Best Metric Carriage Bolts of 2025

Corey Phillips Avatar
Corey Phillips
Last Updated: 1 Feb 2025

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Metric carriage bolts are an essential component for fastening and securing various structures and equipment. These bolts are designed to have a rounded head with a square shoulder, which provides a clean and finished look to the fastened surface. The metric sizing system ensures a precise fit, making it easy to find a bolt that matches the required diameter and length. Metric carriage bolts are commonly used in construction, automotive, and machinery applications, providing a strong and stable connection that can withstand heavy loads and vibrations.

At a Glance: Our Top Picks

Hillman M10 x 40 Carriage Bolt 6-Pack Cover #TOP 1
Hillman M10 x 40 Carriage Bolt 6-Pack
ftb score rating icon 9.9
Hillman Metric Carriage Bolt M10 x 20, 10-Pack Cover #TOP 2
Hillman Metric Carriage Bolt M10 x 20, 10-Pack
ftb score rating icon 9.8
M5 Stainless Steel Cup Square Carriage Bolts Cover #TOP 3
M5 Stainless Steel Cup Square Carriage Bolts
ftb score rating icon 9.6

Top 10 Metric Carriage Bolts

#TOP 1

Hillman M10 x 40 Carriage Bolt 6-Pack

Hillman
45916
Hillman M10 x 40 Carriage Bolt 6-Pack Cover
Hillman 45916 Metric Carriage Bolt (M10 x 40 | 1.50 Pitch) Steel, Zinc-Plated, Silver, 6-Pack

The Hillman Carriage Bolt is a reliable choice for fastening wooden surfaces to wood or metal. Its flat, smooth head means you won't need a washer, simplifying your project. With the square underside of the head being self-locking, you won’t require a driving tool, making installation quicker and easier. Additionally, the M10 x 1.50mm coarse thread type ensures a secure fit, providing peace of mind that your construction will remain sturdy. This product is designed for convenience and efficiency in your DIY tasks.

What We Like
Easy installation without tools
Washer-free design
Secure self-locking feature
Versatile for wood and metal
#TOP 2

Hillman Metric Carriage Bolt M10 x 20, 10-Pack

Hillman
45912
Hillman Metric Carriage Bolt M10 x 20, 10-Pack Cover
Hillman 45912 Metric Carriage Bolt (M10 x 20 | 1.50 Pitch) Steel, Zinc-Plated, Silver, 10-Pack

The Hillman Carriage Bolt is designed to securely fasten wooden surfaces to wood or metal, making it an essential for your DIY projects. Its flat, smooth head means you won't need a washer, simplifying your assembly process. The square underside of the head is self-locking, allowing for easier installation without requiring a driving tool. Additionally, with an M10 x 1.50mm coarse thread, this bolt provides a robust grip, ensuring your fixtures remain securely in place.

What We Like
Self-locking design
No washer needed
Easy installation
Versatile for wood and metal
Robust grip

M5 Stainless Steel Cup Square Carriage Bolts

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

The Singularity Supplies Carriage Bolts are made from durable stainless steel, ensuring long-lasting performance. The mushroom dome head design provides a clean finish, making it ideal for visible applications. With a square neck, these bolts lock securely in place, preventing any loosening over time. Measuring at 5mm x 100mm, they adhere to the ISO 965 standard for tolerance, which guarantees reliable sizing and compatibility with your projects. These features offer you convenience and peace of mind, knowing your fixtures will remain secure and stable.

What We Like
Durable stainless steel construction
Mushroom dome head design
Square neck for secure locking
ISO 965 standard compliance
#TOP 4

TERF M8 X 120mm Carriage Bolts and Nuts Pack

TERF - CBN -005
TERF M8 X 120mm Carriage Bolts and Nuts Pack Cover
TERF® M8 X 120mm Cup Square Carriage Bolt and Nut M8 (8mm) X 120mm Coach Bolts with Hexagon Nuts - Pack of 10

The TERF Carriage Bolts Pack includes 10 pieces of M8 (8mm) X 120mm cup square carriage bolts and nuts, perfect for various construction and DIY projects. Made from zinc plated steel, these bolts offer durability and resistance to corrosion, ensuring a long-lasting solution for your fastening needs. The mushroom/dome head type provides a neat finish and helps prevent loosening, giving you peace of mind. Remember to check your required size and quantity before purchase for the best fit.

What We Like
Durable zinc plated steel
Mushroom head prevents loosening
Includes 10 pieces
Metric measurements for precision
#TOP 5

TERF M5 Cup Square Carriage Bolts Pack

TERF - CBN -001
TERF M5 Cup Square Carriage Bolts Pack Cover
TERF® M5 X 70mm Cup Square Carriage Bolt and Nut M5 (5mm) X 70mm Coach Bolts with Hexagon Nuts - Pack of 20

The TERF M5 Carriage Bolts are a reliable choice for your fastening needs. This pack includes 20 cup square carriage bolts and nuts, ensuring you have enough for your project. Made from zinc plated steel, they offer durability and rust resistance, which is essential for outdoor use. With a size of M5 (5mm) X 70mm, they fit a variety of applications. The mushroom head type provides a smooth finish and helps distribute weight evenly, enhancing stability in your constructions.

