Pipe threads in USA,

Pipe threads, also known as fittings, are used to connect pipes and other components in a plumbing or piping system. There are several different types of pipe threads used in the United States, each with their own unique characteristics and purposes.The first type of pipe thread is the National Pipe Thread (NPT). This is a tapered thread that is commonly used in residential and commercial plumbing systems. NPT threads are designed to create a tight seal when two pipes are joined together, and they are often used with pipe fittings such as elbows, tees, and couplings.Another type of pipe thread is the National Pipe Straight Mechanical (NPSM) thread. This is a straight thread that is used with mechanical joints and pipe fittings. NPSM threads are typically used in industrial applications, and they are not designed to create a seal when two pipes are joined together.The National Pipe Taper Fuel (NPTF) thread is also used in the United States, typically in fuel systems. This thread is similar to the NPT thread, but it is designed to be more resistant to vibration and movement. NPTF threads are commonly used in automotive, aviation, and marine applications.Finally, the British Standard Pipe (BSP) thread is also used in the United States, particularly in imported equipment and machinery. This thread is similar to the NPT thread, but it has a slightly different thread angle and pitch. BSP threads are commonly used in Europe and Asia, but they are also found in the United States in imported equipment.In conclusion, there are several different types of pipe threads used in the United States, each with their own unique characteristics and purposes. National Pipe Thread (NPT) is the most common type used in residential and commercial plumbing systems, while National Pipe Straight Mechanical (NPSM) and National Pipe Taper Fuel (NPTF) are typically used in industrial and fuel systems respectively. British Standard Pipe (BSP) thread is also used in the United States, particularly in imported equipment and machinery.