
Finishing nails with a hammer can be a tricky task, and it's important to select the right tools for the job. Before you begin, ensure you have the correct nail length and type for your project. When installing trim, it is recommended to use a smooth-faced hammer to avoid denting the wood. You should also avoid driving the nail head flush with the surface, instead leaving a small gap and using a nail set to sink the head below the surface. Predrilling holes can also help to protect the wood from splits. When hammering, always wear safety glasses and be cautious of your hands and fingers.
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What You'll Learn

Use a smooth-faced hammer to avoid damaging the wood
When using a hammer and nails to finish wood trim, it is important to use the right tools and techniques to avoid damaging the wood. One way to do this is to use a smooth-faced hammer.
A hammer with a smooth face is designed for finish work and general-purpose fastening. It will help you avoid denting or marring the wood surface. A curved claw hammer is a good choice for its versatility, and a smaller 13-ounce hammer is easier to control. When hammering in tight spaces, use a smaller hammer with a U-shaped head.
To further prevent damage to the wood, you can use a nail set to get the nail flush with the wood surface. This is a common technique, even before nail guns were widely available. You can also use a punch to drive the nail deeper into the wood, so you don't have to hit the wood with the hammer. Then, use wood filler to fill in the nail hole and sand it down for a smooth finish.
Additionally, you can use a barrier to protect the wood from hammer strikes. Take a paint stirrer or a piece of wood and cut a notch in it to fit around the nail. This barrier will absorb the blows from the hammer and help you work faster without worrying about marring the wood.
Another method to avoid splitting the wood is to drill a pilot hole in the wood, using a slightly smaller diameter than the nails you are using. This will make it easier to drive the nails in and protect the wood from splits. However, drilling pilot holes will reduce the holding power of the nails, so it is only recommended for work that doesn't require maximum holding power, such as installing trim moldings.
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Predrill holes to prevent wood splitting
Predrilling holes is a useful step to prevent wood splitting when nailing or screwing two pieces of wood together. This is especially important when working with hardwood, as it does not compress like softwood and is more prone to splitting.
When predrilling holes, it is essential to use a drill bit that matches the diameter of the nail or screw shaft. For nails, the drilled hole should be slightly smaller than the nail diameter, approximately 75% to 80% of the size. This ensures a tight fit and prevents the nail from becoming loose. For screws, the hole should be the same diameter or slightly smaller than the screw shaft, excluding the threads. This allows the threads to cut into the sides of the hole securely. Before drilling, clamp the wood pieces together and ensure the drill bit is sharp. Regularly pull out the bit to clear wood shavings and prevent friction and smoking.
The type of nail used also affects the likelihood of wood splitting. Nails with blunt tips are less likely to split wood than sharp nails, as they crush wood fibres instead of parting them. Oval nails can also be preferable to round nails, provided the long axis is oriented correctly along the wood grain. If using sharp nails, blunting the tips with a hammer or snipping them with pliers can help reduce the risk of splitting. However, this may also reduce the gripping power of the nails, so predrilling is a more reliable method to prevent splitting while maintaining nail strength.
Predrilling is a useful technique for projects where there is a risk of nail blowouts or wood splitting. It allows the nails to go in more easily and protects the wood from splits. When using a hammer, predrilling can also help avoid dents and damage to the wood caused by missed strikes. While predrilling is not necessary for all nailing projects, it is a valuable step to consider when working with hardwood or when there is a risk of splitting.
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Use a nail set to get the nail flush with the wood
When using a hammer to finish nails, it is common to use a nail set to get the nail flush with the wood. A nail set is a tool with two ends: one end is used to drive the nail deeper into the wood, and the other end is used to countersink the nail, making it flush with the wood. The benefit of using a nail set is that you can drive the nail into the wood without hitting the wood with the hammer, reducing the risk of denting the wood.
To use a nail set effectively, follow these steps:
- Choose the correct size nail set for the finish nail you are using. It is important to have a nail set that is the right size, as using a nail set that is too large or too small can make it difficult to drive the nail flush with the wood.
- Use the punching end of the nail set to drive the nail deeper into the wood. Place the punching end of the nail set on the head of the nail and gently tap it with a hammer to drive the nail into the wood.
- Once the nail is driven in, use the countersinking end of the nail set to make the nail flush with the wood. Place the countersinking end of the nail set on the head of the nail and gently tap it with a hammer to sink the nail below the surface of the wood.
- If necessary, use wood filler to fill in the nail hole and sand the area smooth. This will create a seamless finish and hide any imperfections.
It is important to note that using a hammer and nail set to finish nails can be tricky, and there is a risk of missing the nail and denting the wood. An alternative method is to use a nail gun, which is easier and reduces the risk of damaging the wood. However, nail guns can also have their own set of issues, such as nail blowouts, which can split the wood.
Additionally, when dealing with flat-head nails, countersinking may not be possible. In this case, grinding the heads flush and then repainting may be a better option. A Dremel tool with a cutoff wheel can be useful for this purpose.
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Choose the right type of nail for your project
When selecting nails for your project, it's important to consider the specific requirements and scope of your task. Nails are available in various sizes, materials, and shaft configurations, each tailored to specific applications. Here are some factors to consider when choosing the right type of nail for your project:
Nail Types
The type of nail you choose depends on the nature of your project. Common nails, for instance, are the go-to option for framing, construction, and carpentry jobs. They feature a thick shank, a wide head, and a diamond-shaped point, making them ideal when strength and functionality take precedence over aesthetics. Box nails, on the other hand, resemble common nails but have thinner shanks, making them less likely to split thinner pieces of wood.
