First of all, BSP and G, the two are not the same thing.
The full name of the BSP thread is British Standard Pipe Thread, referring to the British standard pipe thread, belonging to Wyeth thread (BS 84) category.
BSP thread is divided into two types according to the shape: cylindrical pipe thread BSPP (British Standard Pipe Parallel) and taper pipe thread BSPT (British Standard Pipe Taper). As mentioned earlier, BSP thread belongs to a kind of Wyeth thread, so the tooth angle is 55 degrees,
Inch pipe thread BSPP (British Standard Pipe Parallel)
BSPP - inch tube thread. Some literally translated into parallel pipe threads, Xiaobian feel a little wrong. Corresponding to the other pipe thread called "taper pipe thread", which is the conventional name, but also the standard textbook title. If the translation of the British Pipe Parallel into a parallel pipe thread, it may make people feel a little touch of mind, and not professional enough, Standard.
Historical reasons, BSPP and other different names. Common such as BSPF (British Standard Fitting), BSPM (British Standard Pipe Mechanical) and PS (British Standard Pipe Straight), etc..
However, with the later ISO standard, these eight kind of Wuhua call all replaced with a simple letter.
This is the G thread.
Therefore：
G = BSPP = BSPF = BSPM = PS =......
Letter G is the abbreviation of Gas (that is, from the German Gewinde, "thread" means, small series tend to the former), because the first is used in the gas pipeline. And the reason why we call G pipe thread, because the G and tube (Guan) of the first letter of the alphabet the same reason, it is a coincidence.
G two screw with inner and outer threads for non sealing connection. The implementation of the standard is BS ISO 228-1, the old standard is BS 2779, is now obsolete, EN.
In addition, the meaning of several common versions of the standard:
ISO-xxx = International Standard = International Standard
EN-ISO-xxx = European of International Standard = International Standard Version of the
BS-EN-ISO-xxx = British of the version the International Standard = English version of the European version of the international standard in (European = version)
If necessary, the above mentioned thread standards can be concerned about the public number after the reply BSP free download (PDF format).
Inch taper pipe thread BSPT (British Standard Pipe Taper)
BSPT - Inch taper pipe thread, also known as PT thread, only for general seal connection. BSPT old standard for BS 21, and in the new standard BS EN 10226-1, with R thread instead.
Therefore：
R = BSPT = PT =......
The letter R comes from the German Rohr, meaning "tube". R thread is actually a series of common Rp, Rs, Rc, R1 and R2. Specifically as follows:
Rp - Inch sealed cylindrical internal thread
Rs - Inch sealed cylindrical external thread
Rc - Inch sealed taper thread
R1 - Imperial seal cone external thread, and Rp with the use of, that is, Rp/R1 "column / cone" fit
R2 - Imperial seal cone external thread, and Rc with the use of, that is, Rc/R2 cone / cone with
It can be seen that the general seal British pipe thread is divided into two kinds: cylindrical pipe thread and taper pipe thread. Sealed with cylindrical pipe thread (Rp) design and non - sealed tube thread G is completely consistent, the difference is that the accuracy of the thread. The sealing of the taper pipe thread (R) on the basis of the cylindrical pipe thread according to the technical transformation of 1:16 taper.
From the above can be seen, simply that BSP refers to the G thread is not accurate.
General sealing thread with cylindrical tube (Rp) necessary sealing effect by adding sealing filler in the thread (e.g. teflon seal tape) to achieve, rather than by sealing threaded cylindrical tube (G) sealing effect is through the use of sealing equipment at both ends of the threaded connection or around (such as: O type sealing ring) to achieve. Not only that, general sealing pipe thread threaded and non sealing use and design tolerances for pipe threads are different, specific can see "metric, American and English standard thread standard manual". There's no such thing as a Baidu.
In fact, the main reason of many mechanical processing enterprises usually encounter thread ring gauge test all qualified but is sealed bad situation in the process of BSP lies in the confusion of the thread seal with Rp internal threads and non sealed with G internal threads.
Thread codes and standards relating to BSP threads:
G - inch pipe thread (standard: BS 2779, BS EN ISO 228-1, ISO 7-1)
BSPP - inch pipe thread (standard: BS 2779, BS EN ISO 228-1, ISO 7-1)
BSPT - Inch taper pipe threads (standard: BS 21, BS EN 10226-1, ISO 7-1)
R (Rp, Rs, Rc, R1, R2) - Inch taper pipe threads (standard: BS 21, BS EN 10226-1, ISO 7-1, DIN 2999)
Need more detailed information? Recommendations concern the public number after reply BSP free download.
For a more intuitive representation of the classification and the relationship between the BSP thread, but also to facilitate access, Xiao Bian specially made a BSP thread classification diagram (as follows). It is easy to see the difference and connection between BSP thread and G thread.
