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Types of Tube Fittings

  • Author:Agnes
  • Release on :2019-10-14

Types of Tube Fittings

Straight-through fittings, straight-through fittings, tee fittings, elbows, unions with live nuts, articulated joints, plugs, transition joints, etc.

The composition of the double ferrule joint: front snap ring, rear snap ring, nut.

Commonly used materials are stainless steel and carbon steel.

Metric, American and British thread standards NPT, PT, G are pipe threads.

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

PT is the abbreviation of Pipe Thread, which is 55 degree sealed conical pipe thread. It belongs to Wyeth thread family and is used in Europe and Commonwealth countries. Commonly used in the water and gas pipe industry, the taper is 1:16. National standards can be found in GB/T7306-2000.

G is a 55 degree non-threaded sealed pipe thread, belonging to the Wyeth thread family. Marked as G for cylindrical thread. National standards can be found in GB/T7307-2001.

In addition, the 1/4, 1/2, and 1/8 marks in the thread refer to the diameter of the thread size in inches.

Insiders usually use the points to refer to the thread size, one is equal to 8 points, 1/4 is 2 points, and so on.

G is the general name of the pipe thread (Guan), the division of 55, 60 degrees is functional, commonly known as the pipe circle. That is, the thread is machined from a cylindrical surface.

ZG is commonly called tube cone, that is, the thread is made of a conical surface. The general water pipe joints are like this. The old domestic thread mark is marked as Rc external thread for R.

The metric thread is expressed by the pitch of the thread, and the US and British thread is expressed by the number of threads per inch. This is the biggest difference between them.

The metric thread is a 60-degree equilateral tooth type, the inch thread is an isosceles 55-degree tooth type, and the US thread is 60 degrees.

Metric threads are used in metric units, and American-English threads are used in imperial units.

The pipe thread is mainly used for the connection of the pipe, and the inner and outer threads are closely matched, and there are two kinds of straight pipe and tapered pipe. The nominal diameter refers to the diameter of the pipe to which it is connected. It is obvious that the diameter of the thread is larger than the nominal diameter.

1/4, 1/2, 1/8 are the nominal diameter of the inch thread in inches.