# Question: Why Are Lumber Nominal And Actual Sizes Different?

## What is the nominal thickness?

Nominal thickness is “in name only” used solely for identification.

The nominal size may not match any dimension of the product, but within the domain of that product.

Actual thickness of the glass can range between 1/32″ to 1/16″ depending on the nominal thickness..

## What is the difference between nominal and actual sizes in lumber?

Nominal measurements traditionally refer to the size of the board when it was first rough cut, before it was dried and planed (smoothed). Actual measurements are the actual final size of the lumber after it has been dried and planed.

## What does nominal size mean in lumber?

Nominal vs. actual lumber dimensions: … Lumber sizes are usually given in “nominal” measurements. The nominal measurements are a board’s size before it has been planed smooth (surfaced) on all 4 sides. The actual measurements are the final size.

## Why is a 4×4 actually 3.5×3 5?

no, it is just a bit over 3.5″x3. 5″ for clearance. 2×4 and 4×4 boards are no longer the actual number, but as you state–they are 1/2″ LESS. the base fits nicely to a standard 4×4.

## Why is lumber 1/2 inch smaller?

Lumber manufacturers typically cut a tree into the various standard types of dimensional lumber very shortly after the tree is felled. At this point, the 2 x 4 is actually 2 inches x 4 inches, a 2 x 10 is actually 2 inches x 10 inches, etc. … Hence, what started out as a 2 x 4 now measures 1 1/2 inches x 3 1/2 inches.

## Is size nominal or ordinal?

In ordinal scales, values given to measurements can be ordered. One example is shoe size.

## What does nominal mean?

Nominal is a common financial term with several different meanings. In the first, it means very small or far below the real value or cost. In finance, this adjective modifies words such as a fee or charge. … Nominal may also refer to a rate that’s been unadjusted.

## What does nominal cut mean?

The label put on the lumber you buy is called the “nominal” lumber size. The actual size is always a little bit smaller. Nominal refers to the dimension the lumber was sawn. When a 2×4 is cut out of a log it is 2″x4″. After the board is dried and planed it becomes its actual size of 1 1/2″x3 1/2″.

## What is the actual thickness of 5/4 lumber?

Hardwood Lumber DimensionsNominal SizeRough SizeActual Size: Surfaced 2 Sides5/4 inch1 1/4 inch1 1/16 inch (27 mm)6/4 inch1 1/2 inch1 5/16 inch (33 mm)8/4 inch2 inches1 3/4 inch (44 mm)12/4 inch3 inches2 3/4 inch (70 mm)5 more rows•Apr 30, 2020

## When did lumber dimensions change from actual to nominal?

Early concepts called for rough lumber to be of full nominal size, often in the dry condition. After World War I, the increasing demand for construction lumber led to the first national size standard in 1924. This was revised in 1926, 1928, 1939, and 1953, while still another revision is proposed for adoption in 1964.

## What is the difference between actual and nominal?

Nominal size is the size you see printed on the side of your air filter. It stems from the actual size, which is rounded up to the nearest whole inch.

## Why are lumber sizes wrong?

Maybe you’ve noticed that lumber sizes are often misleading. The “nominal” cross-section dimensions of a piece of lumber, such as 2 X 4 or 1 X 6, are always somewhat larger than the actual, or dressed, dimensions. The reason is that dressed lumber has been surfaced or planed smooth on four sides (called S4S).

## What does nominal size mean?

In manufacturing, a nominal size or trade size is a size “in name only” used for identification. The nominal size may not match any dimension of the product, but within the domain of that product the nominal size may correspond to a large number of highly standardized dimensions and tolerances.

## What is the best grade of hardwood lumber?

Standard Grades of Hardwood LumberGradeTrade NameMin. Area of Clear Cuttings RequiredFirst & SecondsFAS83-1/3%FAS 1-FaceF1F83-1/3%SelectSEL83-1/3%No. 1 Common1C66-2/3%3 more rows

## Why is it called 2 4s?

DIMENSIONAL LUMBER: In the past, when a timber was called a 2×4 [or “two-by-four”], it actually measured 2 inches by 4 inches. … Because of this extra milling, a 2×4 no longer measures a full 2 inches by four inches.

## Why is it called 5 4 board?

It simply refers to how many 1/4-inches thick the rough stock is. For example, 4/4 (read out loud as four-quarters) is 1-in. thick in the rough. 5/4 is 1-1/4-in.

## Is a 2x4x8 actually 8 feet long?

Standard pre-cut wall studs are: 92 5/8″ for 8′ walls, 104 5/8″ for 9′ walls, 116 5/8″ for 10′ walls.

## Is a 4×4 really 4 inches?

For most wood posts, however, the term “four by four” actually refers to the post’s nominal size. This might come as a surprise to some of you, but that “4×4″ wood post in your yard likely does not measure 4 inches by 4 inches. … The end result is a post that actually measures approximately 3.5″ by 3.5” (actual size).