Best Carbon Steel Hex Bolts of 2026

Corey Phillips Avatar
Corey Phillips
Last Updated: 5 Feb 2026

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Carbon Steel Hex Bolts are high-quality fasteners that are commonly used in construction, automotive, and manufacturing industries. These bolts are made of carbon steel, which is known for its durability and strength. They come in a hexagonal shape with a threaded shaft, making them easy to tighten and loosen with a wrench or pliers. Carbon Steel Hex Bolts are available in various sizes and finishes to suit different applications. They are recommended for use in environments where high strength and resistance to wear and tear are essential.

At a Glance: Our Top Picks

688 Pcs Hex Bolts and Nuts Set, M4 M5 M6 Machine Bolts and Hex Nuts and Lock Washers and Flat Assortment Kit, Carbon Steel Full Thread Cover #TOP 1
688 Pcs Hex Bolts and Nuts Set, M4 M5 M6 Machine Bolts and Hex Nuts and Lock Washers and Flat Assortment Kit, Carbon Steel Full Thread
ftb score rating icon 9.9
Zynthor 50Pcs M4 Bolts, M4 x 10mm Button Head Socket Cap Bolts Screws, Allen Hex Drive, Carbon Steel Cover #TOP 2
Zynthor 50Pcs M4 Bolts, M4 x 10mm Button Head Socket Cap Bolts Screws, Allen Hex Drive, Carbon Steel
ftb score rating icon 9.8
Wavanta M5 Bolts, M5 x 8mm Button Head Screws, Allen Socket Bolts Screws, Carbon Steel 10.9 Grade Cover #TOP 3
Wavanta M5 Bolts, M5 x 8mm Button Head Screws, Allen Socket Bolts Screws, Carbon Steel 10.9 Grade
ftb score rating icon 9.6

Top 10 Carbon Steel Hex Bolts

#TOP 1

688 Pcs Hex Bolts and Nuts Set, M4 M5 M6 Machine Bolts and Hex Nuts and Lock Washers and Flat Assortment Kit, Carbon Steel Full Thread

MYHongLe
HLMY-001-088
Black
M4, M5, M6
688 Pcs Hex Bolts and Nuts Set, M4 M5 M6 Machine Bolts and Hex Nuts and Lock Washers and Flat Assortment Kit, Carbon Steel Full Thread Cover
688 Pcs Hex Bolts and Nuts Set, M4 M5 M6 Machine Bolts and Hex Nuts and Lock Washers and Flat Assortment Kit, Carbon Steel Full Thread with Spring Washers

Features
Hexagonal Bolts: Hexagonal Nuts And Bolts Set Uses A Hexagonal Structure, Which Is Stronger, More Durable And Has A Higher Load Capacity. The Interface Is Tighter, The Connection With The Nut Is Stronger, The Shock Resistance Is Good, And Some Common Loosening Problems Are Solved.
Exquisite Material: Nuts And Bolts Set Are Made Of High-Quality Carbon Steel With Exquisite Workmanship, High Hardness, Corrosion Resistance, Rust Resistance And Oxidation Resistance, Is Not Easy To Break Or Deform During Use, Has Strong Wear Resistance, Is Easy To Disassemble And Is Durable.
Wide Range Of Applications: Widely Used In Construction, Mechanical Engineering, Automobile Manufacturing, Furniture Manufacturing, Aerospace And Other Fields, For Connecting Bearings, Gears, Machine Tools, Couplings And Other Components, And For Fastening And Supporting Building Structures.
Practical Design: The Threads Are Evenly Distributed, The Threads Are Deep And Clear, The Surface Is Smooth And Burr-Free, The Force Is Uniform, It Is Not Easy To Slip During Installation, And The Fastening Performance Is Good. Commonly Used In Various Fields And Plays An Important Role In Various Aspects.
Package Includes: Total 688 Pcs, Including: m4x12mm,m4x16mm,m4x20mm,m4x30mm,m5x16mm,m5x20mm,m5x25mm,m5x30mm,m6x16mm,m6x20mm,m6x25mm,m6x40mm, Including Nuts, Washers, Lock Washers In Appropriate Size And Quantity. Sufficient Amount. Different Sizes Are Available To Meet The Needs Of Different Areas.
#TOP 2

