When it comes to securing two materials together with ease and reliability, carriage bolts are a go-to choice for many DIY enthusiasts and professionals alike. These specialized bolts feature a smooth, rounded head and a square shoulder beneath it, designed to prevent rotation and enhance stability. To save you time and effort in searching, we have compiled a list of the five best carriage bolt products available on Amazon. In this article, we will discuss their applications, instructions on how to use them, as well as the pros and cons of each option.

Best Carriage Bolt Choices: Our Top Selections

Makers Bolt Industrial Grade Carriage Bolts

Makers Bolt Industrial Grade Carriage Bolts are crafted from durable, corrosion-resistant steel, making them suitable for both indoor and outdoor applications. Their versatility makes them ideal for various projects, such as construction, woodworking, and furniture assembly. These bolts are available in various sizes and come with matching nuts and washers. They are relatively easy to install and require a pre-drilled hole, with the square shoulder fitting snugly into the wood or other materials.

Pros:

• Durable and corrosion-resistant steel construction.
• Versatile applications in construction, woodworking, and furniture assembly.
• Available in various sizes.
• Comes with matching nuts and washers.

Cons:

• Requires pre-drilled holes.

Hillman Zinc-Plated Carriage Bolts

Hillman Zinc-Plated Carriage Bolts are an excellent option for projects that require a strong and reliable connection. The zinc-plated finish provides enhanced corrosion resistance, making them suitable for both indoor and outdoor use. These bolts are commonly used in automotive, construction, and machinery applications. They are available in different lengths and diameters to accommodate various project requirements.

Pros:

• Strong and reliable connection.
• Zinc-plated finish for improved corrosion resistance.
• Versatile applications in automotive, construction, and machinery projects.
• Available in different lengths and diameters.

Cons:

• May not be suitable for highly corrosive environments.

YEEZET Stainless Steel Carriage Bolts

For projects that demand exceptional corrosion resistance, YEEZET Stainless Steel Carriage Bolts are an excellent choice. Made from high-quality stainless steel, these bolts are highly resistant to rust, making them ideal for marine, outdoor, and humid environments. Their polished finish adds an aesthetic appeal, making them suitable for applications that require both functionality and visual appeal.

Pros:

• Excellent corrosion resistance, suitable for marine and outdoor environments.
• Polished finish for an attractive appearance.
• High-quality stainless steel construction.

Cons:

• May be more expensive compared to other options.

The Hillman Group Black Oxide Carriage Bolt Pack

If you are looking for carriage bolts that offer a unique aesthetic while maintaining strength and durability, the Hillman Group Black Oxide Carriage Bolts are worth considering. The black oxide coating not only provides an appealing finish but also adds an extra layer of corrosion resistance. These bolts are commonly used in decorative applications, such as furniture, where visual appeal is essential.

Pros:

• Unique black oxide coating for an attractive appearance.
• Provides enhanced corrosion resistance.
• Suitable for decorative applications.

Cons:

• Limited color choice may not suit all projects.

MewuDecor Grade 8 Carriage Bolts

When it comes to heavy-duty applications requiring superior strength, MewuDecor Grade 8 Carriage Bolts are an excellent option. These bolts are made from hardened steel and are designed to withstand extreme forces and stress. They are commonly used in automotive, machinery, and structural applications where maximum strength and reliability are paramount.

Pros:

• Exceptional strength and durability.
• Suitable for heavy-duty applications.
• Ideal for automotive, machinery, and structural projects.

Cons:

• May be overkill for lightweight projects.

Conclusion

Carriage bolts offer a reliable and secure fastening solution for a wide range of applications. The five options discussed in this article — XYZ Industrial Grade Carriage Bolts, ABC Zinc-Plated Carriage Bolts, PQR Stainless Steel Carriage Bolts, MNO Black Oxide Carriage Bolts, and RST Grade 8 Carriage Bolts — offer various features and advantages to cater to different project requirements. Whether you’re working on woodworking, construction, machinery, or decorative projects, there’s a carriage bolt available on Amazon that will meet your needs. Consider the pros and cons outlined for each option to make an informed decision and achieve optimal results in your projects.

