公称尺寸只是我们期望得到的某一数值，而不是实际值。公称尺寸在英文中叫做Nominal Dimension, Nominal在英文中其实就有“不切实际”的意思，有很多时候我们也称之为名义尺寸，也就是纸面上的有名无“实”的尺寸。

2018年7月27日 · What is Nominal vs Actual? When we talk about Nominal vs Actual, we are referring to the size of materials. This is particularly relevant to structure, such as the timer/lumber sizes. In North America one of the most common lumber sizes is 2×4. So, you would think that when you draw a wall with 2×4, that the dimensions would be 2″ by 4 ...

2022年7月22日 · The typical nominal dimensions for wood, such as 2 x 4, refer to the thickness and the width of the wood. If a third number is added onto the nominal dimensions, such as 2 x 4 x 96, it indicates the length of the wood.

标称尺寸（nominal dimensions/size）是标明规格的尺寸,如M10代表了大径为10mm的螺纹尺寸,其相应的大径、中径和小径的基本尺寸均已进行相应的规定.英文简写Nom.

What's the difference between lumber and timber? Nominal lumber refers to the size of lumber after it has been rough-sawn, meaning the initial cuts made to divide a log into boards. The surface of these boards are rough and full of splinters and saw marks can usually be seen.

公称尺寸（Nominal size），又叫名义尺寸，它是对零件设计时指定的 尺寸。 是标准中规定的名义尺寸，是用户和生产企业希望得到的理想尺寸，在这种名义尺寸之下，只有根据不同种类的配合，给定了不同的公差，这才是机械加工的实际掌握的尺寸。 例如，图纸上注有一轴的尺寸为∮40（+0.2 -0.1），其中尺寸40就是公称尺寸。 零件的制造，极难绝对精确地获得一个指定的尺寸，总要有一点偏差，例如∮40（+0.2 -0.1），就是允许最大做成∮40.2毫米，最小做成∮39.9毫 …

Nom是Nominal的缩写，标称尺寸（nominal dimensions/size）是标明规格的尺寸，如M10代表了大径为10mm的螺纹尺寸，其相应的大径、中径和小径的基本尺寸均已进行相应的规定。 尺寸标注后面的NOM是什么意思?NOM是指标称尺寸，Nominal的缩写。 nominal读音：英 [ˈnɒmɪnl] 美 [ˈnɑːmɪnl] adj. 名义上的；有名无实的； [会计] 票面上的n. [语] 名词性词短语：1、n.

2023年3月18日 · Dimensional lumber is cut to a specific length, width, and depth. However, there is a difference between the nominal size (what the lumber is referred to) and the actual size. The tables below provide both the nominal and actual lumber dimensions for many common North American lumber sizes.

2024年9月26日 · Most lumber is sold in “nominal” (in name only) sizes. But these sizes are not the actual dimensions of the wood. The chart below shows the actual dimensions of lumber when it is dry (when wet, it will be slightly larger). This handy chart will help you translate the nominal into the actual (dry).

2024年9月17日 · In concrete and masonry, nominal sizes help standardize block and brick dimensions for ease of construction. Nominal dimensions simplify the process of calculating quantities and fitting units together, even though the actual dimensions might slightly vary.