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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Measuring the Thread Diameters straight parallel. If the two pieces of metal are forced against each other without lubrication, galling is possible.

The globe seal nose may contain an O-ring. The male end has a straight thread and an O-ring in a groove on the face of the fitting. Depending on the application and materials, thread lubricant may be used. If the centerline of the fitting and the longitudinal axis of the gauge are parallel, the seat angle and the gauge angle are the same.

For each case, read across the table to the pitch column to determine the possible thread pitches for your thread. Measured thread diameters may not match table measurements exactly. Use of a metal gasket is suggested. Pitch Gauge A pitch gauge is used to identify the thread pitch. In this case, they are 20 and The female end has a straight thread. See pages 20 through Enter the email address you signed up with and we’ll email you a reset link.

Thread and End Connection.


U.S. and International Threaded Connection Standards – Dwyer Instruments Blog

The male end has a straight thread and an O-ring. The seal takes place by compressing a gasket between the angled shoulder and the flat, smooth surface.

Skip to main content. 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 pipe threads. If not, try another gauge. Since the thread is straight, turn to the Straight Thread Identification Reference Table on page 14, and locate the thread diameter.

Straight or parallel threads are best used as fastening connections since they do not have a leak tight seal. Measure the thread diameter. Locate the end connections that have the tapered thread you identified. Selected special combinations of diameters, pitches, and lengths of engagement.

Pipe Gauge for Precision Inspection of Tapered Male Pipe Thread (JIS B0203)

The male end has an undersized NPT thread and an O-ring groove on the shoulder of the hex. Try the appropriate pitch 0b203 form for the threads identified in Step b. Note that it is common to have the thread diameter for different threads listed multiple times.

Tapered threads tighten to create a higher pressure fluid type seal. There is no standard for torque or number of turns. Study the cross-section drawings for these end connections and determine which one matches your end connection. You find that the thread is straight. Calibration of calipers is the responsibility of the end user. The female end is a nut with a straight thread captured on a globe seal nose gland.


The female end has a straight thread and a taper to accept the O-ring. The seal takes place by compressing the O-ring into the taper. Determine if the thread is tapered or straight parallel. Note that a pitch gauge may be Unified threads per inchWhitworth threads per inchor metric millimeters per thread as marked on the back of each gauge form.

Therefore, thread standards can be used to help define end connection standards. Help Center Find new research papers in: See cut-out of table below. S If all the diameters are the same, the thread is Last 4th 1st Figure 1. At this point you know that the thread has the following characteristics: These connections allow products to be installed directly into piping or with the use of threaded fittings.

U.S. and International Threaded Connection Standards

The flanks compress against one another due to the thread taper as the fittings are attached. The male fitting has a straight thread and a spigot which fits through the ID of the gasket. Look across the table to find the correspon- ding pitches. Thread standards are usually referenced in the end connection standard. T If the diameters increase for a male end n0203 decrease for a female end, the thread is tapered.