Hose Coupling Screw Threads Machinery's Handbook, 31st Edition
2101
Hose Coupling Screw Threads ANSI/ASME Standard Hose Coupling Screw Threads.— Threads for hose couplings, valves, and all other fittings used in direct connection with hose intended for domestic, industrial, and general service in sizes 1 ∕ 2 , 5 ∕ 8 , 3 ∕ 4 , 1, 1 1 ∕ 4 , 1 1 ∕ 2 , 2, 2 1 ∕ 2 , 3, 3 1 ∕ 2 , and 4 inches are covered by ANSI/ASME B1.20.7-1991 (R2018). These threads are designated as follows: 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. Thread dimensions are given in Table 1 and thread lengths in Table 2.
p
Internal Thread (Coupling Swivel)
p 24
h 18
h 6
f
p
8
h
1 2
h 2
allowance (external thread only)
60°
30°
p
8
h 18
p 24
External Thread (Nipple)
90°
p =Pitch h = Basic Thread Height =0.649519 p f = Basic Truncation
1 6
h = 0.108253 p
=
Axis of Screw Thread
Fig. 1. Thread Form for ANSI Standard Hose Coupling Threads, NPSH, NH, and NHR. Heavy Line Shows Basic Size.
Copyright 2020, Industrial Press, Inc.
ebooks.industrialpress.com
Made with FlippingBook - Share PDF online