Best Carbon Steel Flange Nuts of 2026

Corey Phillips Avatar
Corey Phillips
Last Updated: 5 Feb 2026

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Carbon steel flange nuts are a type of fastener used in various industrial applications. They are made from high-quality carbon steel and feature a flange at the base that helps to distribute the load and prevent the nut from loosening. These nuts are suitable for use in high-stress environments and are resistant to corrosion and rust. They come in a range of sizes and are easy to install using standard tools. Carbon steel flange nuts are a reliable and durable choice for any project that requires a secure and stable connection.

At a Glance: Our Top Picks

PATIKIL M14x1.5mm Serrated Flange Hex Lock Nuts, 5Pcs Metric Fine Thread Carbon Steel Non-Slip Hexagon Flange Nut Fasteners Cover #TOP 1
PATIKIL M14x1.5mm Serrated Flange Hex Lock Nuts, 5Pcs Metric Fine Thread Carbon Steel Non-Slip Hexagon Flange Nut Fasteners
ftb score rating icon 9.8
sourcing map Hex Serrated Flange Lock Nuts Cover #TOP 2
sourcing map Hex Serrated Flange Lock Nuts
ftb score rating icon 9.7
HOPESPANNER 5 Pcs M6 Car Flange Nuts Carbon Steel Flat Hex Lock Flange Nuts Non-Slip Lock Flange Black Cover #TOP 3
HOPESPANNER 5 Pcs M6 Car Flange Nuts Carbon Steel Flat Hex Lock Flange Nuts Non-Slip Lock Flange Black
ftb score rating icon 9.5

Top 10 Carbon Steel Flange Nuts

#TOP 1

PATIKIL M14x1.5mm Serrated Flange Hex Lock Nuts, 5Pcs Metric Fine Thread Carbon Steel Non-Slip Hexagon Flange Nut Fasteners

pta250527tt001628
Silver
M14x1.5mm
PATIKIL M14x1.5mm Serrated Flange Hex Lock Nuts, 5Pcs Metric Fine Thread Carbon Steel Non-Slip Hexagon Flange Nut Fasteners Cover
PATIKIL M14x1.5mm Serrated Flange Hex Lock Nuts, 5Pcs Metric Fine Thread Carbon Steel Non-Slip Hexagon Flange Nut Fasteners for Machinery Manufacturing Industrial DIY Use, Silver

Features
These Metric Fine Threaded Flange Hexagonal Nuts Are Common Fastening Components With Wide Applications. They Are Usually Used Together With Machine Screws, Power Tools, Bolts, Screws And Other Components With External Threads. It Is Applicable To Chandeliers, Lamps, Switches, Electrical Equipment, Mechanical Maintenance Or Repair, DIY Projects, Etc.
Specification: Color: Silver; Material: Zinc Plated Carbon Steel; Thread Size: M14x1.5; Flange Outer Diameter: 28mm / 1.1 Inch; Hex Width: 21mm / 0.83 Inch; Height: 13.2mm / 0.52 Inch; Packing List: 5Pcs X Serrated Flange Hex Lock Nuts
Note: Please Confirm The Thread Of These Hex Nuts.
Instruction: Easy To Use, Directly Screw The Hex Nuts On Bolts Or Screws For Fastening The Parts. Due To The Serrations, They Cannot Be Used With Washers Or On Surfaces That Cannot Be Scratched. The External Hexagonal Design Provides A Sturdy Handle, Perfectly Matching Various Open-End Wrenches And Simplifying The Installation And Disassembly.
Advantage: Adopting Fine Techniques, The Threads Are Deep And Clear. The Force Is Evenly Distributed, And The Connection Is More Secure. The Surface Galvanizing Treatment Makes The Hexagonal Nut With Excellent Corrosion Resistance, Long Service Life, And Can Meet Your Needs. The Serrated Shape Of The Flange Provides A Locking Action And Also Helps Avoid Nut Vibration And Increases Nut Retention. The Serrations Are Angled To Prevent The Nut From Rotating In The Direction Of Loosening The Nut.

sourcing map Hex Serrated Flange Lock Nuts

a18091200ux0096
Silver
5/16"-18(10 pcs)
sourcing map Hex Serrated Flange Lock Nuts Cover
sourcing map 5/16-18 Serrated Flange Hex Lock Nuts, Carbon Steel 10 Pcs

The sourcing map Flange Lock Nuts are designed for reliable fastening with their hex serrated flange features. The 5/16" thread diameter and 18 threads per inch ensure a secure fit, giving you peace of mind in your projects. With a flange diameter of 17mm, these nuts provide extra surface area for improved grip. Constructed from durable carbon steel with a zinc plated finish, they offer excellent rust resistance, making them suitable for various environments. Enjoy the convenience of self-locking serrated flanges that help prevent loosening over time.

