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Nails: Types, Uses, And Parts



Are you uncertain about whether you require common nails, box nails, or brad nails? Are you aware if you necessitate bright nails with smooth shanks or ring-shank nails with a hot-dipped galvanized finish? Our aim is to present you with various commonly used nail types and guide you in selecting the appropriate nail, size, and finish for your upcoming project.

The Parts of a Nail

Nails possess three primary components: a pointed tip that penetrates the work pieces, a shaft or shank that holds the work pieces together and offers significant strength, and a head that enables fastening and prevents the nail from slipping out of the work pieces. Variation in these components leads to different nail designs, each with distinct capabilities and uses.

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  • Diamond-shaped points are typical on nails designed for general use and make the nails easier to drive. Long diamond-shaped points help minimize splitting of the materials you’re joining.
  • A blunt point makes a nail harder to drive but less likely to split the work piece.

Nailheads are small, flat-headed metal studs used to attach materials together. They have a pointed end that is hammered into the material, while the flat head provides a secure fastening point.

  • Nails with round heads are often for general-purpose fastening and construction. A round head allows good contact with the hammer but creates a rougher finish than other types.
  • Flatheads are round and relatively large. They make driving the nail easier and reduce the risk of the work piece pulling through the head.
  • Checkered heads have a raised pattern, which helps prevent the hammer from slipping off the nail. 
  • Countersink and cupped heads are small — often not much larger than the diameter of the shank — and drive below the surface of the work piece to make the nail less visible. Cupped heads allow you to easily fill the nail holes for a smooth finish.
  • Clipped heads are relatively small D-shaped heads designed for use in strip nailers. They allow the nails to be collated or joined closely together in a line. 

Shanks, who is a nail.

  • A smooth shank is easy to drive but doesn’t offer much resistance against pullout.
  • A spiral shank or screw shank rotates the nail as you drive it, much like threads on a screw. The thread or flute on the shank makes the nail easier to drive and helps keep the nail in place. Spiral-shank nails are often designed for use with hardwoods and may cause splitting in softwoods. Nails with spiral shanks are also known as screw nails.
  • Ring-shank nails or annular nails are often used with softwoods. Like a spiral shank, the rings lock with the wood fibers to provide good holding strength.

Nail Sizes

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Nail length can be specified in inches or by the penny system, represented by a D (16D nails). Initially used to indicate the cost of 100 nails of a specific size in English pennies, the penny system now signifies nail length, with greater numbers indicating longer lengths.

The diameter represents the distance across a circle, passing through its center.

Typically, the diameter of the nail shank is indicated by its gauge. A smaller gauge signifies a larger diameter, while larger gauges signify narrower shanks.

If a building code is in place, it might specify the nail length required for a project, especially those related to structural work. In the absence of a specific requirement, it is generally recommended to use a nail length that is three times the thickness of the material being fastened.

Nail Materials and Finishes

The choice of nail material and finish determines the suitability of using a nail for various projects. While steel is the most frequently used material, it is prone to corrosion. Therefore, if steel nails are expected to come in contact with moisture or be utilized in pressure-treated wood, they must have a protective coating or plating that resists corrosion.

  • Bright nails are untreated steel, suitable for interior use.
  • Black phosphate is a coating for indoor applications. It works well for drywall nails because the coating creates good adhesion with paint and drywall mud. Black phosphate gives nails a gray or black appearance.
  • Zinc-plated nails have some corrosion resistance, but standard zinc plating is thin and best for indoor applications. Zinc plating adds a silvery or gold tint.
  • Hot-dipped galvanized nails work for outdoor use due to a thicker zinc coating. The finish adds a flat, gray color. Hot-dipped galvanized nails are suitable for pressure-treated lumber — which can corrode unprotected steel — but don’t work well for some wood species such as cedar and redwood. The coating reacts with oils in the lumber and can cause staining. 

