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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The globe seal nose may contain an O-ring.

Identify the jus connection. The counterbore is larger to help ensure the male end compresses the gasket jiss a sealing position. There is no standard for torque or number of turns. 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.

The seal takes place between the taper in the male fitting and the globe seal nose. A gland with a flat face is held against the body by a female nut that threads onto the body.

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

The main reason for this variation is industry or manufacturing tolerances. If the two pieces of js are forced against each other without lubrication, galling is possible.

The male end has a straight thread and an O-ring in a groove on the face of the fitting. Pitch Gauge A pitch gauge is used to identify the thread pitch. The seal takes place between the male taper and the ID of the tapered gland or flared tubing. Nominal thread diameter of 0. You find the thread diameter to be 0. Use a caliper to measure the nominal male or female thread crest-to-crest diameter on the first, fourth, and last full threads.


These connections allow products to be installed directly into piping or with the use of threaded fittings. Determine the thread standard. For all metric screw threads, pitch refers to the distance between adjacent threads. Each end connection, however, will generally have threads that are one of the three most common: ISOis the international standard for parallel threads. For each case, read across the table to the pitch column to determine the possible thread pitches for your thread.

Locate the end connections that use the straight thread you identified.

Measuring the Thread Diameters straight parallel. Tapered threads tighten to create a higher pressure fluid type seal. Log In Sign Up. For threaded connections there are two common types, 1. b02033

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. Identify the type of seal. Straight Thread Connection Tapered threads tighten to create a higher pressure fluid type seal. 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.

The female end has a straight thread. The male end has a straight thread and an O-ring. Therefore, thread standards can be used to help define end connection standards. In this case, they are 20 and Measure the thread diameter. 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 seal takes place by compressing the O-ring between the faces of the fitting.

It is intended to be used as a guide to help identify various threads. Help Center Find new research papers in: If you prefer to narrow down the choices, use the following procedure: The complete catalog contents must be reviewed to ensure that the system designer and user make a safe product selection.

Thread and End Connection | CYRIL LE CORSU –

Study the cross-section drawings for these end connections and determine which one matches your end connection. The male end has a straight thread and an angled shoulder. Contact your Swagelok representative for additional information. The male end has an undersized NPT thread and an O-ring groove on the shoulder of the hex.

Function, material compatibility, adequate ratings, proper installation, operation, and maintenance are the responsibilities of the system designer and user. Your email address will not be published. Use a caliper to measure the nominal male or female thread diameter from crest-to-crest.