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Carriage bolts, or coach bolts are heavy-duty bolts with a square or hex head that are used to join metal and wood together. Primarily used in large construction projects, The beauty of using a carriage bolt is that is that the threads literally bit right through the wood creating a tight connection - that’s why a wrench or pliers are required to turn them. For added security use washers and threadlockers to keep bolts securely in place.


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A carriage bolt is a piece of hardware featuring a flat mushroom head, square neck and threading for wood fastening applications. Designed for heavy-duty loads, a carriage bolt is a go-to option any time you want to lock two structures together in a clamp-like fashion. Using a carriage bolt for your indoor and outdoor projects sets you up for long-term success, as these accessories are engineered to be permanent fastening solutions.

Builders with all levels of experience can use a carriage bolt as long as they have a hammer, drill and adjustable wrench available on-site. These devices can be removed if necessary, but keep in mind that mushroom head and square neck shapes leave behind an indentation in base materials. Carriage bolts are for installations in which you have clear access to both sides of a wooden surface.

Select a bit size that matches the diameter of your carriage bolt, drill a pilot hole in the wood and guide the threading through the opening. Consider using a hammer to drive the carriage bolt through the pilot hole if there is any resistance — you want the flat head and neck extension to sit flush against the wooden surface for grip and support.

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If you ever want to remove a carriage bolt, start by using a wrench or ratchet set to loosen the nut on the threading. Use your fingers to unscrew this piece all the way down to the bottom of the bolt, but do not take the nut off completely. Strike the nut with a hammer to bring the head and locking neck out of the base material.

Removing carriage bolts in this way prevents the threads from bending, which means you can reuse the hardware for another project. 


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These bolts are commonly used in the following areas for reliable fastening in schools, restaurants, hotels, hospitals and beyond: - Building outdoor lofts - Installing ramps for wheelchairs - Creating furniture (benches and tables) - Assembling swing sets and park equipment.


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Carriage bolts are a type of threaded that is specifically designed to be used with wood, though custom versions can be made to work with metal. Also called coach bolts or plow bolts, carriage bolts are quite common and can be found at most hardware stores in a number of lengths, diameters and thread pitches.

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A carriage bolt consists of a large round, domed head with an externally bolt projecting from it. The head usually does not have slots for a screwdriver or other driving force, and is typically at least twice the diameter of the bolt shaft. Beneath the head is a square fitting that grips the wood as the bolt is placed and fastened.

This is the basic carriage bolt design, but there is some variation. For example, one variation replaces the square fitting with ribbing that holds the bolt in place, for use with other metal components. Carriage bolts vary in length and diameter according to their intended uses, regardless of the type of materials that are being fastened by the bolts.

 
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They frequently secure pieces of timber together during the construction of outdoor decks, homes and pilings. They are also commonly used in machinery assembly, patio and ready-to-assemble furniture, chain link fences and even automobiles. Because the square fitting prevents the bolt from turning, carriage bolts are also a good choice for situations where the bolt head is not easily accessible.

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Consider that a bolt that is too narrow may lead to the fastener failing under strain, causing breakage, while a bolt that is too large may cause stress to the surrounding wood or metal, causing cracks. It is also important to consider length, as the carriage bolt must be long enough to go through the material it is fastening, but not so long that the protruding end becomes a nuisance.


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Hot dipped galvanized carriage bolts are very corrosion resistant and are commonly used in outdoor and marine environments. Galvanized bolts can only be used with galvanized nuts due to the thickness of the coating.
 
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Carriage bolts are a type of bolt specialised for use in woodworking, in particular, fastening metal to wood. Carriage bolts are designed with a domed head, which can prevent loosening from one side, an enlarged head shape also prevents the bolt from being pulled through a wooden construction. The presence of a domed head does mean that carriage bolts cannot be installed by methods which push the bolt axially during installation, such as a spanner drill adaptor.The square head section of a carriage bolt allows it to be installed using a spanner, for improved leverage.


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An unthreaded section below a carriage bolt’s square section adds strength and resistance to shear forces.Carriage bolts also provide several secondary benefits, such as the aesthetic appeal of their rounded head, which can give a finished appearance to many applications. Despite being intended for use with wood, carriage bolts have a machine screw thread, and are equally suitable for metal applications.


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Coach bolts are commonly used in fastening wood to metal and wood to wood. The unthreaded section of a coach bolt adds strength to its construction, and makes it more resistant to shear forces when compared to fully thread variants such as self tapping hexagon bolts.While specialised drives such as the pozi drive are specially designed to resist cam-out, the sturdy hexagon head of a coach bolt is even more resistant to slippage, and is typically more suitable for heavy-duty applications.

These bolts are made for heavy-duty applications and their compatibility with larger tooling, coach bolts are generally available in larger sizes than other self tapping screws.While coach bolts and carriage bolts are distinct screw types, they do share similarities in their general head shape, and the fact that they are suitable for use with wood.


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Certain wood types are also acidic, and may contain corrosive natural chemicals. In these applications, stainless steel coach screws and carriage bolts are an ideal alternative..

A carriage bolt, coach bolt or round head square neck bolt is a form of bolt used to fasten metal to wood. It is distinguished from other bolts by its shallow mushroom head and that the shank cross-section of the bolt is circular for most of its length, as usual, but the portion immediately beneath the head is formed into a square section.

This allows the fastener to be installed with only a single tool, a spanner or wrench, working from one side. The head of a carriage bolt is usually a shallow dome. The squared section is of the same size as the diameter of the bolt shank, with a plain unthreaded shank.

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It is commonplace though to use them to bare timber, the squared section giving enough grip to prevent rotation. Carriage bolts are extensively used for security fixings, such as locks and hinges, where the bolt must only be removable from one side. The smooth domed head and square nut below prevent the carriage bolt from being unlocked from the insecure side.

They have a domed head that is proportionally wider than that of a carriage bolt, and instead of a square section of shank under the head, they have four sharp-cornered fillets that grip the edge of the hole in the wood to prevent rotation. They are also known as mushroom head bolts or dome head bolts.

Plough bolts are a flush-fitting carriage bolt, where the head is countersunk beneath the surface. They were first developed to hold replaceable ploughshares onto the mouldboard of iron ploughs. The share is the most quickly wearing part of the plough and would be replaced several times over the life of the plough.