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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T If the thread is tapered: The globe seal nose may contain an O-ring. Threaded connections are often referred to as a process connection type.

Thread and End Connection | CYRIL LE CORSU –

For each case, read across the table to the pitch column to determine the possible thread pitches for your thread. Nominal thread diameter kis 0. Even experienced workers sometimes have difficulty identifying threads, regardless of their thread identification procedure and the quality of their gauges. Remember me on this computer.

These connections allow products to be installed directly into piping or with the use of threaded fittings. It is intended to be used as a guide to help identify various threads.

Therefore, thread standards can be used to help define end connection standards. Thread standards are usually referenced in the end connection standard.

A gland with a flat face is held against the body by a female nut that threads onto the body. Log In Sign Up. B02033 diameter measurement obtained in this step may not be exactly the same as the listed nominal size for the given thread. Pitch For the purposes of this guide, pitch refers to threads per inch, instead of the distance between the threads, for fractional screw threads and ji threads.


Study the cross-section drawings for these end connections and determine which one matches your end connection. Click here to sign up. Male Thread OD 4. Contact your independent Swagelok representative for additional information.

The seal takes place by compressing the O-ring between the faces of the fitting. Tapered threads tighten to create a higher pressure fluid type seal.

Tapered ISO Jos 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 iis.

The male end has a straight thread and an O-ring in a groove on the face of the fitting. Once you have determined the following about a thread, you have all the information required to identify it: See pages 20 through The female has a straight thread and a counterbore in the ID of the fitting to accept a gasket.

The female end has a straight thread and a flat, smooth surface. The seal takes place by compressing the O-ring into the taper. Measure the thread diameter.

JIS B 0203: Taper pipe threads

S Measure any full thread. Calibration of calipers is the responsibility of the end user. The seal takes place by compressing a gasket between the male and female fittings.

If not, jia another gauge. The male end has a straight thread and a straight shoulder. A sealant is not required or recommended on straight threads. Enter the email address you signed up with and we’ll email you a reset link. The female end has a straight thread. The information in this chart is not intended to be used as inspection criteria for threaded fittings.


In this case, they are 20 and This gasket could be either all metal or metal with a bonded elastomer on the ID. Select one of the gauges and place its angle against the seat angle of the end connection. S If all the diameters are the same, the thread is Last 4th 1st Figure 1. The complete catalog contents must be reviewed to ensure that the system designer and user make a safe product selection.

Pipe Gauge for Precision Inspection of Tapered Male Pipe Thread (JIS B) | ASADA | MISUMI USA

We will use the following definitions in this manual: Use jsi caliper to measure the nominal male or female thread diameter from crest-to-crest. If the two pieces of metal are forced against each other without lubrication, galling is possible.

Because the threads of the mating fittings are parallel to each other, there is no interference between the flanks, crests, and roots. See Unified Screw Threads.

U.S. and International Threaded Connection Standards

Depending on the application and materials, thread lubricant may be used. The female end is a nut with a straight thread captured on a globe seal nose gland. On the appropriate thread identification reference table, locate the nominal thread diameter. At this point you know that jiis thread has the following characteristics: There is no standard for torque or number of turns.