What We Like
Durable zinc plated steel
Includes 20 bolts and nuts
Rust resistant for outdoor use
Mushroom head for stability
Metric measurement for versatility
#TOP 6

M6 Cup Square Carriage Bolt Pack of 10

HXX-HX-173
M6x60 - A2 (10)
M6 Cup Square Carriage Bolt Pack of 10 Cover
M6 (6mm x 60mm) Cup Square Carriage Bolt (Fully Threaded) - Stainless Steel (A2) (Pack of 10)

The M6 Carriage Bolt Pack is an ideal choice for various fastening needs. Featuring a mushroom or dome head type, these bolts provide a secure grip and an aesthetically pleasing finish. Made from durable stainless steel, they offer excellent corrosion resistance, ensuring long-lasting performance in different environments. The square neck design allows for locking in place, giving you peace of mind that your constructions will remain stable. With measurements adhering to the ISO 965 standard, you can trust the accuracy and reliability of these bolts for your projects.

What We Like
Durable stainless steel material
Secure square locking neck
Aesthetically pleasing dome head
Accurate ISO standard measurements
#TOP 7

TERF M6 x 150mm Carriage Bolts and Nuts

TERF - CBN -003
TERF M6 x 150mm Carriage Bolts and Nuts Cover
TERF® M6 X 150mm Cup Square Carriage Bolt and Nut M6 (6mm) X 150mm Coach Bolts with Hexagon Nuts - Pack of 10

The TERF Carriage Bolts are a set of 10 bolts and nuts, designed for various applications. Made from zinc plated steel, these bolts ensure durability and resistance to rust, providing you with long-lasting reliability. Measuring M6 (6mm) x 150mm, they are versatile for different projects. The mushroom or dome head type allows for easy installation and a smooth finish, making them user-friendly. Before purchasing, ensure to check the required size and pack quantity to meet your needs.

What We Like
Durable zinc plated steel
Versatile size options
Easy to install
Rust resistance
#TOP 8

M8 Stainless Steel Cup Square Carriage Bolt

M8x45 - A2 (10)
M8 Stainless Steel Cup Square Carriage Bolt Cover
M8 (8mm x 45mm) Cup Square Carriage Bolt (Fully Threaded) - Stainless Steel (A2) (Pack of 10)

The M8 Carriage Bolt is made from durable stainless steel, ensuring longevity and resistance to rust, making it ideal for outdoor applications. Its mushroom dome head offers a stylish finish while providing a secure grip for your projects. The square neck design prevents the bolt from turning during installation, allowing for easier and more efficient fastening. With its metric measurements and adherence to ISO 965 standards, you can trust the M8 Carriage Bolt to meet your precise needs in various construction tasks.

What We Like
Durable stainless steel material
Mushroom head for secure grip
Square neck prevents turning
Metric measurements for precision
ISO 965 standard compliance
#TOP 9

M8 Cup Square Carriage Bolt and Nut Pack

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

The Singularity Supplies Carriage Bolt is designed with a mushroom dome head, making it easy to install while providing a secure grip. Made from durable steel, it ensures strength and longevity for your projects. The corrosion-retardant zinc plating protects against rust, extending the life of the fasteners. With metric measurements and compliance with ISO 965 standards, you can be assured of precision and quality, making your assembly tasks smoother and more reliable.

What We Like
Durable steel construction
Corrosion-resistant zinc plating
Mushroom head for easy installation
Metric measurements for precision
#TOP 10

YXQ 8Pcs M6x16mm Stainless Steel Carriage Bolts

YXQ
Silver
YXQ 8Pcs M6x16mm Stainless Steel Carriage Bolts Cover
YXQ 8Pcs M6x16mm Carriage Bolts Square Neck Metric DIN603 Fully Thread 304 Stainless Steel

The YXQ Carriage Bolts are crafted from high-quality 304 stainless steel, ensuring durability and resistance to rust. With a round head and fully threaded design, these bolts provide excellent grip and stability for your projects. Measuring 16mm in length, they are perfect for various fastening needs, offering a secure hold. The standard DIN603 ensures compatibility with many applications, making them a reliable choice for both professionals and DIY enthusiasts.

What We Like
Durable stainless steel material
Fully threaded for strong grip
Standard DIN603 compatibility
Ideal for various applications
Pack includes 10 bolts
Buying Guide Image
Editor's Notes

During our metric carriage bolt research, we found 306 metric carriage bolt products and shortlisted 10 quality products. We collected and analyzed 9,855 customer reviews through our big data system to write the metric carriage bolts list. We found that most customers choose metric carriage bolts with an average price of £5.55.

The metric carriage bolts are available for purchase. We have researched hundreds of brands and picked the top brands of metric carriage bolts, including Hillman, Singularity Supplies, TERF, YXQ. The seller of top 1 product has received honest feedback from 101 consumers with an average rating of 4.7.

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.