The Parts of a Nail
A nail has three basic parts: a point that drives into the work pieces, a shank or shaft that secures the work pieces together and provides much of the strength and holding power, and a head that allows you to drive the fastener and helps prevent the nail from pulling through the work pieces. Different nail designs in these elements give the nails different capabilities and applications.
Nail Points
- 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
- 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.
Nail Shanks
- 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.
Whether you're fastening through or into wood with nails or screws, a pilot hole helps prevent splitting. See How to Drill a Pilot Hole for tips on choosing the right bit for a pilot hole.
Nail Sizes
Length
Nail length may be indicated in inches or by the penny system, abbreviated with a D (16D nails). Originally an indication of how many English pennies it cost to purchase 100 nails of an individual size, now the penny system indicates nail length. Higher numbers mean longer lengths:
Diameter
You'll usually see the diameter of the nail shank indicated by gauge. A smaller gauge indicates a shank with a larger diameter. Larger gauges indicate narrower shanks.
The nail length you need for a project (particularly structural projects) may be specified by a building code. Without a definite requirement, a general guideline for a good nail length is three times the thickness of the top material you're fastening.
Nail Materials and Finishes
The nail material and finish help determine what projects you can use a nail on. Steel is the most common material, but it's vulnerable to corrosion. Steel nails that'll contact moisture or be used in pressure-treated wood need a corrosion-resistant coating or plating.
- 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.
Other finishes include paint and decorative brass, bronze and nickel plating, all best for indoor applications. Vinyl coating and coatings on fasteners for nailers make them easier to drive and act as adhesives to increase the holding strength.
Types of Nails
All nails serve the purpose of securing work pieces together, but in addition to that basic function, different nails are designed for different purposes, such as supporting structural hardware, standing up to the elements outdoors or allowing easy concealment. Here are some characteristics and uses for some of the most common nails.
Many fasteners are designed for specific purposes and aren't suitable for other applications, while some applications require particular fasteners. Building codes may specify what fasteners can be used with specific projects. Always follow code specifications and the fastener or structural hardware manufacturer's instructions.
Common Nails
Common nails work for general fastening projects, including construction work like framing and structural assemblies, as well as woodworking projects. These nails are best for fastening jobs where the strength of the nail matters more than the appearance. A common nail has a round head and a sturdy shank that provides strength.
Framing Nails
Like common nails, framing nails are also used for framing projects and craft projects. You'll often find these collated for use in framing nailers. They may have smooth, ring or spiral shanks, and depending on the type of nailer they work with, will have round or clipped heads.
Box Nails
Box nails have a design like common nails but with a narrower shank. This smaller diameter reduces the likelihood of splitting the wood components as you drive the nail. It also means the nails don't have the strength of common nails, so they aren't appropriate for structural applications.
Sinker Nails
Sinker nails typically have a checkered head that helps prevent the hammer from sliding off the nailhead. The heads are designed to drive flush with the work piece. The shank on a sinker nail will often be coated with vinyl to make the nail easier to drive and to make it hold better, but the coating doesn't provide corrosion resistance.
Deck Nails
Like sinker nails, deck nails often have a checkered head for better contact with the hammer. They may have smaller diameter shafts to minimize splitting. The shanks often feature rings or a spiral flute to help hold the nail in place. Deck nails have a corrosion-resistant finish that allows then to be used outdoors and with treated lumber.
Roofing Nails
Roofing nails secure asphalt shingles, roof felt and roof decking or sheathing. Since they're exposed to the elements, they may be made of aluminum or have a finish that protects against corrosion. Some feature a gasket under the head to create a weather-resistant seal. Roofing nails have larger than usual heads for their shank diameter, and the ringed or spiraled shanks are sturdier than usual for their length.
Masonry Nails
Masonry nails fasten wood to brick, mortar, concrete block or uncured concrete. They're made from hardened steel to allow driving into these materials. Some are cut to a flat, angular shape. Extruded masonry nails are usually short and thick, with round, fluted or grooved shanks. The flutes spin the nail as it's driven, making it easier to drive.
Siding Nails
Siding nails secure wood and fiber cement siding to a structure. Since they're exposed to the elements, they're made of corrosion-resistant material or have a corrosion-resistant finish. Siding nails may have small heads to make them inconspicuous after they're installed, and ringed or spiral shanks for holding power.
Joist Hanger Nails
Joist hanger nails are for attaching joist hangers to wood studs. These nails have a sturdy shank to provide strength and will often be hot-dipped galvanized for exterior use and for use with treated lumber.
Duplex Nails
Duplex nails are for temporary work such as constructing scaffolding or building forms for concrete projects. They have two heads along the shank, one that secures the nail against the work piece and one that allows for easy removal.
Pole Barn Nails
Pole barn nails are for construction projects that use wood poles set in the ground to form the foundation of the structure. Pole barn nails have ring shanks for holding strength and a corrosion-resistant finish that's compatible with pressure-treated wood.
Connector Nails
Connector nails are designed for attaching structural hardware such as framing angles and rafter ties.
Cap Nails
Cap nails feature a plastic cap just under the nailhead to secure house wrap, felt or foam insulation and prevent tear out. The nails have a spiral shank that keeps the fastener in place.
Trim Nails
Trim nails are designed for exterior use on homes. They secure home gutters, fascia and soffit board as well as exterior trim.
Finish Nails
Finish or finishing nails are used in fine carpentry and cabinetry, and work well for moulding. A small diameter shaft (often 16- to 10-gauge) reduces the chance of splitting the work piece. Finish nails have small heads that can either be driven flush to the work piece or countersunk — driven below the surface with a nail set — to conceal them from view.
Brad Nails
Brads nails are smaller versions of finish nails. They don't have the holding strength of finish nails but are good for woodworking, cabinetry and craft work. Like finish nails, brad nails have heads only slightly larger than the diameter of the shaft to allow countersinking.
Pin Nails
Pin nails are for use with nailers. These have a very small diameter (23 gauge) and no head. The don't have a lot of holding power but they're inconspicuous and can be combined with glue to secure thin veneer and small pieces of moulding and trim.
Drywall Nails
Drywall nails have large, round heads that may be dimpled or designed for countersinking. These features allow them to be easily driven below the surface of the wallboard for concealment and minimize tearing of drywall paper. You'll also see long diamond-shaped points designed to reduce splitting of wall studs. You can find drywall nails with smooth shanks or with ringed shanks to help keep them in place.
Panel Board Nails
Panel board nails have small, round heads and are used for fastening wall panels to studs or furring. Some have ring shanks for holding power, and they're often available painted in different colors to match the panels you're installing.
Flooring Nails
Flooring nails include nails designed for use in pneumatic nailers for installing some types of wood flooring, as well as short spiral nails that secure flooring trim and nails with longer, ringed shanks for installing underlayment or subflooring.
Furniture Nails
Furniture nails or upholstery nails are small nails with relatively large, decorative heads. Their primary function is to secure upholstery fabric to a wood frame.
Nails work best for some fastening jobs while screws work best for other projects. Watch When Do I Use Nails vs. Screws? and read our Screws Buying Guide to find the right fastener for your work.
Nails for Nailers/Nail Guns
Nails for nailers or nail guns are available in different types including common, framing, finish, siding and roofing. Nail gun nails are joined or collated into coils or strips and connected by wire, plastic, glue or paper. Degree measurements indicate the angle the nails are collated. Make sure you match the nailhead type, collation type and angle to your nailer.
Don't know whether you need a coil nailer or a strip nailer? Wondering about the difference between a framing nailer and a finish nailer? See our Nail Gun Buying Guide, and learn how to find a nailer to fit your project.