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 TB 55-1900-201-45/1
Table D-11
NATIONAL STD. FIRE-HOSE COUPLING SCREW THREAD
Nominal inside diameter of hose coupling (C) ................................................
2 1/2
3
3 1/2
4 1/2
Number of threads per inch ...........................................................................
7 1/2
6
6
4
Total length of threaded part of coupling and
hydrant nipple, external thread (see L, fig. 1).................................................
1
1 1/8
1 1/8
1 1/4
Distance from face of nipple to start of second
turn (see I, fig. 1)...........................................................................................
5/16
5/16
7/16
Depth of coupling swivel to washer seat (see
H, fig. 1) ........................................................................................................
15/16
1 1/16
1 1/16
13/16
Distance from face of coupling swivel to start of
second turn (see J, fig. 1) ..............................................................................
3/16
1/4
1/4
3/8
Depth of thread of coupling swivel (see T, fig. 1).. .........................................
11/16
13/16
13/16
13/16
Nipple (external thread) cylindrical to base of
thread ...........................................................................................................
Coupling (internal thread) cylindrical to base
of thread. .......................................................................................................
Outer ends of external and internal thread should
be terminated by the "Higbee Cut" on FULL THREAD
to avoid crossing and mutilation of thread (see
figs. 1, 2 & 3 of A.S.A. B26) .........................................................................
American (National) Form of thread must be used .........................................
All dimensions given in inches.
Figure 1. Typical Form of Standard Coupling.
D-14
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