For woodworking projects, brad nails are a popular choice due to their versatility and ease of use. Typically 18-gauge, brad nails are of medium thickness, making them perfect for securing lightweight trim, small moldings, and other delicate wood pieces without causing splits. For more robust, heavy-duty projects, finish nails offer superior strength and can hold trim such as door jambs and crown molding in place.
If your project involves delicate, intricate work, pin nails are the ideal choice. These nails are the smallest and most delicate, typically 23-gauge, and are almost invisible once driven, making them perfect for veneer, delicate molding, and other detailed woodworking tasks.
For outdoor projects like fences, decks, or sheds, stainless steel nails offer superior durability, albeit at a higher cost. For pressure-treated lumber, hot-dipped galvanized nails are a suitable option, while zinc-plated nails are recommended for indoor applications.
Nail Size
Nail length is another crucial consideration. Nails may be labelled in inches or by the penny system (e.g., 16D nails), with higher numbers indicating longer nails. As a general rule, the nail length should be approximately three times the thickness of the material you're fastening. Additionally, the nail's gauge, which indicates its diameter or thickness, is important. Lower gauges denote thicker nails, while higher gauges indicate thinner nails.
Nail Design
The design of the nail also plays a role in its suitability for a particular project. The nail point, for instance, can be diamond-shaped or blunt. Diamond points are the most common, as they facilitate driving the nail and minimise wood splitting. Blunt points, while more challenging to drive, are designed to prevent splitting.
The nail shank, which provides holding power, can be smooth or spiral. Smooth shanks are easy to drive but offer less holding power. Spiral shanks, on the other hand, rotate as they are driven into hardwoods, preventing them from pulling out easily. For additional grip and resistance, especially in subflooring, annular ring nails or ring shank nails feature rings on the shank.
Nail Guns
If your project involves numerous nails, a nail gun can be a valuable tool. Different types of nail guns are available, each designed for specific applications. For instance, a finish nailer is ideal for trim work, while a brad nailer is perfect for delicate projects that require smaller, less visible nails. Framing nailers are suitable for larger projects, and roofing nailers are specialised for installing roofing materials.
In summary, choosing the right type of nail for your project depends on several factors, including the specific requirements, materials used, and scope of your task. By considering nail types, sizes, designs, and the availability of nail guns, you can make an informed decision to ensure a successful outcome.
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Wear safety glasses and watch the nail head when hammering
When it comes to hammering, safety should always be the top priority. Even if you think the task is small or insignificant, it's important to take the necessary precautions to protect yourself from potential hazards. One of the most important safety measures when using a hammer is to always wear safety glasses. Eye injuries are a common occurrence when hammering, as small particles or metal pieces can fly into the eyes, causing serious and sometimes permanent damage. By wearing safety glasses with a hard plastic or polycarbonate lens, you can protect your eyes from flying debris, dust, and other hazards. If you require corrective lenses, consider purchasing safety goggles that fit over your glasses or investing in prescription safety glasses.
Additionally, it's crucial to watch the nail head when hammering. This allows you to maintain control over the hammer and ensure that you are hitting the nail accurately. A proper grip is essential to prevent the hammer from slipping and causing injury. Place your dominant hand on the handle and your other hand on the hammer head for added control. Keep your fingers away from the striking surface, and always hold the hammer with both hands to avoid injury.
To further enhance safety when hammering, it is recommended to choose the right hammer for the job. Different types of hammers are designed for specific tasks, and using the wrong hammer can increase the risk of injury. Before using the hammer, inspect it for any damage or defects, and ensure that your work area is clean, organized, and free of tripping hazards. By following these safety precautions, you can reduce the risk of injuries and improve your overall efficiency when using a hammer to finish nails or for any other task.
It is worth noting that while hammering is a common method for finishing nails, there is a risk of denting the wood or missing the nail head. An alternative option is to use a nail gun, which can provide more precise nailing, although it also carries its own set of potential hazards. Ultimately, whether you choose to use a hammer or a nail gun, always prioritize safety by wearing the necessary protective gear and following proper techniques.
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Frequently asked questions
Yes, you can use a hammer to finish nails for trim. However, there is a chance you will miss and dent the wood. If aesthetics are important, consider using a nail gun instead.
You should use a smooth-faced hammer to finish nails for trim. The Estwing Hammer is a good option, as it is solid, has a smooth face, and features a genuine leather grip.
Nail length is designated by the letter "d" and is referred to as "penny." A 2d nail is one inch long, and each additional penny represents one additional inch of length. For rough carpentry work, use a three-inch or "16 penny common" nail.
When installing trim, never drive the head of a finishing nail flush with the surface of the wood, as your hammerhead will leave a dent. Leave it about 1/8 inch above the surface, then use a nail set and hammer to sink the head below the surface.
A nail set is a tool used to sink the head of a nail below the surface of the wood. For typical finishing nails, use a 1/32-inch nail set. Place the nail set inside the dimple centered on the finishing nail head, then gently tap it with a hammer until the nail head is flush with the surface.











