Types of Nails

Common Nails

Common nails are used for general construction and specifically for framing and other structural work. They have a thick shank, a wide head, and a diamond-shaped point. They are most commonly used with 2 x dimensional lumber.

Their thickness makes them strong but also more likely to split wood than when compared to thinner nails. Some carpenters actually dull the nail tip to prevent splitting the wood, though to do so means the tip will tear the wood fibers, thereby slightly reducing the holding power.
A special type of common nail is the sinker, which has a slightly narrower shank and a special head designed to be sunk flush with the surface of the wood.
Box Nails
Box nails are similar to common nails and sinkers but have thinner shanks and are better suited to thinner wood materials, such as 1x (3/4-inch-thick) lumber and exterior trim. Box nails should not be used for structural projects because they don’t have the strength and the holding power of common nails. The thinner shank of a box nail is less likely to split thinner materials.
Duplex Head Nails
Duplex head nails are specialty nails useful for temporary construction, such as formwork for pouring concrete or attaching temporary cleats during roofing work. You drive the nail until the lower head is flush with the wood. When it’s time to disassemble the project, you can extract the nail using the upper head and the claw of your hammer or pull bar.
Annular Ring or Ring Shank Nails
An annular ring also called ring shank, nails have rings on their shanks for extra grip and additional resistance to pulling out of the wood. They are commonly used for installing subflooring, where the extra holding power can help prevent floors from squeaking. Other nails that may have rings include drywall nails or deck board nails, also for improved holding power.
Masonry/Concrete Nails
Masonry and concrete nails use hardened steel, often with longitudinal grooves along the length of the nail’s shaft to help them penetrate very hard materials by spiraling as they are driven. These nails are thick and very strong. They are designed to be fastened into concrete, concrete block, and mortar joints.
Casing/Finish Nails
Casing and finishing nails are similar, differing primarily in the shapes of their heads. A finishing nail has a small, slightly rounded head that is just slightly bigger than the nail shank. The head is designed to accept the pointed tip of a nail set, making it easier to countersink the nail without slipping and gouging the wood.
A casing nail essentially is ?a large finishing nail. It is often used in exterior applications, such as for installing exterior trim boards and for nailing door frames and trim. They are commonly galvanized for corrosion-resistance. The nail head of a casing nail is tapered and may be set flush or just below the wood surface.
Brad Nails
Brad nails (or brads) are used in light finish woodworking? and are essentially very small finishing nails. Because of the small shank diameter and the small head, these nails greatly reduce the possibility of splitting when used in hardwood.
Brads are ideal for general joinery and are usually countersunk below the surface of the wood using a nail set—the holes are then filled with putty for a finished appearance. Brad nails can be made for use in a nail gun (as pictured here) or to be hand-driven.
Roofing Nails or Clout Nails
Roofing nails, sometimes called clout nails, have a short shank and a wide, flat, thin head. They can be used to fasten shingles, roofing felt, or sheet metal to wood. The shanks can be smooth or ringed for increased pull-out-resistance.

Tips for Choosing and Using the Right Nails

Using the wrong size or type of nail can lead to a weak connection and potential harm to the wood or materials being joined. It is important to also take into account the nail finish, as certain finishes are necessary for exterior projects, while others, including brighter unfinished nails, are more suitable for interior projects.

Furthermore, there exist specialized techniques for driving nails that avoid causing splits in the wood you are connecting.

  • Be cautious driving too many nails along the same grain line of a piece of wood or you will risk splitting it.
  • Drilling pilot holes into harder woods before driving in a nail can prevent splitting the wood.
  • Blunting the nail’s point by slightly dulling the nail tip by gently tapping it with a hammer reduces the potential to split the wood.

Side notes

The process of how nails function is straightforward. As a nail is hammered into wood, its shaft forces the wood fibers apart while the tip goes through. The ability of a nail to stay in place is due to the basic friction between the displaced wood fibers and the shaft of the nail.


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