Common thread classification for pressure sensor transmitters

2There are many types of threads for pressure sensors, commonly including NPT PT、G、M， They are all pipe threads.
NPT stands for National (American) Pipe Thread, a 60 degree taper pipe thread that is a standard for pressure sensors in the United States and is used in North America National standards can be found in GB/T12716-1991
PT stands for Pipe Thread, which is a 55 degree sealed conical pipe thread belonging to the Wyeth pressure sensor thread family and commonly used in Europe and Commonwealth countries Commonly used in the water and gas pipe industry, the taper is specified as 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 pressure sensor thread family The symbol G represents cylindrical thread. National standards can be found in GB/T7307-2001
M is a metric ordinary thread, such as M20 * 1.5, which means a diameter of 20mm and a pitch of 1.5. If the customer has no special requirements, the pressure sensor is generally M20 * 1.5 thread.
In addition, the 1/4, 1/2, and 1/8 markings in the thread refer to the diameter of the thread size, measured in inches. Insiders usually refer to thread size in minutes, with one inch equal to 8 minutes, 1/4 inch equal to 2 minutes, and so on. G seems to be the general term for pipe threads (Guan), and the 55 and 60 degree divisions are functional, commonly known as pipe circles. The thread is machined from a cylindrical surface.
ZG, commonly known as pipe cone, refers to a thread that is machined from a conical surface. This is how most water pipe pressure joints are made, and the old national standard is labeled as Rc
Metric threads are represented by pitch, while American and British threads are represented by the number of threads per inch. This is the biggest difference between pressure sensor threads. Metric threads have a 60 degree equilateral profile, British threads have an isosceles 55 degree profile, and American threads have a 60 degree profile. Metric threads are measured in metric units, while American and British threads are measured in imperial units.
Pipe threads are mainly used for connecting pressure pipelines, with tight fit between internal and external threads. Pressure sensor pipe threads come in two types: straight pipe and tapered pipe. The nominal diameter refers to the diameter of the pressure pipeline connected, and obviously the larger diameter of the thread is larger than the nominal diameter. 1/4, 1/2, and 1/8 are the nominal diameters of imperial threads, measured in inches.