Zynthor 50Pcs M4 Bolts, M4 x 10mm Button Head Socket Cap Bolts Screws, Allen Hex Drive, Carbon Steel

Zynthor
M4 Bolts
Black
M4 x 10mm
Zynthor 50Pcs M4 Bolts, M4 x 10mm Button Head Socket Cap Bolts Screws, Allen Hex Drive, Carbon Steel Cover
Zynthor 50Pcs M4 Bolts, M4 x 10mm Button Head Socket Cap Bolts Screws, Allen Hex Drive, Carbon Steel, Black Oxide, with Hex Spanner

Features
PRODUCT SIZE: Head Style:Button Head Hex Socket Cap, Thread Diameter: 3.8mm; Thread Pitch: 0.7mm; Screw Length: 10mm. Head Diameter: 7.3mm, Just Insert The Screw Into A Pre-Drilled Hole And Turn It By Wrench
HIGH QUALITY M4 BOLT: Zynthor Button Head Bolts, Featured Hex Socket Drive Hole Provides Good Torque Transmission, Well Uniformity Force, Obvious Screw Thread With No Offset, No Residual Burrs, The Perfect Partner For Your Work
WIDELY USE: This Carbon Steel M4 Bolts Is Fit For The Assembly And Repairs Of Bed, Table, Desk, Chair, Crib, Cabinet, Sofa, Car, Bike And Widely Used In Home, Garage, Office, Machinery Industry, Electronics, Construction, Ship Assembly, Automotive Project, Motorcycle Accessories, And Furniture Assembly, DIY Projects
VALUE PACKAGING AND EASY TO USE: You Will Get 50Pcs M4 X 10mm Bolts, Black, A Hex Spanner, They Are Ideal For Use At Home, In The Office Or At Work
RUGGED AND DURABLE: Zynthor Hexagon Socket Head Cap Bolts Are Made From High-Quality 10.9 Grade Carbon Steel With A Black Oxide Finish For Excellent Corrosion And Rust Resistance, Ensuring A Longer Lifespan, Greater Durability, And A Stronger, More Durable Bolt
#TOP 3

Wavanta M5 Bolts, M5 x 8mm Button Head Screws, Allen Socket Bolts Screws, Carbon Steel 10.9 Grade

Wavanta
M5 Bolts
Black
M5 x 8mm
Wavanta M5 Bolts, M5 x 8mm Button Head Screws, Allen Socket Bolts Screws, Carbon Steel 10.9 Grade Cover
Wavanta M5 Bolts, M5 x 8mm Button Head Screws, Allen Socket Bolts Screws, Carbon Steel 10.9 Grade, Black Oxide Finish, Pack of 20

Features
Upgrade Your Fastening Solutions With Our Black Carbon Steel Hex Socket Button Head Bolts Screws. The Black Oxide Layer Provides These Bolts Screws With Superior Strength And Increased Corrosion Resistance, Making Them Ideal For A Wide Range Of Applications. The Hex Socket Drive Ensures Easy And Secure Installation Using An Allen Wrench, While The Button Head Design Offers A Sleek And Finished Appearance
Wavanta M5 Button Head Allen Socket Bolts Screws (20 Pcs + 1 Pcs 3mm Hex Key), High-Strength Carbon Steel Bolts, Thread Size ( Diameter ): 5 Mm, Thread Pitch: 0.8 Mm, Thread Length: 8 Mm, Total Length ( Includes Head ) 10.7 Mm, Screw Head Style: Button Head, Head Diameter: 9 Mm, Head Height: 2.7 Mm Screw Drive Style: Hex Socket Drive, Also Known As Internal Hex Drive, Hex Drive Size: 3mm
These Bolts Screws Are Engineered For Precision And Reliability, Offering Excellent Performance In Machinery, Automotive, Construction, And DIY Projects. The 10.9 Grade Carbon Steel Construction Provides Superior Durability, Ensuring Longevity And Peace Of Mind Even In Demanding Environments. Whether You're A Professional Tradesperson Or A DIY Enthusiast, These Bolts Screws Are A Versatile And Essential Addition To Your Toolkit. Order Our Premium Carbon Steel Bolts
Machinery: These Fully Threaded Carbon Steel Bolts Screws Are Perfect For Securing Components In Machinery And Equipment, Offering Exceptional Strength And Corrosion Resistance. Automotive: Use These Bolts Screws To Fasten Automotive Components, Ensuring Reliable And Durable Performance In Various Automotive Applications. Construction: From Structural Connections To General Fastening Tasks, These Bolts Screws Are An Ideal Choice For Construction Projects That Demand High-Quality And Corrosion-Resistant Fasteners
DIY Projects: Whether You're Building Furniture, Working On Home Improvement Projects, Or Engaging In General Repairs, These Bolts Screws Are Versatile And Reliable For A Wide Range Of DIY Applications. Industrial Applications: From Manufacturing To Maintenance, These Bolts Screws Are Suitable For A Broad Spectrum Of Industrial Uses, Offering Durability And Ease Of Installation For Various Fastening Needs
#TOP 4

