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Table 1. ANSI Standard Hose Coupling Threads for NPSH, NH, and NHR Nipples and Coupling Swivels ANSI/ASME B1.20.7-1991

更新时间: 2013-9-29
Table 1. ANSI Standard Hose Coupling Threads for NPSH, NH, and NHR Nipples and Coupling Swivels ANSI/ASME B1.20.7-1991
All dimensions are given in inches.
Dimensions given for the maximum minor diameter of the nipple are figured to the intersection of the worn tool arc with a centerline through crest and root. The
minimum minor diameter of the nipple shall be that corresponding to a flat at the minor diameter of the minimum nipple equal to 1⁄24p, and may be determined by subtracting
0.7939p from the minimum pitch diameter of the nipple. (See Fig. 1.)
Dimensions given for the minimum major diameter of the coupling correspond to the basic flat, 1⁄8p, and the profile at the major diameter produced by a worn tool must
not fall below the basic outline. The maximum major diameter of the coupling shall be that corresponding to a flat at the major diameter of the maximum coupling equal
to 1⁄24p and may be determined by adding 0.7939p to the maximum pitch diameter of the coupling. (See Fig. 1.)
NH and NHR threads are used for garden hose applications. NPSH threads are used for steam, air and all other hose connections to be made up with standard pipe
threads. NH (SPL) threads are used for marine applications.
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