Carriage bolts, also known as coach bolts, are commonly used in wood connections due to their unique design and functionality. These bolts feature a round head with a square neck that prevents the bolt from turning when installed in wood. This square neck seats into the hole in the wood, providing a secure connection. Carriage bolts are widely used in various applications, including furniture assembly, construction projects, and wooden structures.

Carriage Dimensions

The dimensions of carriage bolts vary depending on the specific requirements of the application. Carriage bolts are available in a range of sizes, with different head diameters, head heights, neck diameters, and neck lengths. Here are some common carriage dimensions:

Carriage Bolts
Carriage Bolts: Essential Fasteners for Wood Connections 2
Bolt Diameter D C H P F
Body Diameter Head Diameter Head Height Square Width Square Depth
Max Min Max Min Max Min Max Min Max Min
12 0.515 0.483 1.094 1.032 0.270 0.250 0.515 0.492 0.281 0.250
58 0.642 0.605 1.344 1.219 0.344 0.313 0.642 0.616 0.344 0.313
34 0.768 0.729 1.594 1.469 0.406 0.375 0.768 0.741 0.406 0.375
78 0.895 0.852 1.844 1.719 0.469 0.438 0.895 0.865 0.469 0.438
1 1.022 0.976 2.094 1.969 0.531 0.500 1.022 0.990 0.531 0.500
114* 1.277   2.850   0.531 0.500 1.250   0.625  
*Dimensions per ASME B18.5 1990 (R 1998) cover diameters up to 1″. Bolts over 1″ use custom head dimensions.

These dimensions are just examples, and carriage bolts are available in various sizes to suit different applications. The appropriate size of carriage bolt to use depends on factors such as the thickness of the materials being joined and the specific load requirements of the connection. For projects with unique requirements, it is recommended to consult with a reliable supplier or manufacturer.

Standard and Measurement Units

The dimensions provided in the Carriage Dimensions table adhere to industry standards for carriage bolts. The most commonly followed standards for carriage bolts include the ASTM (American Society for Testing and Materials) specifications. The specific ASTM specifications may vary depending on the material and grade of the carriage bolts.

It’s important to note that the dimensions listed in the table are in imperial units. The measurement units used for carriage bolts are typically expressed in inches (“). The diameter of the bolt and the corresponding measurements for the head diameter, head height, neck diameter, and neck length are all represented in inches.

When ordering carriage bolts or discussing specifications, it’s crucial to communicate the required size and dimensions in the appropriate measurement units (inches) to ensure accuracy and compatibility with your wood connection applications.

Please keep in mind that these measurement standards and units may vary based on the region and specific requirements of your project. It is always recommended to consult with a reliable supplier or manufacturer to confirm the applicable standards and measurement units for your specific needs.

Contact Us for Ordering

If you are in need of high-quality carriage bolts for your projects, we are here to help. As a trusted manufacturer and distributor of construction fasteners, we offer a wide range of carriage bolts in different sizes and materials. Our carriage bolts are made from durable materials such as carbon steel, alloy steel, and stainless steel, ensuring strength and corrosion resistance.

At Jmet Corp., we understand the importance of reliable and secure fastening solutions. Whether you require standard ASTM A307 specification or custom dimensions, our experienced team can assist you in finding the perfect carriage bolts to meet your specific needs.

To place an order or discuss your specific requirements, please contact our sales department at [insert contact information]. Our knowledgeable staff is available to provide guidance on selecting the right carriage bolts based on your application and desired performance characteristics. We pride ourselves on delivering high-quality products and excellent customer service, ensuring your satisfaction with every purchase.

Don’t compromise on the quality of your wood connections. By choosing our reliable carriage bolts, you can have peace of mind knowing that your fastening solutions are secure, durable, and built to last. Our commitment to superior craftsmanship and attention to detail sets us apart as a preferred supplier in the industry.

Remember to consult with our experts and secure your order today! Whether you are a contractor, builder, or do-it-yourself enthusiast, we are ready to fulfill your carriage bolt needs. Experience the difference of working with a trusted partner who values your satisfaction and the success of your projects.

We hope this information has been helpful. If you have any further questions, feel free to reach out to us.