Name of Legally Binding Document: JIS B Taper pipe threads. Name of Standards Organization: Japan Standards Association (JSA). UDC JIS. Japanese Industrial Standard. Designation of thread . r = P. P = n. JIS B ISO (BS21). C JIS B – Download as PDF File .pdf), Text File .txt) or read online. JIS B .

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Look across the table to find the correspon- ding pitches. The flanks compress against one another due to the thread taper as the fittings are attached. Even experienced workers sometimes have difficulty identifying threads, regardless of their thread identification procedure and the quality of their gauges. The seal takes place between the male taper and the ID of the tapered gland or flared tubing.

Jia If the thread is tapered: Tapered ISO Thread Gages Though ISO and NPT threads can look similar, they can never be used together, as they have different taper angles, root and crest, threads per inch, and pitch, which would result in non-sealing fittings.

Maryland Metrics: Common types of pipe threads used in the piping industry

If you prefer to narrow down the choices, use the following procedure: Help Center Find new research papers in: Positive identification may not be possible without the use of an optical comparator.


Consequently, the seal must be made with a gasket, O-ring, or some metal-to-metal contact.

See pages 26 through Identify the end connection. Skip to iis content. Threaded Connections Threaded connections are often referred to as a process connection type.

JIS B 0203: Taper pipe threads

A sealant is not required or recommended on straight threads. The main reason for this variation is industry or manufacturing g0203. If the two pieces of metal are forced against each other without lubrication, galling is possible.

On the appropriate thread identification reference table, locate the nominal thread diameter. There is no standard for torque or number of turns. Select one of the gauges and place its angle against the seat angle of the end connection. The seal takes place between the taper in the male fitting and the globe seal nose.

The male end has a straight thread and an angled shoulder. Determine if the thread is T tapered or S straight parallel. Because the threads of the mating fittings are parallel to each jus, there is no interference between the flanks, crests, and roots.

The male end has a straight thread and an O-ring.


Note that it is common to have the kis diameter for different threads listed multiple times. The female end has a straight thread and a flat, smooth surface. The seal takes place by compressing a gasket between the angled shoulder and the flat, smooth surface.

The information in this chart is not intended to be used as inspection criteria for threaded fittings. Each end connection, however, will generally have threads that are one of the three most common: Your email address will not be published.

Locate the end connections that have the tapered thread you v0203. Identify the type of seal. The diameter measurement obtained in this step may not be exactly the same as the listed nominal size for the given thread. In this case, they are 20 and The male end has a straight thread and a straight shoulder.

The female end has a straight thread and a smooth, flat surface. Since the thread is straight, turn to the Straight Thread Identification Reference Table on page 14, and locate the thread diameter.