What We Like
Durable carbon steel construction
Rust-resistant zinc plated finish
Self-locking feature for security
Wide flange for better grip
#TOP 3

HOPESPANNER 5 Pcs M6 Car Flange Nuts Carbon Steel Flat Hex Lock Flange Nuts Non-Slip Lock Flange Black

HOPESPANNER
250117hoape002383eu
Black
HOPESPANNER 5 Pcs M6 Car Flange Nuts Carbon Steel Flat Hex Lock Flange Nuts Non-Slip Lock Flange Black Cover
HOPESPANNER 5 Pcs M6 Car Flange Nuts Carbon Steel Flat Hex Lock Flange Nuts Non-Slip Lock Flange Black for Car Motorcycle

Features
Advantage: With Good Sealing Performance, It Can Effectively Prevent Dust Such As Rainwater And Moisture From Entering The Nut Body, Prevent The Nut Body From Corroding, And Prolong The Service Life.
Application: Widely Used In Automobiles, Motorcycles.
Size:Thread Size:M6 , Outer Diameter:12.95mm/0.51", Thickness:5.4mm/0.21"
Package Contents:5 Pcs Flange Nuts.
Material:Carbon Steel, High Strength, Anti-Corrosion And Anti-Rust, Durable.
#TOP 4

TOP-VIGOR M12 Flange Hex Lock Nuts, 5pcs Grade 10.9 Carbon Steel Black Oxide Finish

Black
TOP-VIGOR M12 Flange Hex Lock Nuts, 5pcs Grade 10.9 Carbon Steel Black Oxide Finish Cover
TOP-VIGOR M12 Flange Hex Lock Nuts, 5pcs Grade 10.9 Carbon Steel Black Oxide Finish, Heavy Duty Black Nuts for Machinery, Equipment, Pipe Fittings Automotive

Features
[Tight And Secure Fit] Precisely Machined With M12 X 1.75mm Threads, Our Hex Lock Nuts Ensure A Snug And Stable Hold Across A Wide Range Of Applications
[Durable Carbon Steel Build] These M12 Flange Nuts Are Made From Grade 10.9 Carbon Steel For Outstanding Strength And Long-Term Reliability In Heavy-Duty Fastening Jobs
[Versatile Use Case] These Flange Hex Lock Nuts Are Perfect For Automotive, Industrial, Pipe Connection, Equipment Repair, And General Mechanical Projects
[Integrated Flange Design] The Built-In Flange Increases Surface Contact And Distributes Pressure Evenly, Helping Reduce Loosening Due To Vibration
[Corrosion-Resistant Finish] Coated With Black Oxide, Each Black Nut Resists Rust And Wear, Making It Ideal For Indoor And Outdoor Machinery Setups
#TOP 5

PATIKIL M12x1mm Serrated Flange Hex Lock Nuts, 10Pcs Metric Fine Thread Carbon Steel Non-Slip Hexagon Flange Nut Fasteners

pta250527tt001626
M12x1mm
PATIKIL M12x1mm Serrated Flange Hex Lock Nuts, 10Pcs Metric Fine Thread Carbon Steel Non-Slip Hexagon Flange Nut Fasteners Cover
PATIKIL M12x1mm Serrated Flange Hex Lock Nuts, 10Pcs Metric Fine Thread Carbon Steel Non-Slip Hexagon Flange Nut Fasteners for Machinery Manufacturing Industrial DIY Use, Silver

Features
These Metric Fine Threaded Flange Hexagonal Nuts Are Common Fastening Components With Wide Applications. They Are Usually Used Together With Machine Screws, Power Tools, Bolts, Screws And Other Components With External Threads. It Is Applicable To Chandeliers, Lamps, Switches, Electrical Equipment, Mechanical Maintenance Or Repair, DIY Projects, Etc.
Specification: Color: Silver; Material: Zinc Plated Carbon Steel; Thread Size: M12x1; Flange Outer Diameter: 23mm / 0.91 Inch; Hex Width: 17.9mm / 0.7 Inch; Height: 9.6mm / 0.38 Inch; Packing List: 10Pcs X Serrated Flange Hex Lock Nuts
Note: Please Confirm The Thread Of These Hex Nuts.
Instruction: Easy To Use, Directly Screw The Hex Nuts On Bolts Or Screws For Fastening The Parts. Due To The Serrations, They Cannot Be Used With Washers Or On Surfaces That Cannot Be Scratched. The External Hexagonal Design Provides A Sturdy Handle, Perfectly Matching Various Open-End Wrenches And Simplifying The Installation And Disassembly.
Advantage: Adopting Fine Techniques, The Threads Are Deep And Clear. The Force Is Evenly Distributed, And The Connection Is More Secure. The Surface Galvanizing Treatment Makes The Hexagonal Nut With Excellent Corrosion Resistance, Long Service Life, And Can Meet Your Needs. The Serrated Shape Of The Flange Provides A Locking Action And Also Helps Avoid Nut Vibration And Increases Nut Retention. The Serrations Are Angled To Prevent The Nut From Rotating In The Direction Of Loosening The Nut.
#TOP 6