Factors to Consider When Choosing a Carriage Bolt

When selecting a carriage bolt, there are several factors to consider to ensure you choose the right one for your specific needs. Here are some key aspects to look for:

1. Material: Carriage bolts are commonly made from steel, stainless steel, or brass. The material choice should depend on the application and environmental conditions. Steel carriage bolts are durable and suitable for most projects. Stainless steel bolts offer excellent corrosion resistance, making them ideal for outdoor or marine applications. Brass bolts are mainly used in decorative applications due to their attractive appearance.
2. Size and Dimensions: Consider the length, diameter, and thread size of the carriage bolt. The length should be sufficient to pass through the material being fastened, with enough length remaining to secure the nut. The diameter and thread size should match the requirements of your project, ensuring a proper fit.
3. Finish and Coating: Carriage bolts may come with various finishes and coatings to enhance their appearance and provide additional protection against corrosion. Common finishes include zinc-plating, black oxide coating, or polished stainless steel. Choose a finish that suits your project’s aesthetic requirements and provides adequate corrosion resistance for the intended environment.
4. Strength Grade: Carriage bolts are often labeled with strength grades such as Grade 2, Grade 5, or Grade 8. Higher-grade bolts offer increased strength and are suitable for heavy-duty applications where maximum load-bearing capacity is required. Consider the strength grade based on the level of stress and load the bolt will experience in your project.
5. Thread Type: Carriage bolts typically have a coarse thread, which provides better gripping power and is suitable for most applications. However, in some cases, you may need a fine-threaded carriage bolt, especially for specific projects or materials.
6. Application Compatibility: Consider the specific application for which you need the carriage bolt. Different projects may require different types of carriage bolts, such as those designed for woodworking, construction, machinery, or decorative purposes. Ensure the bolt you choose is suitable for the intended application and can handle the anticipated load and stress.
7. Package Contents: Check if the carriage bolt comes with accompanying nuts and washers. Having matching nuts and washers included can save you time and effort in sourcing them separately.

By considering these factors, you can choose a carriage bolt that meets your project’s requirements in terms of strength, durability, corrosion resistance, and compatibility. Always refer to the manufacturer’s specifications and guidelines for further guidance on selecting the appropriate carriage bolt for your specific application.

Exploring the Uses of a Carriage Bolt: From Construction to Furniture

Construction and Structural Projects:

• Carriage bolts find extensive use in construction and structural projects. They are commonly employed to secure wooden beams, posts, and joists together. Carriage bolts are ideal for applications where a strong, stable connection is crucial, such as framing structures, decks, and fences. They are often utilized in combination with washers and nuts to provide enhanced load-bearing capacity and structural integrity.

Woodworking and Furniture Assembly:

• In the realm of woodworking, carriage bolts play a vital role in joining wooden pieces, ensuring structural stability and longevity. From building cabinets and tables to constructing bed frames and bookshelves, carriage bolts offer a secure connection that can withstand the stress and weight exerted on the furniture. Their smooth, rounded heads also provide an aesthetic advantage, allowing for a clean and polished appearance.

Automotive and Machinery:

• Carriage bolts find their way into automotive and machinery applications as well. In vehicle manufacturing and repair, they are used to secure various components such as engine mounts, brackets, and suspension parts. Their robust construction and resistance to vibration make them an excellent choice for withstanding the rigors of automotive environments. Similarly, in machinery assembly and maintenance, carriage bolts provide a reliable connection, ensuring the smooth operation of equipment.

Outdoor and Marine Environments:

• Due to their durability and resistance to corrosion, carriage bolts are widely used in outdoor and marine applications. These bolts are often made from stainless steel or have zinc-plated or galvanized coatings, offering protection against rust and the elements. Carriage bolts are employed in projects like building docks, installing outdoor structures, erecting fences, and securing marine equipment. Their ability to withstand moisture and exposure to saltwater makes them ideal for these demanding environments.

Decorative and Ornamental Projects:

• Beyond their functional applications, carriage bolts can also serve as decorative elements in various projects. The unique round head and the option of different finishes, such as black oxide or brass, make them suitable for adding aesthetic appeal to furniture, gates, doors, and other ornamental pieces. The bolts can be strategically placed to enhance the visual impact while maintaining structural integrity.

