated Nuts, Washers And Spring Washers, And M8 Size Flange Bolts (16/20/25/30 Mm), Flange Serrated Nuts, Washers And Spring Washers.

[M8 Quantity] There Are 14 Pcs Each Of M8-16/20 Mm Flange Bolts,6 Pcs Of M8-25mm,4 Pcs Of M8-30 Mm,38 Pcs Each Of Flat Washers/spring Washers/flange Nuts,and A Total Of 152 Pcs Of M8 Size.

[High-Quality] The Black Flange Bolts Kit Is Made Of High-Quality Class 10.9 Alloy Steel, Which Has High Strength, High Hardness, And Is Corrosion-Resistant To A Certain Extent, Making The Fasteners Durable. Help With Any Project That Requires Stability And Security.

[Convenient Storage & Wide Application] Flange Bolts Kits Are Used In A Wide Variety Of Applications, Such As Fixing Machinery And Equipment, Fixing Building Structures, And Also Fixing Tyres, Among Many Other Usage Scenarios. These Bolts Are An Important Part Of Any Project That Requires Stability And Security.Flange Bolts Assortment Kits Are Stored Individually By Type In A Portable, Transparent Case For Easy Storage And Use.

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#TOP 5

Drenky M4 Bolts, Stainless Steel M4 X 10mm Socket Flanged Button Screws, 304 Stainless Steel Hexagon Socket Pan Head, Fully Thread Machine Screws, Rustproof (Pack of 50)

Drenky

JMS0410-50

50 pcs

M4x10mm, 50 Pcs

Drenky M4 Bolts, Stainless Steel M4 X 10mm Socket Flanged Button Screws, 304 Stainless Steel Hexagon Socket Pan Head, Fully Thread Machine Screws, Rustproof (Pack of 50)

9.2

FTB Score

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Features

Flanged Button Head Screws: The Flange Replaces The Separate Washer, Which Increases The Contact Surface Between The Screw Head And The Product And Reduces The Pressure. The Surface Of The Product Is Protected From Damage.

304 Stainless Steel: Hexagon Socket Screws Are Made Of 304 Stainless Steel, Burr-Free And Hardened. Flanged Button Head Screws Are Corrosion And Rust Resistant And Can Be Used Outdoors Or In Damp Environments.

Package Content: 50 X Hexagon Socket Screws. (Machine Screws Have A Hexagon Socket Drive. This Drive Is Ideal For Screw Connections Where The Screw Head Is Difficult To Access Due To The Design).

Dimensions: M4x10mm (thread Length: 10mm), Standard Metric Full Thread. Further Information On The Dimensions Can Be Found In The Dimensional Drawings.

Areas Of Application: In Addition To The Widespread Use Of Hexagon Socket Screws In Mechanical Engineering, Flange Screws Can Also Be Found In Small Hardware Parts And Electrical Products. For Example, Many Pieces Of Furniture Are Fastened With Hexagon Socket Bolts.

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#TOP 6

YIIFLY M10 x 40mm Flanged Hex Head Bolts Flange Hexagon Screws, M10x1.5 bolt,10.9 Grade Alloy Steel, Hexagon Head Bolts, Black Zinc Finish, Full Thread, Quantity 8

YIIFLY

10.9-FLT-M10

Black

M10 x 40mm(8PCS)

YIIFLY M10 x 40mm Flanged Hex Head Bolts Flange Hexagon Screws, M10x1.5 bolt,10.9 Grade Alloy Steel, Hexagon Head Bolts, Black Zinc Finish, Full Thread, Quantity 8

9.2

FTB Score

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Features

Metric M10 Bolts ,Thread Diameter: 10 Mm; Thread Length: 40 Mm; Pitch Size: 1.5 Mm.

M10x1.5 Flanged Hex Head Bolts Flange Hexagon Screws , Serrations Help Grip The Material Surface For Easy Installation And Provide Mild Vibration Resistance.

Package Included: 8 X Flanged Hex Head Bolts (M10 X 40mm Bolts)

Made Of 10.9-Grade Alloy Steel With A Black Zinc Finish, These Bolts Offer Superior Corrosion Resistance And Durability Compared To Standard Black Oxide. The Zinc Plating Provides A Stronger Protective Barrier, Ensuring Long-Lasting Performance, High Hardness, And Exceptional Strength In Demanding Environments.

