Noah Sinclair
In the United States, the length of a nail is designated by its penny size, written with a number and the abbreviation 'd' for penny. For example, a twenty-penny nail (20d) typically has a length of four inches. 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 nails 20d and longer, the penny size increases by 10 per 1/2 inch of length.
| Characteristics | Values |
|---|---|
| Length | 4 inches |
| Abbreviation | 20d |
| Gauge | 6 |
| Type | Common Nails |
| Use | Most wood-to-wood outdoor applications |
| Material | High-strength steel |
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What You'll Learn
20-penny nails are typically four inches long
In the US, the length of a nail is designated by its penny size, written with a number and the abbreviation "d" for penny. For example, a 10-penny nail is written as 10d. A larger number indicates a longer nail. 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 per 1/2-inch of length.
Twenty-penny nails, abbreviated as 20d, typically have a length of four inches. This standard length is reflected in products like Grip-Rite's 4-inch x 6-gauge 20-penny exterior galvanised smooth shank common nails.
While penny size is still commonly used in the US, it is becoming more common for professionals to refer simply to the length of the nail to avoid confusion. Most loose nail packaging prominently displays nail length in inches next to the penny size. Some nail packaging, particularly collated nails, no longer includes penny size at all.
The term "penny" in the context of nails originates from the 15th century in England, where it referred to the price for a hundred or long hundred (120) nails. The larger the nail, the higher the cost per long hundred. This system remained in use in England into the 20th century but is now obsolete there. Nails are still designated in penny sizes in the US and Canada, where they are manufactured to Imperial dimensions.
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They are designated by the number and d for penny, e.g. 20d
In the United States, the length of a nail is designated by its penny size, written with a number and the letter "d" for penny. For example, a twenty-penny nail is written as 20d. Nails under 1+1⁄4 inch, often called brads, are sold mostly in small packages with only a length designation or with length and wire gauge designations. From there, the penny size increases by one to two for every 1/4-inch of length added to the nail. For instance, 2-penny or 2d nails are 1 inch in length, while 60-penny or 60d nails refer to 6-inch nails. For 20d nails and longer, the penny size increases by 10 per 1/2-inch of length.
While the penny system is still commonly used in the US, it is becoming more common for professionals to refer simply to the length of the nail to avoid confusion. Most loose nail packaging now prominently displays nail length in inches next to the penny size. Some nail packaging, particularly collated nails, no longer includes penny size at all. Instead, gauge, a measurement of diameter or width, is commonly used.
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They are used for wood-to-wood outdoor applications
20-penny nails are commonly used for wood-to-wood outdoor applications. These nails are typically made from high-strength steel, offering robust durability for outdoor projects. They are available in various pack sizes, including 1 lb, 5 lb, and 30 lb boxes.
The length of a nail is designated by its penny size, with the larger the number, the longer the nail. 20-penny nails are on the longer side of the spectrum, measuring 4 inches in length. This measurement is often displayed on packaging in inches, alongside the penny size.
These nails are designed as hand-drive fasteners, ideal for joining two pieces of wood together in outdoor settings. Their durability and length make them suitable for various outdoor projects, such as building decks, constructing outdoor furniture, or securing wooden structures.
When working with 20-penny nails, it is important to consider the gauge, which refers to the diameter or width of the nail. The gauge of 20-penny nails is typically 6-gauge, which is an important specification, especially when using power nailers to avoid jamming issues.
Overall, 20-penny nails are a versatile and durable option for wood-to-wood outdoor applications, providing a secure and long-lasting fastening solution for a range of projects.
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They are made from high-strength steel
A 20-penny nail, or 20d nail, is four inches long. The penny system of designating nail length is based on ancient Roman currency, with the penny being short for the denarius, the most common silver coin. In the 15th century, the penny size referred to the price for a hundred or long hundred (120) nails in England. The larger the nail, the higher the cost per long hundred.
Today, nails are typically made from steel wire. Steel is an alloy made from iron and carbon, and the more carbon it contains, the stronger the steel. Nails for masonry applications are tempered and have a higher carbon content than ordinary nails for wood, which are usually made from soft, low-carbon or "mild" steel (about 0.1% carbon).
Steel is an ideal material for nails because it is strong, durable, and inexpensive. The strength of steel nails allows them to withstand the forces exerted on them when they are used to join materials together. Steel is also highly malleable, which means it can be easily shaped into the form of a nail. The nail-making process involves feeding a thick, continuous steel wire into a machine, where it is cut to the desired length and one end is flattened into a head.
Steel wire nails began to be produced in the United States in the late 19th century and quickly overtook iron cut nails as the main type of nail being produced. This was due in part to the development of machines that could quickly produce large numbers of inexpensive nails with little or no human intervention. Today, nail-making machines can produce up to 700 nails per minute.
In addition to carbon steel and iron, nails can also be made from other materials such as stainless steel, copper, aluminium, brass, bronze, nickel, silver, monel, zinc, and even gold. The type of material used depends on the application and the degree of holding power required. For example, copper nails are used with copper flashing or slate shingles, while aluminium nails are often used with aluminium architectural metals.
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They are sold in 1-pound boxes
In the United States, the length of a nail is designated by its penny size, written with a number and the abbreviation "d" for penny. For example, a twenty-penny nail (20d) typically has a length of four inches.
Twenty-penny nails are commonly used for wood-to-wood outdoor applications. They are made from high-strength steel for robust durability. These nails are available in 1-pound boxes, which typically contain 20-penny common nails with a 6-gauge and a 4-inch length.
The penny system of measurement for nails originated from ancient Rome, where the word "penny" is derived from the Latin name of the most common silver coin, the "denarius." Over time, the penny size for nails came to be associated with its length. For nails up to 16d, the penny size increases by one to two for every 1/4-inch increment in length. For longer nails, such as 20d and above, the penny size increases by 10 for every 1/2-inch increase in length.
While the penny system is still used in the United States, professionals increasingly refer to nail length in inches to avoid confusion. Nail packaging often displays the length in inches alongside the penny size. For collated nails, the gauge, or diameter, of the nail is also an important measurement, especially in finish and trim work where smaller-diameter nails are preferred to create less visible holes.
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Frequently asked questions
20-penny nails are typically four inches long.
"Penny" is a unit used to designate the length of a nail, written with a number and the abbreviation "d", for example, "10d" for a ten-penny nail.
While the penny size is still used in the United States, it is becoming more common for professionals to refer to the length of the nail in inches to avoid confusion. Some nail packaging, especially collated nails, no longer includes penny size.
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 per 1/2 inch of length.
"Gauge", a measurement of the diameter or width of the nail, is also commonly used. This is particularly important in finish and trim work, where smaller diameter nails are preferred to create less visible holes.
