Best Domed Carriage Bolts of 2025

Corey Phillips Avatar
Corey Phillips
Last Updated: 1 Feb 2025

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Domed Carriage Bolts are a type of fastener used in various applications to connect wood, metal, and other materials. These bolts are characterized by their dome-shaped heads and square necks, which prevent them from turning once installed. The bolts are available in different sizes and materials, including steel, stainless steel, and brass. With their unique design and high-strength properties, Domed Carriage Bolts are an excellent choice for projects that require a secure and stable connection.

At a Glance: Our Top Picks

TIMCO BZP Carriage Bolt and Hex Nut Cover #TOP 1
TIMCO BZP Carriage Bolt and Hex Nut
ftb score rating icon 9.9
TIMCO BZP Carriage Bolt and Hex Nut Cover #TOP 2
TIMCO BZP Carriage Bolt and Hex Nut
ftb score rating icon 9.8
Carriage Bolt & Nut ZP M8 x 150mm Bag 10 Cover #TOP 3
Carriage Bolt & Nut ZP M8 x 150mm Bag 10
ftb score rating icon 9.6

Top 10 Domed Carriage Bolts

#TOP 1

TIMCO BZP Carriage Bolt and Hex Nut

08180CBP
Silver
8x180
TIMCO BZP Carriage Bolt and Hex Nut Cover
TIMCO BZP Carriage Bolt and Hex Nut - M8 x 180 - Zinc - Pack of 2

Features
Ideal For Clamping Timber
Quality Domed Head Bolt
Perfect For External Applications
#TOP 2

TIMCO BZP Carriage Bolt and Hex Nut

10150CBP
Silver
M10 x 150mm
TIMCO BZP Carriage Bolt and Hex Nut Cover
TIMCO BZP Carriage Bolt and Hex Nut - M10 x 150 - Zinc - Pack of 2

Features
Zinc Plated Ideal For Clean, Dry And Low Humidity Environments
Complete With m10 Hex Nuts
Used For Clamping Timber Or Attaching Ironmongery To Timber
Square Anti Spin Shoulder
#TOP 3

Carriage Bolt & Nut ZP M8 x 150mm Bag 10

FORCB8150G
Silver
M8 x 150
Carriage Bolt & Nut ZP M8 x 150mm Bag 10 Cover
Carriage Bolt & Nut ZP M8 x 150mm Bag 10

Features
Corrosion Resistant
Zinc Plated
Ideal For Timber To Timber Fastening
Fully Threaded To 100mm
Complete With Hex Nut
#TOP 4

TIMCO BZP Carriage Bolt with Hex Nut

12300CB
12x300
TIMCO BZP Carriage Bolt with Hex Nut Cover
TIMCO BZP Carriage Bolt with Hex Nut - M12 x 300 - Zinc - Box of 10

Features
Square Underhead To Assist With Grip When Tightening
Dome Head Carriage Bolt With Hex Nut
Zinc Plated
#TOP 5

M6 M8 M10 M12 Cup Square Carriage Bolts Coach Screw WITH Hex Full Nut 20-260mm

CB00
M6x35
M6 M8 M10 M12 Cup Square Carriage Bolts Coach Screw WITH Hex Full Nut 20-260mm Cover
M6 M8 M10 M12 Cup Square Carriage Bolts Coach Screw WITH Hex Full Nut 20-260mm (Pack of 5,10, 20, 50,100) (5, M6x35)

Features
Head Type: Dome
Manufactured From Grade 4.8 Carbon Steel
Please Note Images Of Products Are For Representation Purposes Only. Whilst Every Care Is Taken To Provide Accurate Images Of Products, Actual Products May Differ Slightly.
Material: Carbon Steel
Finish: Zinc
#TOP 6

M8 A2 Stainless Cup Square Carriage Bolt Dome Head DIN 603 by MultiScrew

A2CUPSQM8
Silver
M8 x 20mm
M8 A2 Stainless Cup Square Carriage Bolt Dome Head DIN 603 by MultiScrew Cover
M8 (8mm) A2 Stainless Cup Square Carriage Bolt Dome Head (Fully Threaded) DIN 603 by MultiScrew - Corrosion Resistant (20, M8 x 20mm)