INTIMATE SERVICE - YIIFLY Focus On Customer Satisfaction, If You Have Any Questions Or Are Not Satisfied, You Can Contact Us By Email, We Will Solve All Your Problems As Soon As Possible.

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#TOP 7

Valorada 20Pcs M5 Bolts, M5 x 20mm Flanged Button Head Screws Bolts, 304 Stainless Steel Furniture Screws, Torx Drive, Fully Threaded with Torx Key

Valorada

Torx Screws

‎Silver

M5 x 20mm

Valorada 20Pcs M5 Bolts, M5 x 20mm Flanged Button Head Screws Bolts, 304 Stainless Steel Furniture Screws, Torx Drive, Fully Threaded with Torx Key

9.2

FTB Score

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Features

Unique Design: The M5 Bolts Feature An Integrated Flange Button Head, Eliminating The Need For Separate Washers. This Design Increases The Contact Area Between The Screw Head And The Object After Installation, Enhancing Equipment Stability And Preventing The Screw Head From Sinking Into The Material. The Head Is Flat, Smooth, And Free Of Sharp Edges, Ensuring Both Safety And Aesthetics

High Strength: These Flange Button Head Bolts Are Made Of 304 Stainless Steel, Featuring A Smooth Surface Free Of Burrs, Precise Threads, And Accurate Dimensions. They Offer Excellent Corrosion Resistance And Tensile Strength, Capable Of Long-Term Operation In Extremely Low Or High Temperatures, Making Them An Ideal Choice For Various Furniture And Industrial Equipment

Wide Application: Flange Button Head Bolts Are Widely Used In Sports Equipment, Industrial Machinery, Automotive Manufacturing And Repair, Furniture, DIY Projects, Cat Trees, Bicycles, And More

Package Contents: Includes 20 M5 X 20mm Stainless Steel Torx Flange Head Bolts And One Torx Key

Easy To Use: The Torx Drive Mechanism Improves Torque Transmission Efficiency, Reduces Required Force, Enhances Stability, Minimizes The Risk Of Stripping, And Lowers The Chance Of Head Deformation

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#TOP 8

YIIFLY M8 x 60mm Flanged Hex Head Bolts Flange Hexagon Screws, M8x1.25 bolt, 304 Stainless Steel(A2-70), Bright Finish, Fully Threaded, Hexagon Head Bolts, Quantity 10

YIIFLY

304-FLT-M8

Silver

60mm(10PCS)

YIIFLY M8 x 60mm Flanged Hex Head Bolts Flange Hexagon Screws, M8x1.25 bolt, 304 Stainless Steel(A2-70), Bright Finish, Fully Threaded, Hexagon Head Bolts, Quantity 10

9.2

FTB Score

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Features

Metric M8 Screws,Thread Diameter: 8 Mm; Thread Length: 60 Mm; Pitch Size: 1.25 Mm.

M8x1.25 Flanged Hex Head Bolts Flange Hexagon Screws , 304 Stainless Steel , High Hardness, Corrosion Resistance, Can Be Used In Humid Environments, And Do Not Worry About Rust.Serrations Help Grip The Material Surface For Easy Installation And Provide Mild Vibration Resistance.

Wide Range Of Applications: Whether For Indoor Or Outdoor Use, Our Stainless Steel Screws Excel In Various Settings. They Are Commonly Used In Machinery, Furniture, Automotive Repairs, And DIY Projects, Catering To The Needs Of Professionals And DIY Enthusiasts.

Package Included: 10 X Flanged Hex Head Bolts (M8 X 60mm Bolts)

INTIMATE SERVICE - YIIFLY Focus On Customer Satisfaction, If You Have Any Questions Or Are Not Satisfied, You Can Contact Us By Email, We Will Solve All Your Problems As Soon As Possible.