Step-by-Step Guide: How to Use a Carriage Bolt

Carriage bolts are versatile fasteners commonly used for secure and reliable connections in various applications. Follow this step-by-step guide to learn how to use a carriage bolt effectively:

Materials Needed:

• Carriage bolt
• Drill
• Drill bit
• Wrench
• Nuts and washers (if not included with the carriage bolt)
• Workpiece/material being fastened

Step 1: Prepare the Workpiece 

Ensure the workpiece or material you are fastening is clean and free from any debris or obstructions. Position the materials together in the desired configuration, ensuring they are aligned correctly.

Step 2: Mark the Hole Placement 

Using a pencil or marker, mark the location on the workpiece where you want to place the carriage bolt. Make sure the mark corresponds with the hole on the other material you are joining.

Step 3: Select the Drill Bit 

Choose a drill bit that matches the diameter of the carriage bolt’s shank. The drill bit should be slightly smaller than the bolt’s diameter to create a snug fit.

Step 4: Pre-drill the Hole 

Secure the workpiece firmly in place and carefully drill a hole through the marked spot using the selected drill bit. Ensure that the hole is perpendicular to the surface of the material. Use a consistent and controlled drilling motion to avoid any damage.

Step 5: Insert the Carriage Bolt 

Insert the carriage bolt through the hole you drilled, ensuring that the square shoulder beneath the head is fully seated into the material. The rounded head of the bolt should be on the side where you want the decorative or smooth surface.

Step 6: Secure the Bolt 

Place a washer onto the protruding end of the carriage bolt, followed by a nut. Tighten the nut onto the bolt by hand until it is snug.

Step 7: Fasten the Bolt 

Using a wrench or socket, firmly tighten the nut until it is securely fastened. Be cautious not to overtighten, as it may damage the materials or affect the stability of the connection. Ensure that the materials being joined are held firmly together without any wobbling or movement.

Step 8: Check the Connection 

Double-check the connection to ensure the materials are securely fastened and the carriage bolt is holding them together tightly. Verify that the joint is stable and does not exhibit any significant play or movement.

Step 9: Repeat the Process (If Required) 

If you are joining multiple pieces or need additional carriage bolts for your project, repeat Steps 2 to 8 for each bolt. Ensure proper spacing and alignment between the bolts to maintain structural integrity.

Conclusion: Using carriage bolts provides a reliable and secure connection for a variety of applications. By following this step-by-step guide, you can confidently use carriage bolts to join materials together, whether it’s for construction, woodworking, automotive, or other projects. Remember to select the appropriate bolt size, pre-drill the holes accurately, and tighten the nuts securely to achieve a strong and stable connection.

Frequently Asked Questions

What sizes do carriage bolts come in?

Carriage bolts are available in a range of sizes to accommodate different project requirements. The sizes of carriage bolts typically refer to their diameter, length, and thread size. Here are some common size specifications for carriage bolts:

Diameter: Carriage bolts are available in various diameters, typically ranging from 1/4 inch to 1 inch or more. The most commonly used diameters include 1/4″, 5/16″, 3/8″, 1/2″, and 5/8″.

Length: The length of a carriage bolt refers to the measurement from the underside of the head to the tip of the bolt. Lengths can vary significantly based on the application and specific project needs. Common lengths for carriage bolts can range from 1 inch to 12 inches or more, with popular sizes including 1″, 1-1/2″, 2″, 2-1/2″, 3″, and 4″.

Thread Size: Carriage bolts have a coarse thread, which provides better gripping power. The thread size is often specified as a thread pitch or threads per inch (TPI). Common thread pitches for carriage bolts are 13 TPI and 16 TPI.

It’s important to note that the availability of specific sizes may vary depending on the manufacturer, supplier, or region. When selecting carriage bolts for your project, ensure that the bolt diameter, length, and thread size match the requirements of your application. Additionally, consider factors such as the load-bearing capacity, material compatibility, and specific project needs to determine the appropriate size of the carriage bolt for optimal performance and safety.

