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Thread Standard

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Thread Standard

Source:http://www.flowxgroup.com/Update Time:2014-04-04Hits:

1, introduction

 1) NPT National (American) Pipe Thread abbreviation, 60 degree taper pipe thread belongs to America standard, used in North America, GB refer to GB/T12716-2002.

 2) PT (BSPT) is the Pipe Thread abbreviation, is the 55 sealing taper pipe thread, which belongs to the Whitworth family, for Europe and the Commonwealth countries, commonly used in the water and gas pipe industry, taper 1:16, GB refer to GB/T7306-2000. The name for the ZG.

 3) G is 55 degree non thread sealing pipe threads of Whitworth family. Mark G stands for the cylindrical thread. GB refer to GB/T7307-2001.

2, the difference between

Metric thread with pitch to express, the thread is represented by the number of threads per inch;

Metric thread is 60 degrees equilateral tooth type, metric screw thread is isosceles 55 teeth, thread for the equilateral 60 tooth type;

Metric thread metric unit (such as mm), the thread in Imperial units (such as inches);

"Insiders" usually "points" to call thread size, one inch is equal to 8, 1/4 inch is 2 points, and so on.

In addition to: ISO - Metric thread standard 60 degrees; UN unified thread standard 60 degrees; API America petroleum pipe thread standard 60 degrees; W - British Whitworth standard 55 degree pvc ball valve  ;

The NPT BSP thread technology -- NPT, PT, G thread

NPT, PT, G all kinds of thread

NPT, PT, G are pipe thread

NPT is National (American) Pipe Thread abbreviation, 60 degree taper pipe thread belongs to America standard, used in North America. National standards can be found in GB/T12716-1991

PT is the Pipe Thread abbreviation, is the 55 sealing taper pipe threads of Whitworth, family, for Europe and the Commonwealth countries. Often used in the water and gas pipe industry, taper provisions of 1:16. national standards can be found in GB/T7306-2000

G is the 55 degree of non sealing pipe threads, belonging to the Whitworth family. Mark G stands for the cylindrical thread. National standards can be found in GB/T7307-2001 pvc butterfly valve

Another thread of 1/4, 1/2, 1/8 mark refers to the thread diameter, inches. The wife is usually used to call thread size, an inch is equal to 8, 1/4 inch is 2 points, referred to as the and so on.G pipe thread (Guan), 55, 60 degree belongs to functional division the, commonly known as the tube. The thread consists of a cylindrical surface processed.

ZG commonly known as cone, namely thread consists of a conical surface processing, pipe joints are generally such labeling, Rc metric thread with a pitch to express, the thread is represented by the number of threads per inch, this is the biggest difference between them, metric thread is 60 degree side tooth type, inch thread is isosceles 55 teeth, thread 60 degrees. Metric thread metric unit, the thread in Imperial units. Pipe thread is mainly used for connecting pipe, the thread tight, straight tube and cone tube two. Nominal diameter is the diameter of the pipe is connected, apparently thread diameter larger than the nominal diameter. 1/4, 1/2, 1/8 is the nominal diameter of the thread, the unit is in.

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