PATIKIL M10x1mm Serrated Flange Hex Lock Nuts, 25Pcs Metric Fine Thread Carbon Steel Non-Slip Hexagon Flange Nut Fasteners

pta250527tt001625
M10x1mm
PATIKIL M10x1mm Serrated Flange Hex Lock Nuts, 25Pcs Metric Fine Thread Carbon Steel Non-Slip Hexagon Flange Nut Fasteners Cover
PATIKIL M10x1mm Serrated Flange Hex Lock Nuts, 25Pcs Metric Fine Thread Carbon Steel Non-Slip Hexagon Flange Nut Fasteners for Machinery Manufacturing Industrial DIY Use, Silver

Features
These Metric Fine Threaded Flange Hexagonal Nuts Are Common Fastening Components With Wide Applications. They Are Usually Used Together With Machine Screws, Power Tools, Bolts, Screws And Other Components With External Threads. It Is Applicable To Chandeliers, Lamps, Switches, Electrical Equipment, Mechanical Maintenance Or Repair, DIY Projects, Etc.
Specification: Color: Silver; Material: Zinc Plated Carbon Steel; Thread Size: M10x1; Flange Outer Diameter: 19mm / 0.75 Inch; Hex Width: 13.9mm / 0.55 Inch; Height: 8.6mm / 0.34 Inch; Packing List: 25Pcs X Serrated Flange Hex Lock Nuts
Note: Please Confirm The Thread Of These Hex Nuts.
Instruction: Easy To Use, Directly Screw The Hex Nuts On Bolts Or Screws For Fastening The Parts. Due To The Serrations, They Cannot Be Used With Washers Or On Surfaces That Cannot Be Scratched. The External Hexagonal Design Provides A Sturdy Handle, Perfectly Matching Various Open-End Wrenches And Simplifying The Installation And Disassembly.
Advantage: Adopting Fine Techniques, The Threads Are Deep And Clear. The Force Is Evenly Distributed, And The Connection Is More Secure. The Surface Galvanizing Treatment Makes The Hexagonal Nut With Excellent Corrosion Resistance, Long Service Life, And Can Meet Your Needs. The Serrated Shape Of The Flange Provides A Locking Action And Also Helps Avoid Nut Vibration And Increases Nut Retention. The Serrations Are Angled To Prevent The Nut From Rotating In The Direction Of Loosening The Nut.
#TOP 7

TOP-VIGOR M10 Flange Hex Lock Nuts, 2pcs Grade 10.9 Carbon Steel Black Oxide Finish

Black
TOP-VIGOR M10 Flange Hex Lock Nuts, 2pcs Grade 10.9 Carbon Steel Black Oxide Finish Cover
TOP-VIGOR M10 Flange Hex Lock Nuts, 2pcs Grade 10.9 Carbon Steel Black Oxide Finish, Heavy Duty Black Nuts for Machinery, Equipment, Pipe Fittings Automotive

Features
[Tight And Secure Fit] Precisely Machined With M10 X 1.5mm Threads, Our Hex Lock Nuts Ensure A Snug And Stable Hold Across A Wide Range Of Applications
[Durable Carbon Steel Build] These M10 Flange Nuts Are Made From Grade 10.9 Carbon Steel For Outstanding Strength And Long-Term Reliability In Heavy-Duty Fastening Jobs
[Versatile Use Case] These Flange Hex Lock Nuts Are Perfect For Automotive, Industrial, Pipe Connection, Equipment Repair, And General Mechanical Projects
[Integrated Flange Design] The Built-In Flange Increases Surface Contact And Distributes Pressure Evenly, Helping Reduce Loosening Due To Vibration
[Corrosion-Resistant Finish] Coated With Black Oxide, Each Black Nut Resists Rust And Wear, Making It Ideal For Indoor And Outdoor Machinery Setups
#TOP 8

sourcing map 5/8-11 Flange Hex Nuts, 2pcs Grade 10.9 Carbon Steel Black Oxide Finished Hex Flange Nuts

a23022700ux0549
Black
5/8-11UNC
sourcing map 5/8-11 Flange Hex Nuts, 2pcs Grade 10.9 Carbon Steel Black Oxide Finished Hex Flange Nuts Cover
sourcing map 5/8-11 Flange Hex Nuts, 2pcs Grade 10.9 Carbon Steel Black Oxide Finished Hex Flange Nuts for Machinery