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#TOP 9

YIIFLY M10 x 30mm Flanged Hex Head Bolts Flange Hexagon Screws, M10x1.5 bolt, 304 Stainless Steel(A2-70), Bright Finish, Fully Threaded, Hexagon Head Bolts, Quantity 10

YIIFLY

304-FLT-M10

Silver

M10 x 30mm(10PCS)

YIIFLY M10 x 30mm Flanged Hex Head Bolts Flange Hexagon Screws, M10x1.5 bolt, 304 Stainless Steel(A2-70), Bright Finish, Fully Threaded, Hexagon Head Bolts, Quantity 10

9.2

FTB Score

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Features

Metric M10 Bolts ,Thread Diameter: 10 Mm; Thread Length: 30 Mm; Pitch Size: 1.5 Mm.

M10x1.5 Flanged Hex Head Bolts Flange Hexagon Screws , 304 Stainless Steel , High Hardness, Corrosion Resistance, Can Be Used In Humid Environments, And Do Not Worry About Rust.Serrations Help Grip The Material Surface For Easy Installation And Provide Mild Vibration Resistance.

Package Included: 10 X Flanged Hex Head Bolts (M10 X 30mm Bolts)

INTIMATE SERVICE - YIIFLY Focus On Customer Satisfaction, If You Have Any Questions Or Are Not Satisfied, You Can Contact Us By Email, We Will Solve All Your Problems As Soon As Possible.

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#TOP 10

TA-VIGOR M10-1.5 x 25mm Hex Head Serrated Flange Bolts, 10.9 Grade Carbon Steel Flanged Hex Bolts, Heavy Duty Screws for Construction and Machinery, 10Pcs

TA-VIGOR

Black

TA-VIGOR M10-1.5 x 25mm Hex Head Serrated Flange Bolts, 10.9 Grade Carbon Steel Flanged Hex Bolts, Heavy Duty Screws for Construction and Machinery, 10Pcs

9.2

FTB Score

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Features

[High Strength Carbon Steel] Constructed From 10.9 Grade Carbon Steel With A Black Oxide Finish For Excellent Durability, Corrosion Resistance, And Load-Bearing Performance

[M10 Hex Serrated Design] Each Bolt Features A Hex Head With A Built-In Serrated Flange For Firm Grip And Resistance Against Loosening Caused By Vibration Or Torque

[Suitable For Various Applications] Perfect For Assembling Steel Structures, Heavy Machinery, Pipelines, DIY Repairs And General Construction Projects Using Hex Tools

[No Washer Needed] The Flanged Hex Head Distributes Load Evenly Across Surfaces, Helping To Prevent Surface Damage And Ensuring Long-Term Fastening Integrity

[Fully Threaded M10 X 25mm Shaft] These Flange Bolts Offer Precise 1.5mm Pitch Threading, Ideal For Secure Fastening In Structural, Automotive And Industrial Environments

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Frequently Asked Questions (FAQs)

1. What are flange bolts used for?

Hex flange bolts are used on vehicle frames, especially truck frames, and anywhere a hex washer head bolt is needed. The large bearing surface distributes clamping force over a large area, allowing them to be used with irregular and oversized holes.

2. What is a flange bolt?

Flange bolts have a circular flange under the head that acts like a washer to distribute the load. Flange bolts that are non-serrated are sometimes called frame bolts.

3. Do you need a washer with a flange bolt?

Addition of steel washers to a fastener system is recommended to improve translation of torque input into bolt preload. Washers provide a smooth bearing surface, reducing friction between nut and flange. This effect is greatest when washers are through-hardened.

Editor's Notes

During our flange bolt research, we found 195 flange bolt products and shortlisted 10 quality products. We collected and analyzed 2,783 customer reviews through our big data system to write the flange bolts list. We found that most customers choose flange bolts with an average price of £20.00.

The flange bolts are available for purchase. We have researched hundreds of brands and picked the top brands of flange bolts, including Universal Hardware, Vifmy, MYHongLe, Drenky, YIIFLY.

Written by

Corey Phillips

Corey Philips is an electrician and lighting expert. He graduated from the University of Birmingham in 2012 with a Bachelor's degree in electrical and electronics engineering. Corey is a specialist contractor in lights. He sells and installs and recommends lights and lamp sheds, and other lights accessories. Aside from that, Corey is vast in installing and maintaining electrical appliances like air conditioners, water heaters, and the likes.