
Nails come in thousands of varieties, with different types of heads, shanks and points. Nail sizes are based on two measurements: diameter and length. A nail's gauge is a measurement of its diameter and is seen mostly on finishing nails. The higher the number, the thinner the nail is. A nail's length is measured from the head to the tip of the point. Nails 6 inches or longer are often referred to as spikes.
| Characteristics | Values |
|---|---|
| Unit of Measurement | Penny size (d) |
| Length | Nails 6 inches or longer are often referred to as spikes |
| Diameter | The higher the number, the thinner the nail |
| Shank | The thicker the shank, the less likely the nail is to bend |
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What You'll Learn

Penny size
Nail sizes are based on two measurements: diameter and length. A nail's 'gauge' is a measurement of its diameter and is seen mostly on finishing nails. The higher the number, the thinner the nail is. A nail's length is measured from the head to the tip of the point.
The shank of the nail refers to its longer portion driven into the material rather than the flat head. The thicker the shank, the less likely the nail is to bend when struck and driven into a hard surface. This is important, as usually a normal hammer is not enough to drive nails into concrete. Instead, it is common to use a 3 lb. or 5 lb. hammer for the job.
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Gauge
A nail's gauge is a unit of measurement referring to its diameter or thickness. The higher the gauge size, the thinner the nail. For example, a 12-gauge nail is thinner than a 5-gauge nail. The gauge of a nail is mostly seen on finishing nails.
Nail sizes are based on two measurements: diameter and length. The length of a nail is measured from the head to the tip of the point. Nails 6 inches or longer are often referred to as spikes.
The shank of the nail refers to its longer portion driven into the material rather than the flat head. The thicker the shank, the less likely the nail is to bend when it is struck and driven into a hard surface.
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Shank diameter
Nail sizes are based on two measurements: diameter and length. A nail's "gauge" is a measurement of its diameter and is seen mostly on finishing nails. The higher the number, the thinner the nail is. A nail's length is measured from the head to the tip of the point. Nail length is indicated by the letter "d".
The penny size is a standard unit of measurement for nails, abbreviated as "d". This measurement initially referred to the price of a nail. For example, a 16-penny nail is abbreviated as a 16d nail and is longer than an 8d nail. Nails 6 inches or longer are often referred to as spikes.
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Length
Nail sizes are based on two measurements: diameter and length. A nail's length is measured from the head to the tip of the point. The length is indicated by the letter 'd'. Nails 6 inches or longer are often referred to as spikes.
The penny size is a standard unit of measurement for nails, although it doesn't correspond precisely to another unit of measurement. For example, a 16-penny nail is abbreviated as a 16d nail and is longer than an 8d nail.
A nail's gauge is a unit of measurement referring to its diameter or thickness. The higher the number, the thinner the nail is. So, a 12-gauge nail is thinner than a 5-gauge nail. The shank of the nail refers to its longer portion driven into the material rather than the flat head. The thicker the shank, the less likely the nail is to bend when it is struck and driven into a hard surface.
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Types of nails
Nail sizes are based on two measurements: diameter and length. A nail's "gauge" is a measurement of its diameter and is seen mostly on finishing nails. The higher the number, the thinner the nail is. A nail's length is measured from the head to the tip of the point. Length is indicated by the letter "d". Nails 6 inches or longer are often referred to as spikes.
There are thousands of varieties of nails, created by combining different types of heads, shanks and points. The shank of the nail refers to its longer portion driven into the material rather than the flat head. The thicker the shank, the less likely the nail is to bend when it is struck and driven into a hard surface.
Joist hanger nails are made for both indoor and outdoor use. They are typically double-dipped galvanised or stainless steel and are specifically designed for installing joist hangers. Specialty nails include upholstery nails, corrugated fasteners, wood joiners and others designed for specific applications.
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Frequently asked questions
A nail's gauge is a unit of measurement referring to its diameter or thickness. Higher nail gauge sizes correspond to thinner nails, with smaller nail gauge sizes correlating to thicker, stronger nails.
The letter 'd' indicates a nail's length and is a standard unit of measurement for nails.
The shank of the nail refers to its longer portion driven into the material rather than the flat head. The thicker the shank, the less likely the nail is to bend when it is struck and driven into a hard surface.










































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