Zynthor 50Pcs M4 Bolts, M4 x 30mm Button Head Socket Cap Bolts Screws, Allen Hex Drive, Carbon Steel

Zynthor
M4 Bolts
Black
M4 x 30mm
Zynthor 50Pcs M4 Bolts, M4 x 30mm Button Head Socket Cap Bolts Screws, Allen Hex Drive, Carbon Steel Cover
Zynthor 50Pcs M4 Bolts, M4 x 30mm Button Head Socket Cap Bolts Screws, Allen Hex Drive, Carbon Steel, Black Oxide, with Hex Spanner

Features
PRODUCT SIZE: Head Style:Button Head Hex Socket Cap, Thread Diameter: 3.8mm; Thread Pitch: 0.7mm; Screw Length: 30mm. Head Diameter: 7.3mm, Just Insert The Screw Into A Pre-Drilled Hole And Turn It By Wrench
HIGH QUALITY M4 BOLT: Zynthor Button Head Bolts, Featured Hex Socket Drive Hole Provides Good Torque Transmission, Well Uniformity Force, Obvious Screw Thread With No Offset, No Residual Burrs, The Perfect Partner For Your Work
WIDELY USE: This Carbon Steel M4 Bolts Is Fit For The Assembly And Repairs Of Bed, Table, Desk, Chair, Crib, Cabinet, Sofa, Car, Bike And Widely Used In Home, Garage, Office, Machinery Industry, Electronics, Construction, Ship Assembly, Automotive Project, Motorcycle Accessories, And Furniture Assembly, DIY Projects
VALUE PACKAGING AND EASY TO USE: You Will Get 50Pcs M4 X 30mm Bolts, Black, A Hex Spanner, They Are Ideal For Use At Home, In The Office Or At Work
RUGGED AND DURABLE: Zynthor Hexagon Socket Head Cap Bolts Are Made From High-Quality 10.9 Grade Carbon Steel With A Black Oxide Finish For Excellent Corrosion And Rust Resistance, Ensuring A Longer Lifespan, Greater Durability, And A Stronger, More Durable Bolt
#TOP 5

AMLOOPH M8 Bolts, M8 x 30mm Hex Socket Large Flat Head Carbon Steel Fully Threaded Furniture Screws/Bolts

CM8x30mm
M8x30mm
AMLOOPH M8 Bolts, M8 x 30mm Hex Socket Large Flat Head Carbon Steel Fully Threaded Furniture Screws/Bolts Cover
AMLOOPH M8 Bolts, M8 x 30mm Hex Socket Large Flat Head Carbon Steel Fully Threaded Furniture Screws/Bolts for Chairs, Cots, Beds and Tables (Pack Of 12- and a Wrench)

Features
Pack Contains-– 12 Galvanized Carbon Steel M8 Bolts 30mm And 1 Hex Wrench
M8 Furniture Screws Type –- M8 Large Flat Head Hex Socket Bolts
Wide Application: Large Flat Head Bolts Are Mainly Used For Connecting Various Furniture Or Parts, Such As Crib, Workbench, Bed, Table, Chair, Cabinets, Boards, Cupboards And Other Furnitures.
M8 Hexagon Head Screws Size--Length (L)-30mm, Threaded Diameter (d)-8mm, Hexagon Head (s)-5mm, Head Diameter (dk)-18mm, Head Length (k)-4mm, Pitch-1.25mm
Advantages - These Large Flat Head Screws Provide A Larger Load-Bearing Surface And Are Suitable For Various Sizes Of Holes. They Are Commonly Used As Furniture Screws Or Machine Bolts
#TOP 6

