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AMERICAN PIPE THREADS

更新时间: 2013-9-26

AMERICAN PIPE THREADS

 

AMERICAN PIPE THREADS

All dimensions given in inches.

Increase in diameter per thread is equal to 0.0625/n.

The basic dimensions of the ANSI Standard Taper Pipe Thread are given in inches to four or five

decimal places. While this implies a greater degree of precision than is ordinarily attained, these

dimensions are the basis of gage dimensions and are so expressed for the purpose of eliminating

errors in computations.

Engagement Between External and Internal Taper Threads.—The normal length of

engagement between external and internal taper threads when screwed together handtight

is shown as L1 in Table 4. This length is controlled by the construction and use of the pipe

thread gages. It is recognized that in special applications, such as flanges for high-pressure

work, longer thread engagement is used, in which case the pitch diameter E1 (Table 4) is

maintained and the pitch diameter E0 at the end of the pipe is proportionately smaller.

Railing Joint Taper Pipe Threads, NPTR.—Railing joints require a rigid mechanical

thread joint with external and internal taper threads. The external thread is basically the

same as the ANSI Standard Taper Pipe Thread, except that sizes 1⁄2 through 2 inches are

shortened by 3 threads and sizes 21⁄2 through 4 inches are shortened by 4 threads to permit

the use of the larger end of the pipe thread. A recess in the fitting covers the last scratch or

imperfect threads on the pipe.

 

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