Easily distinguish between British and American threads

American thread (NPT/ NPS)

American National Standard Pipe Thread standards (American National Standard Pipe Thread standards), commonly referred to as the National Pipe Thread standards, It is the national thread technical standard used on threaded pipes and fittings in the United States. Its standard includes conical and parallel teeth for a variety of uses, including rigidity, pressure sealing, or both. Because of its use, there are various subdivision types of abbreviation, the common NPT, that is, the abbreviation of the United States taper teeth, and the other United States parallel teeth are referred to as NPS. Mainly used in North America.

The thread Angle (the Angle between the side of the thread and the vertical face of the bolt axis) is 60 degrees.

The spiral peak/spiral valley (the most prominent top of the thread is called the spiral peak, and the low point of the most concave thread is called the spiral valley) presents an acute Angle.

American thread (NPT/NPS)

American taper teeth: generally called NPT (National pipe taper), the full name is: American National Standard Taper Pipe Thread American national standard taper pipe thread is commonly used in general industrial components. It is often used to seal industrial components that cannot or do not require any seals, and has a wide range of applications.

American taper teeth: generally called NPT (National pipe straight, full name is: American National Standard Straight Pipe Thread. American national standard straight pipe thread. American national standard straight pipe thread. For rigid requirements, seals need to be used; Sometimes, parallel male teeth are used to lock into conical female teeth as a low pressure seal.

Inch thread (BSPT, R/ BSPP, G)

British Standard Pipe (BSP) is an internationally widely used thread standard (tooth gauge), including the combination of external and internal threads (female). As well as the NPT standard, it has often been used as a dental gauge standard for pipes and pipe fittings.

The thread Angle is 55 degrees.

Spiral peaks/valleys show rounded corners.

Inch thread (BSPT, R/ BSPP, G)

British Taper teeth: Generally referred to as BSPT (The British Standard Pipe Taper), the current name has been replaced by "R teeth", but BSPT is still one of the common names.

British standard parallel teeth: It is commonly referred to as G teeth, BSPP (The British Standard Pipe Parallel), BSPM, or BSP, while BSPF (British Standard Pipe Fitting) is another name for parallel teeth. The name BSPF was changed to solve the confusion caused by the pronunciation of BSPP and BSPT (conical teeth) in the past.

However, the term BSPF can still cause confusion in related industries when used together with the American National Standards Institute's oil-free sealed cone teeth. The American National Standards Institute has NPT/ NPTF two Taper gauges, of which NPTF (National Pipe Taper Fuel) is the oil-free version of the taper gauge. BSPF and NPTF, because the pronunciation of the ending P and T is similar at first sound, and the ending is F, even if the former is parallel teeth and the latter is conical teeth, it is still easy to produce another possible confusion.

In order to solve this problem, BSPF was changed to BSPM (British Standard Pipe Mechanical), and in this way, The purpose is to communicate the parallel tooth identity of BSPM to the industry in accordance with the logic of the National Bureau of Standards parallel tooth gauge name NPSM (National Pipe Straight Mechanical).