Kozelo 5 Pcs Hex Head Screws Bolts - Carbon Steel Grade 10.9 Fully Threaded Hex Tap Metric Hexagon Head Machine Bolts Right Hand External Hex Drive

Kozelo
klf250411zz000697
Black
M8-1.25x120mm
Kozelo 5 Pcs Hex Head Screws Bolts - Carbon Steel Grade 10.9 Fully Threaded Hex Tap Metric Hexagon Head Machine Bolts Right Hand External Hex Drive Cover
Kozelo 5 Pcs Hex Head Screws Bolts - [M8-1.25x120] Carbon Steel Grade 10.9 Fully Threaded Hex Tap Metric Hexagon Head Machine Bolts Right Hand External Hex Drive, Black

Features
1- PACKAGE CONTENTS - 5 Pcs Of Hex Head Bolts, Thread: Fully Threaded; Head Style: Hex Head; Thread Size: M8-1.25; Thread Length: 120mm; Material: Carbon Steel; Surface Treatment: Black Oxide; Hex Head Bolts Standard: DIN933; Performance Grade: 10.9
2- MATERIAL - Carbon Steel Body, Balancing Strength. Precision-Machined Threads Ensure Secure Engagement In Structural And Machinery Applications, Suitable For Industrial Equipment And Engine Compartments.
3- Work Environment - Cost-Effective Solution For Interior Construction, Machinery Assembly, And General-Purpose Repairs.
4- Applications - A Versatile Fastening Solution For Home, Automotive, And Industrial Use. Furniture Assembly: Beds, Cabinets, And Tables. Automotive Repair: Engine Mounts, Body Panels, And Exhaust Systems. Construction: Steel Frames, Guardrails, And Pipeline Installations. DIY Projects: Machinery, Equipment Fixing, And Metal Crafts.
5- TAKE NOTICE OF - Before Purchase, Confirm Correct Size Needed. Use Caliper,gauge Checker For Measurement; Avoid Ruler Or Tape Measure.
#TOP 7

PATIKIL M3 x 8 mm Flat Head Socket Cap Screws, 100 Pack Flat Countersunk Bolts Medium Carbon Steel Hex Socket Drive Machine Screws Full Thread Black Oxide Grade 10.9

pta241004tt001203eu
M3 x 8 mm
PATIKIL M3 x 8 mm Flat Head Socket Cap Screws, 100 Pack Flat Countersunk Bolts Medium Carbon Steel Hex Socket Drive Machine Screws Full Thread Black Oxide Grade 10.9 Cover
PATIKIL M3 x 8 mm Flat Head Socket Cap Screws, 100 Pack Flat Countersunk Bolts Medium Carbon Steel Hex Socket Drive Machine Screws Full Thread Black Oxide Grade 10.9

Features
Premium Hex Drive Machine Screws: Made Of Durable Medium Carbon Steel With A Corrosion-Resistant Black Oxide Finish, Strength Level Is 10.9 Grade, Wear-Resistant, Providing Good Strength And Corrosion Resistance In Bad Environments
Thread Size: M3 X 8 Mm; Outside Diameter: 6 Mm / 0.24 Inch; Length: 8 Mm / 0.31 Inch; Pitch: 0.5 Mm / 0.02 Inch; Quantity: 100 Pcs X Flat Head Socket Cap Screws
Instruction: All Screws Are Coated With Anti-Rust Oil To Provide Better Performance. (NOTE: Please Confirm The Size Before Placing An Order.)
Good Stability & Beautifully Surface: Hex Drive Countersunk Bolts With Clear Threads, Provide Stability And Can Be Used For A Long Time. Beautifully Cut And The Head Is Flat. Provide A Good Decoration, Easy To Use And Install
Application: Flat Countersunk Screw Is Suitable For Power, Aerospace, Office Equipment, Petrochemical, Electronics, Communications, Shipbuilding Industry, Machinery, Etc. You Can Also See Them In Construction, Manufacturing, Engineering, Assembling, Landlord, Repairmen, And Other DIY Projects
#TOP 8