Features
Height: 22mm / 0.87"; Hex Width: 26mm / 1.02"; Flange Diameter: 35mm / 1.38"; Package Content: 2pcs X Hex Flange Nuts
Product Name: Flange Hex Nut; Grade: 10.9; Thread Size: 5/8-11
Material: A Flange Hex Nut Is Made Of Carbon Steel, A Black Oxide Finish That Has The Function Of Rust Prevention, Corrosion Resistance, High Strength, Durable.
Application: Hex Flange Nut Mainly Plays The Role Of Increasing The Contact Surface With The Workpiece, Which Is Used In Pipeline Connection Or The Workpiece That Needs To Increase The Contact Surface Of The Nut. Also Widely Used In Machinery, Generators, Home Appliances And Other Projects.
Advantages: One End Of The Flange Nut Has A Wide Flange, Which Increases The Bearing Surface Of The Nut And Is Not Easy To Loose, Increasing The Firmness Of The Connecting Parts.

185 Pcs Stainless Steel Flange Nuts Set

SZSLMY
001-12
silver
185 Pcs Stainless Steel Flange Nuts Set Cover
185 Pcs Hex Flange Nuts, Serrated Flange Hex Nuts, Serrated Flange Nuts, Flanged Lock Nuts, Stainless Steel Serrated Nut, Universal Locknuts for Furniture Construction, M3 M4 M5 M6 M8 M10 M12

The SZSLMY Flange Nuts offer exceptional durability as they are made from high-quality stainless steel, ensuring they are wear-resistant and rust-resistant. Their unique flange and ratchet design enhance fastening strength and prevent loosening caused by vibration, giving you peace of mind during use. With no need for additional gaskets, these nuts simplify your projects, making them ideal for various applications, from furniture making to automotive repairs. This set provides a wide range of sizes to meet your diverse needs.

What We Like
Durable stainless steel construction
Enhanced fastening strength
No gaskets required
Wide range of sizes
Versatile applications
#TOP 10

TOP-VIGOR M12 Flange Hex Nuts, 5 Grade 12.9 Carbon Steel Lock Nuts

Black
TOP-VIGOR M12 Flange Hex Nuts, 5 Grade 12.9 Carbon Steel Lock Nuts Cover
TOP-VIGOR M12 Flange Hex Nuts, 5 Grade 12.9 Carbon Steel Lock Nuts with Black Oxide Finish, Heavy Duty Flange Thread Nut for Machinery and Automotive

Features
[Convenient 5-Pack Value]Includes 5 Pieces Of M12 Flange Nuts, Offering A Cost-Effective Solution For Maintenance Kits, Toolboxes, And Repair Projects
[Heavy Duty M12 Nuts]These M12 Flange Hex Nuts Are Made From Premium 12.9 Grade Carbon Steel, Offering High Strength And Durability For Demanding Mechanical And Industrial Applications
[Versatile Fit For Equipment]Perfect For Connecting Bolts And Studs In Machinery, Generators, Vehicles, And Other Equipment Requiring A Secure Threaded Connection
[Secure Flange Thread Design]Each Nut Features A Built-In Wide Flange That Distributes Pressure And Locks Firmly Into Place, Helping Prevent Loosening Due To Vibration Or Movement
[Black Oxide Protection]Finished With A Black Oxide Coating To Improve Corrosion Resistance And Provide A Sleek, Non-Reflective Appearance—ideal For Long-Term Use
Buying Guide Image
Editor's Notes

During our carbon steel flange nut research, we found 193 carbon steel flange nut products and shortlisted 10 quality products. We collected and analyzed 3,082 customer reviews through our big data system to write the carbon steel flange nuts list. We found that most customers choose carbon steel flange nuts with an average price of £20.00.

The carbon steel flange nuts are available for purchase. We have researched hundreds of brands and picked the top brands of carbon steel flange nuts, including PATIKIL, sourcing map, HOPESPANNER, TOP-VIGOR, SZSLMY.

Written by
Corey Phillips Avatar

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.