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Standard Hose Coupling Threads per. ANSI ASME B1.20.7

Standard Hose Coupling Screw Threads, per. ANSI ASME B1.20.7

Threads for hose couplings, valves, and all other fittings used with standard hoses for domestic, industrial, and general service sizes include:

1⁄/2, 5/⁄8, 3⁄/4, 1, 1-1/⁄4, 1-1/⁄2, 2, 2-1/⁄2, 3, 3-1/⁄2, and 4 inches

Terms

  • NH - Standard hose coupling threads of full form as produced by cutting or rolling.
  • NHR - Standard hose coupling threads for garden hose applications where the design utilizes thin walled material which is formed to the desired thread.
  • NPSH - Standard straight hose coupling thread series in sizes 1⁄2 to 4 inches for joining` to American National Standard taper pipe threads using a gasket to seal the joint.

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.

Standard Hose Threads per. ASME B1.20.7-1991 (R2013)

Figure 1, Standard Hose Coupling Threads per. ASME B1.20.7-1991 (R2013)

Source: ASME B1.20.7-1991 (R2013)

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