However, because the pipe thread is generally expressed in English, the actual large diameter, medium diameter and small diameter are all larger than the diameter.
1 inch British pipe thread is 1/8 inch pipe thread, with an outer diameter of 9.729 mm and an inner diameter of 8.567 mm, with 28 threads per inch and a pitch of 0.907 mm. ..
The 2-point British pipe thread is 1/4 inch pipe thread, with an outer diameter of 13.458 mm, an inner diameter of 1 1.446 mm, and a pitch of 1.337 mm per inch. ..
Extended data
Pipe threads are threads located on the pipe wall for connection, including 55-degree unsealed pipe threads and 55-degree sealed pipe threads. It is mainly used to connect pipes to make their internal and external threads fit closely. There are two kinds: straight tube and conical tube.
Common pipe threads mainly include the following types: NPT, PT, G, etc.
British unit of length
After 1959, the American imperial inch and the British inch were unified as 25.4 mm in scientific application and commercial use, but the American system kept a slightly different "measurement inch" used in measurement.
1 inch) = 2.54 cm.
1 ft) = 12 inch? = 30.48 cm
1 yard) = 3 feet? = 91.44cm.
1 mile) = 1760 yards? = 1.609344 km (km)
The above conversion, the two units are the same, but the intermediate units such as chain (22 yards) and wave (220 yards) are used more in Britain.
References:
Baidu Encyclopedia: Pipe Thread Baidu Encyclopedia: English Units