Caleb Foster
The d in 8d finish nails stands for penny, with the number indicating the length of the nail from head to tip. An 8d finishing nail is 2.5 inches long and has a shank diameter of 0.12 inches. Finishing nails are one of many types of nails, including common nails, box nails, and brad nails, each serving a different function.
| Characteristics | Values |
|---|---|
| Shank length | 2.5 inches |
| Shank diameter | 0.12 inches |
| Head diameter | 9/32 inches |
| Gauge | 10 |
| Penny size | 8 |
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What You'll Learn
The 'd' in 8d finish nails stands for 'penny'
The "d" in 8d finish nails stands for "penny", which is a standard unit of measurement for nails. The letter "d" is derived from the Roman coin called the "denarius", which was also the name for an English penny. The penny system of classifying nail sizes originated in England, where the nail size was named after the price of 100 nails of a given size. For example, a 16d nail is a 16-penny nail, which is 3.5 inches long.
The term "penny" now corresponds to the measurement of nails from the head to the tip, which is the nail length. The number before the "d" indicates the nail's length in inches. So, an 8d nail is 2.5 inches long, with a 0.12-inch shank diameter and a 9/32-inch head diameter.
The penny system is still used today, although retail boxes of nails are now also marked with the length in inches. This is because the penny size does not correspond precisely to another unit of measurement. Nails are also classified by their gauge, which refers to their diameter or thickness. A higher nail gauge size corresponds to thinner nails, while lower nail gauge sizes indicate thicker and stronger nails.
The "d" in 8d finish nails, therefore, stands for "penny", with the number before the "d" indicating the length of the nail in inches.
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$13.95
8d finish nails are 2.5 inches long
The "d" in 8d finish nails stands for "penny", with the number indicating the length of the nail. An 8d finishing nail is 2.5 inches long and has a shank diameter of 0.12 inches and a head diameter of 9/32 inches. This is a common nail size, along with 4d (1.5 inches), 6d (2 inches), 12d (3.25 inches), and 16d (3.5 inches). Nails are also referred to by their gauge, which refers to their diameter or thickness. A higher nail gauge size corresponds to thinner nails, while smaller nail gauge sizes indicate thicker, stronger nails. For example, a 12-gauge nail is thinner than a 5-gauge nail.
The "d" sizing system for nails has its origins in the Roman occupation of England. The "d" is derived from the denarius, a Roman coin that was also the name for an English penny. Nails used to be hand-forged, one at a time, and the number and "d" together indicated that one 16d (3.5-inch) nail cost 16 pennies. The penny system is a special classification of nail sizes that originated in England, where the nail size was originally named after the price of 100 nails of that size.
Today, nail sizes are also indicated by their length in inches, in addition to the penny size. This is a less confusing way of selling nails, as the length is explicitly stated. Nails come in various sizes and types, each serving a different function. For example, common nail types include box nails, brad nails, and finishing nails, while there are also framing nails, roofing nails, and drywall nails for specific applications.
When selecting nails for a project, it is important to consider the requirements of the work and the types of nails available. Nails are typically chosen based on their length, diameter, and head size. The length of the nail is crucial for ensuring proper fastening, while the diameter and head size affect the holding power and pullout resistance of the nail.
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Nails are sold by length and penny size
Nails are sold in various sizes and types to cater to different functions. The length of a nail is measured in inches and specified by a digit and the letter "D", which stands for "penny size". The penny system is a special classification of nail sizes that originated in England, where the size of a nail was named after the price of 100 (or 120) nails of a given size. For example, a 2-inch nail was sold for 2 pence per 120 nails, hence the name "2-penny" or "2d" nail.
The ""D" suffix in the names of nails, such as 8D and 10D, is related to the nail size. An 8D nail is 2.5 inches long, while a 10D nail is 3 inches long. Nails can also be classified based on their gauge, shank length, diameter, and head diameter. The gauge of a nail refers to its diameter or thickness, with higher gauge numbers indicating thinner nails. The shank refers to the longer portion of the nail that is driven into the material, and its length and diameter are measured in inches. The head diameter is an approximate measurement of the nail's head.
There are many common types of nails, including common nails, box nails, brad nails, finishing nails, framing nails, roofing nails, flooring nails, and drywall nails, each designed for specific applications. For instance, annular nails have threaded shanks that provide extra grip and are used in projects requiring extra holding power, such as subflooring and drywall replacement.
When selecting nails for a project, it is important to consider factors such as nail length, gauge, and pullout resistance. Nails are typically sold in packages that display the nail length in inches, along with the penny size. However, some packaging, especially for collated nails, may only show the length and omit the penny size. Additionally, the gauge measurement, which indicates the diameter or width of the nail, is commonly used for finish and trim work, where smaller-diameter nails create less visible holes.
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The penny system for nail sizes originated in England
The penny system for nail sizes is a classification that originated in England. The system was based on the price of 100 nails of a given size, with the "'d'" in the system standing for "penny". For instance, 16d stands for a 16-penny nail. The system corresponds to the measurement of nails from head to tip, with the nail length specified by a digit and the letter "D", indicating "penny size".
The penny system was originally referred to as the price for a hundred (100) or long hundred (120) nails in England during the 15th century. The larger the nail, the higher the cost per long hundred. For example, 1-inch nails were sold for 2 pence per 120 nails, hence why 2-penny or 2d nails are described as being 1 inch in length. On the higher end, 6-inch nails were sold for about 60 pence per 120 nails, which is why 60-penny or 60d nails refer to 6-inch nails.
From 2d to 16d nails, the penny size increases by one to two for every 1/4-inch of length added to the nail. For 20d nails and longer, the penny size increases by 10 for every 1/2-inch of length added. This means that a 2d nail is 1 inch long, a 4d nail is 1.5 inches, a 6d nail is 2 inches long, an 8d nail is 2.5 inches long, a 12d nail is 3.25 inches long, and 16d nails are 3.5 inches long.
While the penny system is still commonly used in the United States, it is becoming more common for professionals to refer simply to the length of the nail to avoid confusion. Most loose nail packaging now displays nail length in inches next to the penny size, and some packaging, particularly for collated nails, no longer includes penny size at all.
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Nails under 6 inches are not usually called spikes
Nails are available in thousands of varieties, with different types of heads, shanks, and points. Nails are typically measured in inches, and the length of a nail is usually described as the distance from the head to the tip.
The "penny system" is a special classification of nail sizes that originated in England, where the nail size was originally named after the price of 100 nails of a given size. The abbreviation for pennies is "d", so nail sizes are described as 2d, 3d, etc. For instance, a 2d nail is 1 inch long, a 4d nail measures 1.5 inches, a 6d nail is 2 inches long, an 8d nail is 2.5 inches long, and so on.
Nails that are 6 inches or longer are typically referred to as spikes. These longer nails, when galvanized, offer significantly enhanced holding power and are useful when anchoring in soft ground conditions, hot asphalt, or on shoulders.
Therefore, nails under 6 inches, such as the 8d finish nail at 2.5 inches, are not usually called spikes.
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Frequently asked questions
An 8d finishing nail is 2.5 inches long.
The 'd' in 8d stands for 'penny'. The penny system of classifying nail sizes originated in England, with the symbol 'd' derived from the Roman coin called the denarius, which was also the name for an English penny.
You can try looking for 8d finishing nails at your local hardware store or at online retailers such as Home Depot.
