1/4FL*3/8NPT是什么意思?

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NPT 是 National (American) Pipe Thread 的缩写,属於美国标准的 60 度锥管螺纹,用於北美地区．国家标准可查阅 GB/T12716-1991.
国家标准可查阅 GB/T7307-2001 另外螺纹中的1/4、1/2、1/8 标记是指螺纹尺寸的直径,单位是英吋．行内人通常用分来称呼螺纹尺寸,一吋等於8分,1/4 吋就是2分,如此类推．
Common American National Standard Pipe Taper Threads
NPT - National Pipe Thread Taper
FPT - female (internal) National Pipe Taper threads
MPT - male (external) National Pipe Taper threads
NPTF - Dryseal American National Standard Taper Pipe Thread (ANSI B1.20.3)
For NPT threads a sealant pound or Teflon tape must be used for a leak-free seal. For NPTF
no sealant is needed for a sealing.
Characteristics of NPT (also known as ANSI/ASME B1.20.1 Pipe Threads, General Purpose):
tapered thread 1o 47'
truncation of roots and crests are flat
60o thread angle
pitch is measured in threads per inch