TA-VIGOR 5Pcs M8 x 25mm Hex Flange Bolts, 10.9 Grade Carbon Steel Hex Head Screws

Black
TA-VIGOR 5Pcs M8 x 25mm Hex Flange Bolts, 10.9 Grade Carbon Steel Hex Head Screws Cover
TA-VIGOR 5Pcs M8 x 25mm Hex Flange Bolts, 10.9 Grade Carbon Steel Hex Head Screws, Flanged Hexagon Bolts for Construction, Machine Tools, and DIY Projects Black

Features
Corrosion-Resistant Black Oxide Coating: The Black Oxide Finish Provides Enhanced Resistance Against Rust And Wear, Making These Bolts Reliable For Both Indoor And Outdoor Applications
Premium 10.9 Grade Carbon Steel Construction: These M8x25mm Hex Flange Bolts Are Made From High-Quality 10.9 Grade Carbon Steel, Delivering Outstanding Strength And Durability For Heavy-Duty Use
Versatile For Multiple Projects: Ideal For Guardrail Fixing, Equipment Assembly, Home Appliance Repair, Construction Work, And General-Purpose DIY Fastening Across Various Materials
Precision Threading And Easy Installation: Manufactured To Metric Standards With A 1.25mm Pitch, These Bolts Ensure Smooth Fastening Into Pre-Threaded Holes Or Use With Hex Nuts Using A Standard Wrench
Built-In Flange For Secure Load Distribution: The Integrated Flange Design Acts Like A Washer, Evenly Distributing Pressure And Preventing Loosening In DIY, Machinery, And Pipeline Installations
#TOP 9

Wavanta M6 Bolts, M6 x 35mm Button Head Screws, Allen Socket Bolts Screws, Carbon Steel 10.9 Grade

Wavanta
M6 Bolts
Black
M6 x 35mm
Wavanta M6 Bolts, M6 x 35mm Button Head Screws, Allen Socket Bolts Screws, Carbon Steel 10.9 Grade Cover
Wavanta M6 Bolts, M6 x 35mm Button Head Screws, Allen Socket Bolts Screws, Carbon Steel 10.9 Grade, Black Oxide Finish, Pack of 20

Features
Upgrade Your Fastening Solutions With Our Black Carbon Steel Hex Socket Button Head Bolts Screws. The Black Oxide Layer Provides These Bolts Screws With Superior Strength And Increased Corrosion Resistance, Making Them Ideal For A Wide Range Of Applications. The Hex Socket Drive Ensures Easy And Secure Installation Using An Allen Wrench, While The Button Head Design Offers A Sleek And Finished Appearance
Wavanta M6 Button Head Allen Socket Bolts Screws (20 Pcs + 1 Pcs 4mm Hex Key), High-Strength Carbon Steel Bolts, Thread Size ( Diameter ): 6mm, Thread Pitch: 1mm, Thread Length: 35mm, Total Length ( Includes Head ) 38.2mm, Screw Head Style: Button Head, Head Diameter: 10.2mm, Head Height: 3.2mm Screw Drive Style: Hex Socket Drive, Also Known As Internal Hex Drive, Hex Drive Size: 4mm
These Bolts Screws Are Engineered For Precision And Reliability, Offering Excellent Performance In Machinery, Automotive, Construction, And DIY Projects. The 10.9 Grade Carbon Steel Construction Provides Superior Durability, Ensuring Longevity And Peace Of Mind Even In Demanding Environments. Whether You're A Professional Tradesperson Or A DIY Enthusiast, These Bolts Screws Are A Versatile And Essential Addition To Your Toolkit. Order Our Premium Carbon Steel Bolts
Machinery: These Fully Threaded Carbon Steel Bolts Screws Are Perfect For Securing Components In Machinery And Equipment, Offering Exceptional Strength And Corrosion Resistance. Automotive: Use These Bolts Screws To Fasten Automotive Components, Ensuring Reliable And Durable Performance In Various Automotive Applications. Construction: From Structural Connections To General Fastening Tasks, These Bolts Screws Are An Ideal Choice For Construction Projects That Demand High-Quality And Corrosion-Resistant Fasteners
DIY Projects: Whether You're Building Furniture, Working On Home Improvement Projects, Or Engaging In General Repairs, These Bolts Screws Are Versatile And Reliable For A Wide Range Of DIY Applications. Industrial Applications: From Manufacturing To Maintenance, These Bolts Screws Are Suitable For A Broad Spectrum Of Industrial Uses, Offering Durability And Ease Of Installation For Various Fastening Needs
#TOP 10