Features
Carriage Bolts Are Characterized By A Flat Mushroom Or Dome Head, With A Square Section Under The Head To Ensure The Bolt Does Not Rotate Once Fitted Correctly. Carriage Bolts Are Used Primarily In Wood Constructions But Not To Be Confused With Coach Screws, Carriage Bolts Are Secured By The Use Of A Nut And Do Not Cut Thread When Tightening Into Position.
M8 (8mm) X 20mm Carriage Coach Bolt Cup Square A2 Stainless Steel Dome Head DIN 603
The Bolt Is Locked Into Placed By The Square Neck As The Nut Is Fastened Onto The Stationary Bolt. Cup Square Bolts Are Widely Used In Construction, Engineering, Fencing And Woodworking Environments. As With Hexagon Headed Bolts, When Measuring The Length Of A Cup Square Bolt It Is Important To Measure From The Underside Of The Head And Not To Include The Bolt Head To The End Of Threaded Portion.
Stainless Steel Coach Bolts Are A Higher Tensile Strength Than Normal Mild Steel Coach Bolts, And So Are Not Recommended For Use In Normal Structural Timber Applications Where Joint Movement Needs To Be Accommodated. Stainless Coach Bolts And Carriage Bolts Are Ideal For Exterior Applications, Or Applications Where The Bolt Will Be Exposed To Excess Moisture.
Sizes: M8 X 25mm, 30mm, 35mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 140mm, 150mm
Cup Square Bolts Are Also Commonly Referred To As Carriage Bolts Or Coach Bolts Due To Their Original Usage In The Manufacture Of Rolling Stock. Cup Square Bolts Consist Of A Domed Circular Head With A Square Neck Portion And Then A Round Shank. The Shank Consists Of Both A Plain Load Bearing Portion As Well As A Threaded Portion. Cup Square Bolts Are Usually Used In Conjunction With A Hexagon Threaded Nut (cup Sq Hex) Which Fastens Onto The Thread Of The Cup Square Bolt.

M5 Cup Square Carriage Bolt

M5x100 - A2 (10)
M5 Cup Square Carriage Bolt Cover
M5 (5mm x 100mm) Cup Square Carriage Bolt (Fully Threaded) - Stainless Steel (A2) (Pack of 10)

Features
Material: Stainless Steel
Head Type: Mushroom / Dome
Tolerance: ISO 965 Standard
Neck: Square (Locking)
Measurement: Metric
#TOP 8

ForgeFix Carriage Bolts | M10 x 240mm

CB10240M
Silver
M10 x 240mm
ForgeFix Carriage Bolts | M10 x 240mm Cover
ForgeFix Carriage Bolts | M10 x 240mm | Zinc Plated | Bag 10

Features
Ideally Suited For Timber To Timber Joining
A Round Head And A Square Neck That Prevents The Bolt From Turning While The Nut Is Tightened.
Zinc Plated To Increase Resistance To Corrosion
Hex Nut Included
#TOP 9

Merriway Carriage Bolts with Nuts Pack

BH02192
Zinc Plated
M6 x 150 mm
Merriway Carriage Bolts with Nuts Pack Cover
Merriway BH02192 (6 Pcs) Carriage Bolts with Nuts, M6 x 150mm (1/4 inch x 6 inch) Zinc Plated - Pack of 6 Pieces

The Merriway Carriage Bolts are a reliable choice for various fastening needs. This pack includes six M6 x 150mm bolts with nuts, ensuring you have enough for your projects. The round head design provides a sleek finish, while the square neck prevents the bolts from turning during installation, making your work easier. Following the included instructions for fixing is essential to ensure a secure assembly, giving you peace of mind in your repairs or constructions.

What We Like
Includes 6 bolts and nuts
Round head for sleek finish
Square neck prevents turning
Easy installation with instructions

M8 Cup Square Carriage Bolt & Nut

HU-XI-113
Silver
M8x60 - St(10)
M8 Cup Square Carriage Bolt & Nut Cover
M8 (8mm x 60mm) Cup Square Carriage Bolt & Nut - Steel (Pack of 10)

Features
Material: Steel
Head Type: Mushroom / Dome
Tolerance: ISO 965 Standard
Plating: Corrosion-Retardent Zinc
Measurement: Metric
Buying Guide Image
Editor's Notes

During our domed carriage bolt research, we found 142 domed carriage bolt products and shortlisted 10 quality products. We collected and analyzed 13,861 customer reviews through our big data system to write the domed carriage bolts list. We found that most customers choose domed carriage bolts with an average price of £5.07.

The domed carriage bolts are available for purchase. We have researched hundreds of brands and picked the top brands of domed carriage bolts, including TIMCO, Forgefix, Cheapscrews, MultiScrew, Singularity Supplies.

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.