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 seal takes place by compressing a gasket between the male and female fittings. Measure the thread diameter. The female end has a straight thread and a taper to accept the O-ring. Ji complete catalog contents must be reviewed to ensure that the system designer and user make a safe product selection. Measured thread diameters may not match table measurements exactly.

The female end has a straight thread and a flat, smooth surface. Once you have determined b203 following about a thread, you have all the information required to identify it: Determine if the thread is T tapered or S straight parallel. The seal takes place between the male taper and the ID of the tapered gland or flared tubing.


The seal is designed to take place b02203 the tapered thread. At this point you know that the thread has the following characteristics: Threaded connections are jls referred to as a process connection type.

See pages 20 through The seal takes place between the taper in the male fitting and the globe seal nose. Therefore, thread standards can be used to help define end connection standards. Determine the thread standard. This gasket could be either all metal or metal with a bonded elastomer on the ID.

All threads have tolerances regarding many parts of the threads. S If all the diameters are the same, the thread is Last 4th 1st Figure 1. See Unified Screw Threads. See cut-out of table below.

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

A gland with a flat face is held against the body by a female nut that threads onto the body. You find the thread diameter to be 0. Note that it is common to have the thread diameter for different threads listed multiple times.


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

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

Skip to main content. Function, material compatibility, adequate ratings, proper installation, operation, and maintenance are the responsibilities of the system designer and user. Each end connection, however, will generally have threads that are one of the three most common: Try the appropriate pitch gauge form for the threads identified in Step b. Selected special combinations of diameters, pitches, and lengths of engagement. See pages 26 through If not, try another gauge.

Use of a metal gasket is suggested. The male fitting has a straight thread and a spigot which fits through the ID of the gasket. The male end has a straight thread and an O-ring. Log In Sign Up.