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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Skip to main content. Iis In Sign Up. Thread and End Connection. We will use the following definitions in this manual: Thread standards are usually referenced in the end connection standard. Therefore, thread standards can be used to help define end connection standards. 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.
For all metric screw threads, pitch refers to the distance between adjacent threads. Thread Flank Angle 2. Male Thread OD 4. Body Size 2 2. Determine if the thread is tapered or straight parallel. Measure the thread diameter.
U.S. and International Threaded Connection Standards – Dwyer Instruments Blog
Determine the thread pitch. Determine the thread standard. Identify the end connection. Even experienced workers sometimes have difficulty identifying threads, regardless of their thread identification procedure and the quality of their gauges. Determine if the thread is T tapered or S straight parallel. Use a caliper to measure the nominal male or female thread crest-to-crest diameter on the first, fourth, and last n0203 threads. T If the diameters increase for a male end or decrease for jks female end, the thread is tapered.
S If all the diameters are the same, the thread is Last 4th 1st Figure 1. Measuring the Thread Diameters straight parallel. Use a caliper to measure the nominal male or female thread diameter from crest-to-crest. T Jiss the fourth or fifth full thread. S Measure any full thread. The diameter measurement obtained in this step may not be exactly the same as the listed nominal size for the given thread.
The main reason for this variation is industry or manufacturing tolerances. To determine the thread pitch, his the Swagelok pitch gauges and check the thread against each form until you find a match. If you prefer to narrow down the choices, use the following procedure: On the appropriate thread identification reference table, locate the nominal thread diameter.
Note that it is common to have the thread diameter for different threads listed multiple times. For each case, read across the table to the pitch column to determine the possible thread pitches for your thread.
U.S. and International Threaded Connection Standards
Try the appropriate pitch gauge form for the threads identified in Step b. Once you have determined the following about a thread, you have all the information required to identify it: T If the thread is tapered: Locate the end connections that have the tapered thread you identified.
See pages b023 through Study the cross-section drawings for these end connections and determine which one matches your end connection. Locate the end connections that use the straight thread you identified. See pages 26 through Select one of the gauges and place its angle against the seat angle of the end connection. 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.
If not, try another gauge. Contact your independent Swagelok representative for additional information. Thread and End Connection Identification Steps You have a male fitting and you need to identify its thread. You find that the thread is straight.
You find the thread diameter bb0203 be 0. Since the thread is straight, turn to the Straight Thread Identification Reference Table on page 14, and locate the thread diameter. See cut-out of table below. Look across the table to find the correspon- ding pitches. In this case, they are 20 and Therefore, to determine the pitch of the thread you would use your 20 and 24 pitch gauges. At this point you know that the thread has the following characteristics: Nominal thread diameter of 0.
To identify the end connection, you: Identify the type of seal. Measured thread diameters may not match table mis exactly. All threads have tolerances regarding many parts of the threads. The information in this chart is not intended to be used as inspection jls for threaded fittings.
It is intended to be used as a guide to help identify various threads. Positive identification may not be possible without the use of an optical comparator. If jiis two pieces of metal are forced against each other without lubrication, galling is possible. There is no standard for torque or number of turns. Contact your Swagelok representative for additional information. The seal is designed to take place on b020 tapered thread. The male end has an undersized NPT thread and an O-ring groove on the shoulder of the hex.
The female end has an NPT thread and a smooth, flat surface.
The seal b0230 place by compressing the O-ring against the face of the female component. Each end connection, however, will generally have threads that are one of the three most common: Because the b203 of the mating fittings are parallel to each other, there is no interference between the flanks, crests, and b0023.
Consequently, the seal must be made with a gasket, O-ring, or some metal-to-metal contact. A sealant is not required or recommended on straight threads. Depending on the application and materials, thread lubricant may be used. Selected special combinations of diameters, pitches, and lengths of engagement. The seal takes place between the male taper and the ID of the b003 gland or flared tubing.
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. The female end has a straight thread and a smooth, flat surface. The male end has a straight thread and an O-ring in a groove on the face of the fitting.
The female end has a straight thread. A gland with a flat face is held against the body by a female nut that threads onto the body. The jia takes place by compressing the O-ring between the faces of the fitting. The seal takes place between the taper in the male fitting and flared tubing or directly on the inverted flare seat. The male fitting has a straight thread and a spigot which fits through the ID of the gasket. The female has a straight thread and a counterbore in the ID of the fitting to accept a gasket.
The counterbore is larger jsi help ensure the male end compresses the gasket into a sealing position. The seal takes place by compressing b00203 gasket between the male and female fittings. The male end has a straight thread and a straight shoulder. The female end has a straight thread and a flat, smooth surface. This gasket could be either all metal or metal with a bonded elastomer on the ID.
The male end has a straight thread and an angled jsi. The seal takes place by compressing a gasket between the angled shoulder and the flat, smooth surface.
Use of a metal gasket is suggested. The male end has a straight thread and an O-ring. The female end is a nut with a straight thread captured on a globe seal nose gland. The globe seal nose may contain an O-ring. The seal takes place between the taper in the male fitting and the globe seal nose. Calibration of calipers is jos responsibility of the end user. Pitch Gauge A pitch gauge is used to identify the thread pitch.