Wavanta M6 Bolts, M6 x 60mm Button Head Screws, Allen Socket Bolts Screws, Carbon Steel 10.9 Grade

Wavanta
M6 Bolts
Black
M6 x 60mm
Wavanta M6 Bolts, M6 x 60mm Button Head Screws, Allen Socket Bolts Screws, Carbon Steel 10.9 Grade Cover
Wavanta M6 Bolts, M6 x 60mm Button Head Screws, Allen Socket Bolts Screws, Carbon Steel 10.9 Grade, Black Oxide Finish, Pack of 20

Features
Upgrade Your Fastening Solutions With Our Black Carbon Steel Hex Socket Button Head Bolts Screws. The Black Oxide Layer Provides These Bolts Screws With Superior Strength And Increased Corrosion Resistance, Making Them Ideal For A Wide Range Of Applications. The Hex Socket Drive Ensures Easy And Secure Installation Using An Allen Wrench, While The Button Head Design Offers A Sleek And Finished Appearance
Wavanta M6 Button Head Allen Socket Bolts Screws (20 Pcs + 1 Pcs 4mm Hex Key), High-Strength Carbon Steel Bolts, Thread Size ( Diameter ): 6mm, Thread Pitch: 1mm, Thread Length: 60mm, Total Length ( Includes Head ) 63.2mm, Screw Head Style: Button Head, Head Diameter: 10.2mm, Head Height: 3.2mm Screw Drive Style: Hex Socket Drive, Also Known As Internal Hex Drive, Hex Drive Size: 4mm
These Bolts Screws Are Engineered For Precision And Reliability, Offering Excellent Performance In Machinery, Automotive, Construction, And DIY Projects. The 10.9 Grade Carbon Steel Construction Provides Superior Durability, Ensuring Longevity And Peace Of Mind Even In Demanding Environments. Whether You're A Professional Tradesperson Or A DIY Enthusiast, These Bolts Screws Are A Versatile And Essential Addition To Your Toolkit. Order Our Premium Carbon Steel Bolts
Machinery: These Fully Threaded Carbon Steel Bolts Screws Are Perfect For Securing Components In Machinery And Equipment, Offering Exceptional Strength And Corrosion Resistance. Automotive: Use These Bolts Screws To Fasten Automotive Components, Ensuring Reliable And Durable Performance In Various Automotive Applications. Construction: From Structural Connections To General Fastening Tasks, These Bolts Screws Are An Ideal Choice For Construction Projects That Demand High-Quality And Corrosion-Resistant Fasteners
DIY Projects: Whether You're Building Furniture, Working On Home Improvement Projects, Or Engaging In General Repairs, These Bolts Screws Are Versatile And Reliable For A Wide Range Of DIY Applications. Industrial Applications: From Manufacturing To Maintenance, These Bolts Screws Are Suitable For A Broad Spectrum Of Industrial Uses, Offering Durability And Ease Of Installation For Various Fastening Needs
Buying Guide Image
Editor's Notes

During our carbon steel hex bolt research, we found 306 carbon steel hex bolt products and shortlisted 10 quality products. We collected and analyzed 3,378 customer reviews through our big data system to write the carbon steel hex bolts list. We found that most customers choose carbon steel hex bolts with an average price of £20.00.

The carbon steel hex bolts are available for purchase. We have researched hundreds of brands and picked the top brands of carbon steel hex bolts, including MYHongLe, Zynthor, Wavanta, AMLOOPH, Kozelo.

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.