11 best carriage bolts

Carriage bolts, also known as coach bolts, are a type of fastener commonly used in construction, woodworking, and other applications where a sturdy and secure connection is required. These bolts have a distinctive design that sets them apart from standard bolts. Here's what you need to know about carriage bolts:

Design: Carriage bolts have a smooth, rounded, dome-shaped head with a square or rectangular neck just below the head. This neck is often ribbed or serrated to prevent the bolt from rotating when it's tightened into place. The rest of the bolt has a cylindrical shank.
Material: Carriage bolts are typically made from steel, although they can also be found in other materials such as stainless steel, brass, or aluminum, depending on the application and environmental factors.
Threaded End: The opposite end of the bolt from the head is threaded. The threads can be either coarse or fine, depending on the specific requirements of the project.
Fastening: Carriage bolts are installed by inserting the threaded end through a pre-drilled hole in the material to be joined. The square or rectangular neck under the head fits into a corresponding square or rectangular hole in the material, preventing the bolt from turning as the nut is tightened onto the threads. This design ensures a secure and stable connection.
Applications: Carriage bolts are commonly used in construction, woodworking, and outdoor projects. They are often employed in situations where the appearance of the fastener matters because the smooth, rounded head of the carriage bolt sits flush with the material surface, providing a clean and finished look.
Strength and Durability: Carriage bolts are known for their strength and durability, making them suitable for applications where a reliable and long-lasting connection is essential. They are often used in structural applications, such as attaching wooden beams or securing machinery.
Sizes: Carriage bolts come in various sizes, with different lengths and diameters, to accommodate different project requirements. The square or rectangular neck size also varies accordingly.
Nuts and Washers: To secure a carriage bolt, a nut is typically threaded onto the exposed end of the bolt. Using a washer beneath the nut can help distribute the load and provide additional support.
Finishes: Carriage bolts can be found in various finishes, including plain, zinc-plated, or galvanized, depending on the intended application. These finishes help protect the bolt from corrosion and enhance its appearance.
Installation: When installing carriage bolts, it's essential to ensure that the square or rectangular neck fits snugly into the corresponding hole.This prevents the bolt from spinning as it's tightened, which can compromise the connection's integrity.

Carriage bolts are versatile fasteners used in a wide range of projects where both strength and aesthetics are important. Their unique design and secure fastening method make them a popular choice in construction and woodworking applications.

Below you can find our editor's choice of the best carriage bolts on the market

SNUG Fasteners (SNG328) Ten (10) 3/8-16 x 3 Long Carriage Bolts Set w/Nuts & Washers

SNUG Fasteners

Based on 116 reviews Check latest price

Product description

Round domed head with square neck. Package includes ten each of bolts, hex nuts & washers. Zinc plated for corrosion resistance. Suitable for indoor or outdoor use. SNUG Fasteners are always backed by a 100% satisfaction guarantee.

Round domed head with square neck
Package includes ten each of bolts, hex nuts & washers
Zinc plated for corrosion resistance
Suitable for indoor or outdoor use
SNUG Fasteners are always backed by a 100% satisfaction guarantee

Prime-Line 9063761 Carriage Bolts, 3/8 in.-16 X 3-1/2 in., A307 Grade A Zinc Plated Steel, 25-Pack

PRIME-LINE

Based on 13 reviews Check latest price

Product description

Carriage bolts feature a slightly rounded head and have no exposed sharp edges when fully fastened. Due to that reason, they are often used when a more aesthetic look is desired. They are commonly used on docks and on playground equipment or in cases where it may be difficult to reach the bolt head with a tool. The square shoulder on carriage bolts help to hold it in place while the nut is fastened.

Size: 3/8 inch-16 X 3-1/2 inch
Features a smooth rounded head as opposed to a standard hex head
Square shoulder allows for nut to be tightened or loosened
Often used in cases where a protruding bolt head could cause injury
Nuts and washers not included, ensure washers and nuts are same diameter

User questions & answers

Question:	How many are in a pack
Answer:	Yes, the new filters will be exactly like the one that came with the humidifier.

Hillman 812626 1/2X6 Carriage Bolt, 1/2 x 6-Inch, Galvanized, 25

Hillman

Based on 51 reviews Check latest price

Product description

Carriage Bolts are designed to fasten a wooden face to either a wood or metal frame. Its flat head is designed to eliminate the need for a washer and provide a semi-flush finish to applications. The square underside of the head is self locking to eliminate spinning and the need for a driving tool. The galvanized finish provides optimal rust prevention but can be chalky in appearance.

From the Manufacturer

Carriage Bolts have a smooth, rounded head that has a small square section underneath. They are used in wood connections utilizing the square neck under the round head which will sit into the hole to prevent the head from turning. These carriage bolts come plated in zinc for moderate corrosion resistance.

Carriage Bolts are designed to fasten a wooden face to either wood or metal
Flat head provides a semi-flush finish to applications
The heads is designed to eliminate the need for a washer
Square underside of the head is self locking to eliminate the need for a driving tool
Galvanized finish is perfect for rust prevention

User questions & answers

Question:	Do these come with the nut
Answer:	No
Question:	How many in package
Answer:	I apologize. I don't know.