How much weight can different carriage bolts support?

The weight-bearing capacity of carriage bolts can vary depending on several factors, including the diameter, length, material, and grade of the bolt, as well as the specific application and installation conditions. Here’s a general guideline on the weight-bearing capacity of carriage bolts based on their strength grade:

1. Grade 2 Carriage Bolts: Grade 2 carriage bolts are the most common and widely available. They have a lower tensile strength compared to higher-grade bolts and are suitable for lighter-duty applications. As a rough estimate, grade 2 carriage bolts can support loads ranging from a few hundred pounds to around 1,000 pounds, depending on their diameter, length, and installation conditions.
2. Grade 5 Carriage Bolts: Grade 5 carriage bolts offer higher tensile strength compared to grade 2 bolts. They are commonly used in applications that require medium to heavy-duty load-bearing capacity. Grade 5 carriage bolts can typically support loads ranging from a few thousand pounds to around 10,000 pounds, depending on their size and installation conditions.
3. Grade 8 Carriage Bolts: Grade 8 carriage bolts provide the highest tensile strength and are designed for heavy-duty applications. They offer exceptional load-bearing capacity and are commonly used in structural and automotive projects. Grade 8 carriage bolts can support loads ranging from several thousand pounds to well over 20,000 pounds, depending on their size, length, and installation conditions.

It’s important to note that the weight-bearing capacity of carriage bolts can also be influenced by other factors such as the material and condition of the materials being fastened, the quality of installation, and the specific load distribution in the application. For critical or specialized applications, consulting with a structural engineer or referring to load tables provided by bolt manufacturers is recommended to ensure the appropriate carriage bolt selection for the desired load-bearing requirements.

In any case, it’s always crucial to choose the right size, grade, and material of the carriage bolt, considering the specific demands of your project to ensure a safe and reliable connection.

What is the strongest material for a carriage bolt?

In general, carriage bolts are commonly made from steel due to its strength and durability. Steel carriage bolts are available in various grades, such as Grade 2, Grade 5, and Grade 8, each offering different levels of strength and hardness.

Among these grades, Grade 8 steel is typically considered the strongest option for carriage bolts. Grade 8 steel bolts are made from alloy steel and undergo a heat treatment process to achieve their high tensile strength. They are often used in applications where maximum strength and load-bearing capacity are required, such as in heavy machinery, automotive parts, and structural components.

It’s worth noting that there are other materials used for specialized applications, such as stainless steel carriage bolts for corrosion resistance or brass carriage bolts for their decorative appearance. However, in terms of sheer strength, Grade 8 steel is generally considered the strongest material for carriage bolts.

Does a carriage bolt hold better than screws?

The effectiveness of carriage bolts versus screws depends on the specific application and the requirements of the joint or connection you are trying to create. Both carriage bolts and screws have their own advantages and considerations.

Carriage Bolts:

1. Strength and Load-Bearing: Carriage bolts are typically stronger and offer higher load-bearing capacity compared to screws, especially when using high-grade steel carriage bolts.
2. Resistance to Withdrawal: Carriage bolts are less prone to being pulled out of the material compared to screws because of their design, which includes a square neck that prevents rotation when installed.
3. Structural Integrity: Carriage bolts are often used in applications where the joint requires added structural integrity, such as in heavy construction or machinery.

Screws:

1. Versatility: Screws come in various types and sizes, making them versatile for a wide range of applications. They can be used in different materials, including wood, metal, and plastic.
2. Ease of Installation: Screws can be easily installed using basic hand tools or power drivers, while carriage bolts may require additional tools like wrenches or sockets.
3. Disassembly and Reusability: Screws can be easily removed and reused, while carriage bolts may require cutting or damaging the material to disassemble them.
4. Concealed Installation: Screws can be countersunk or hidden beneath the surface, providing a more aesthetically pleasing finish.

In summary, if you need a strong, load-bearing connection where structural integrity is crucial, carriage bolts are often a better choice. However, screws offer versatility, ease of installation, and the ability to create concealed connections. The specific requirements of your project and the materials being used will help determine which option is best suited for your needs.