ANSI B1.20.1标准

NPT- National Pipe Taper Threads - ANSI B1.20.1

国家螺纹管标准 ANSI B1.20.1

Characteristics of NPT (also known as ANSI/ASME B1.20.1 Pipe Threads, General Purpo):

该标准规定:

tapered thread 1o 47' 锥形螺纹 1度47分

truncation of roots and crests are flat 顶部和根部的截断面是平的

60o thread angle 60度的螺纹断面角

pitch is measured in threads per inch 单位罗纹数以每英寸计算

Note! Pipe sizes do not refer to any physical dimensions. The outside diameter of a pipe or fitting

must be measured and compared to a table for size identification. A 3/4" NPT pipe thread has an

outside diameter - OD - of 1.050 inches.

备注：管的尺寸不是指物理容积。管的外部直径和属性必须以下面这个表格来确定。例如：

一个标准为3/4" NP马的典故 T的管外部直径为1.050英寸。

Each thread size has a defined number of threads per inch - TPI, or pitch. The 3/4" NPT pipe

thread has 14 threads per inch. Both the TPI and OD of the thread are required for positive

identification of thread size becau more than one size have the same TPI.

每种罗纹管每英寸有固定的罗纹数（单位的罗纹数）。TPI或pitch就是单位的罗纹数。 3/4"

NPT标准的罗纹管每英寸有14条罗纹。由于不同的标准中可能会出现同样的单位罗纹数。

因此每个标准必须有固定的单位的罗纹数（TPI)和固定的外部直径（OD)。

NPT - American Standard Pipe Tap谁是凶手 er Thread 1)

Pipe Size 管的尺红绿灯英语 寸

(inches) Threads per Inch 单位罗纹数

TPI - pitch Outside Diameter 外部直径

OD

(inches)

管的尺寸 单位罗纹数 外部直径

1/16" 27 0.313"

1/8" 27 0.405"

1/4" 18 0.540"

3/8" 18 0.675"

1/2" 14 0.840"

3/健脾补肾汤 4" 14 1.050"

1" 11-1/2 1.315"

1-1/4" 11-1/2 1.660"

1-1/2" 11-1/2 1.900"

2" 11-1/2 2.375"

2-1/2" 8 2.875"

3" 8 3.500"

3-1/2" 8 4.000"

4" 8 4.500"

5" 8 5联想电源管理软件 .563"

6" 8 6.625"

8" 8 8.625"

10" 8 10.750"

12" 8 12.750"

14" 8 14.000"

16" 8 16.000"

1) The taper is 1/16 inch in an inch, which is the same as 3/4 inch in a foot (angle 1o 47')

1） 锥度为每英寸1/16英寸和每英尺3/4英寸是一样的。

NPT threads are not interchangeable with NPS - National Pipe Straight - threads.

国家螺纹管标准和美国标准直管螺纹白底头像 （NPS）是无法互换的

NPT threads may look similar to ISO 7/1 threads. However, ISO and NPT threads should not be

mixed. ISO threads have 55o taper angle versus 60o for NPT. The NPT root and crest

configurations are also different from ISO. For ISO threads品牌知名度 pitch is usually measured in

millimeters (may be expresd in Inch). The pitch are different.

国家螺纹管标准可能会像ISO 7/1 国际标准化组织的7/1标准。但请不要将两种标准混淆。

国际标准化组织的7/1标准有55度的罗纹标准，而国家螺纹管标准则是60度。国家螺纹管

标准的顶部和底部和国际标准化组织的7/1标准也不相同。财务管理内容 因为国际标准化组织的7/1标准

通常是用毫米来度量的。罗纹也不同！

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