SNUG Fasteners (SNG289) Ten (10) 1/4-20 x 5 Long Carriage Bolts Set w/Nuts & Washers

SNUG Fasteners

Based on 29 reviews Check latest price

Product description

Round domed head with square neck
Package includes ten each of bolts, hex nuts & washers
Zinc plated for corrosion resistance
Suitable for indoor or outdoor use
SNUG Fasteners are always backed by a 100% satisfaction

SNUG Fasteners (SNG327) Ten (10) 3/8-16 x 2 Long Carriage Bolts Set w/Nuts & Washers

SNUG Fasteners

Based on 18 reviews Check latest price

Product description

Round domed head with square neck
Package includes ten each of bolts, hex nuts & washers
Zinc plated for corrosion resistance
Suitable for indoor or outdoor use
SNUG Fasteners are always backed by a 100% satisfaction

SNUG Fasteners (SNG284) 100 Qty 1/4-20 x 2 Long Carriage Bolts Set w/Nuts & Washers

Based on 22 reviews Check latest price

Product description

Round domed head with square neck. Package includes 100 each of bolts, hex nuts & washers. Zinc plated for corrosion resistance. Suitable for indoor or outdoor use. SNUG Fasteners are always backed by a 100% satisfaction .

Round domed head with square neck
Package includes 100 each of bolts, hex nuts & washers
Zinc plated for corrosion resistance
Suitable for indoor or outdoor use
SNUG Fasteners are always backed by a 100% satisfaction

SNUG Fasteners (SNG331) Ten (10) 3/8-16 x 6 Long Carriage Bolts Set w/Nuts & Washers

SNUG Fasteners

Based on 25 reviews Check latest price

Product description

Round domed head with square neck
Package includes ten each of bolts, hex nuts & washers
Zinc plated for corrosion resistance
Suitable for indoor or outdoor use
SNUG Fasteners are always backed by a 100% satisfaction

Hard-to-Find Fastener 014973230487 Carriage Bolts, 1/4-20 x 2-Inch, 100-Piece

Hard-to-Find Fastener

Based on 34 reviews Check latest price

Product description

Midwest Carriage Bolt, 1/4-20 Thread, 2 in Overall Length, NC Thread, Zinc Plated. We stock a wide variety of fasteners ideal for many applications around the home, farm, business, automotive, and in industry. Most of our fasteners have a light zinc plating over steel giving a more rust resistant finish. We also sell coated and stainless products for additional rust resistance. We stock many grades of fasteners ranging from low carbon steel on up to hardened, heat treated steel. Not all fasteners are applicable for all applications so be certain to test thoroughly and get the opinion of a licensed building or certified building or structural engineer before relying on these fasteners for any situations where failure would result in damage to property or person.

ONESTOCK 3/8" x 12" Fully Threaded Carriage Bolts with Nuts & Washers, 12 Per Pack

onestock

Based on 50 reviews Check latest price

Product description

Carriage bolts are essential for repairing, building, and fastening existing structures. When you need to secure property quickly, you need carriage bolts. Used with durable plywood, carriage bolts are a fast, easy way to board-up windows after weather damage, vandalism or a robbery. They’re also great for putting up plywood to protect windows before a storm hits. If you’re short on time and need to do something fast, carriage bolts are a smart choice.

Our carriage bolts are available in three different sizes and they come with flat washers and nuts. We have these carriage bolts available in a package of 12.

Secure Property from Damage or Vandalism – Carriage bolts are a fast, easy way to board-up missing or broken windows
Protect Property Before a Storm – Use carriage bolts with plywood before a storm hits, to prevent window damage or vandalism
Premium Carriage Bolts – Zinc-plated steel carriage bolts are threaded for at least 3/4 of the length of the bolt
Bolt Ready to Use – Each carriage bolt includes a flat washer and nut
16 TPI (Threads Per Inch). Sold as a package of 12 carriage bolts & includes Bolts and nuts
3/8" Lag Bolts Grade 5 Threaded 12" Surface Bolts

User questions & answers

Question:	What size drill bit do I need for the 3/8 bolt
Answer:	No...... nuts and washers each sold separately.
Question:	Are they hot dipped galvanized
Answer:	25 each
Question:	Are the 12" bolts threaded the entire length of the bolt
Answer:	There are twenty five pieces in one package.
Question:	Are the bolts exactly 12" long total or is it 12" plus the head
Answer:	You should buy a cleaner for it that you put in it every single time you fill it. Most waters are hard on the system and it needs that on a regular basis in order to work properly.

SNUG Fasteners Ten (10) 1/4-20 x 2 Long Carriage Bolts Set w/Nuts & Washers (SNG283)

SNUG Fasteners

Based on 48 reviews Check latest price

Product description

Round domed head with square neck. Package includes ten each of bolts, hex nuts & washers. Zinc plated for corrosion resistance. Suitable for indoor or outdoor use. Snug Fasteners are always backed by a 100% satisfaction .

Round domed head with square neck
Package includes ten each of bolts, hex nuts & washers
Zinc plated for corrosion resistance
Suitable for indoor or outdoor use
Snug Fasteners are always backed by a 100% satisfaction

User questions & answers

Question:	Do you like this item
Answer:	Yes. They are threaded the entire length
Question:	How long are these, 2 inches
Answer:	They thread part is 12" long. The heads are an additional 1/4" or so