# What Is The Difference Between Nominal And Actual Size?

## Why are lumber nominal and actual sizes different?

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).

The nominal measurement is made before the lumber is surfaced..

## Does nominal mean normal?

The relevant definition of “nominal” is, “as named.” Nominal, in this technical context, does not mean “normal.” It means as planned, as named, or as written (in the mission plan). Often, it means “within acceptable or expected boundaries.”

## Does nominal mean minimum?

Nominal does not mean minimal. In many financial cases, a “nominal” payment means that a trivial amount has been given, not for its value, which is insignificant, but because the payment marks the retention or resolution of a contractual structure. Because a nominal amount is small does not mean it is minimal.

## Is a 2×6 really 2×6?

In short, 2×6 are referred to as 2×6 because it’s easier to say and understood throughout the industry that we are only referring to its nominal dimensions vs its actual.

## Why is it called 5 4 board?

Five quarters, six quarters, eight quarters. It refers to the thickness of the wood, in quarters of inches. So 5/4 is 1 1/4″ thick, 6/4 is 1 1/2″ thick, and 8/4 is 2″ thick.

## What is nominal time?

Nominal and Actual time point and dose Similarly, Nominal Time is the planned time for the sample based on the Nominal time point, and the Actual Time is when the sample was actually drawn from the patient based on the entered date and time.

## What is meant by nominal size?

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 difference between nominal and actual dimensions of lumber?

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 do astronauts say nominal?

performing or achieved within expected, acceptable limits; normal and satisfactory; Example The mission was nominal throughout. So when the rocket performance is ‘nominal’ is it within expected and acceptable limits.

## What is a 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. The nominal size may correspond to a large number of highly standardized dimensions and tolerances.

## What does nominal mean on a drawing?

What does “nominal” mean when discussing a tolerance on a technical drawing? … A nominal value represents the middle value of a range acceptable to fill a specification. The tolerance represents the range. The lowest and highest value acceptable for that middle number.

## What is nominal behavior?

Off-nominal behaviors (ONBs) are unexpected or unintended behaviors that may be exhibited by a system. They can be caused by implementation and documentation errors and are often triggered by unanticipated external stimuli, such as unforeseen sequences of events, out of range data values, or environmental issues.

## What does 5 quarter mean?

Rob Johnstone: The “quarter system” is a metric for roughsawn lumber. It simply refers to how many 1/4-inches thick the rough stock is. … 5/4 is 1-1/4-in. thick, 12/4 would be three inches thick. If you surface rough stock smooth, you will usually lose about 1/4-in.

## What is actual size lumber?

Nominal vs. Actual Measurements of Dimension LumberNominal SizeActual Size2 x 41 1/2 x 3 1/2 inches (38 x 89 mm)2 x 61 1/2 x 5 1/2 inches (38 x 140 mm)2 x 81 1/2 x 7 1/4 inches (38 x 184 mm)2 x 101 1/2 x 9 1/4 inches (38 x 235 mm)14 more rows•Mar 27, 2020

## 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. Instead, a 2×4 is really only 1 1/2″ by 3 1/2″. The same is true of pine.