Hose Coupling Screw Threads Machinery's Handbook, 31st Edition
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Table 2. ANSI Standard Hose Coupling Screw Thread Lengths ANSI/ASME B1.20.7-1991 (R2018) L 60° 35° I
35°
T
C
H
Approx. O.D. of Ext. Thd.
Approx. No. Thds. in Length T
Nominal Size of Hose
Coupl. Thd. Length, T
Depth of Coupl., H
Length of Pilot, I
Length of Nipple, L
I.D. of Nipple, C
Threads per Inch
11.5 11.5
2 , 2 ,
8 , 8 ,
1 1 1 1 1 1 2 2 3 3 4
4 4 4 5 4 5 5 5 6 6 6 4
9 ∕ 9 ∕ 1 ∕ 9 ∕ 9 ∕ 5 ∕ 5 ∕ 3 ∕
1 ∕ 1 ∕ 1 ∕ 1 ∕
17 ∕ 17 ∕ 15 ∕ 17 ∕ 17 ∕ 19 ∕ 19 ∕ 23 ∕ 15 ∕
3 ∕ 3 ∕
1 ∕ 1 ∕
5 ∕ 5 ∕ 1 ∕ 3 ∕
3 ∕ 3 ∕
25 ∕ 25 ∕ 17 ∕ 25 ∕
1 ∕ 1 ∕
1 ∕ 1 ∕ 1 ∕ 1 ∕ 1 ∕ 1 ∕ 1 ∕ 3 ∕ 1 ∕ 1 ∕ 1 ∕ 1 ∕ 1 ∕
4 4
32 32
16 16
16 16
8 8 8 8
32 32 32 32 32 32 32 32
8 8
4 4 4 4 4 2 2 4 2 2 2 2 2
14 14
13 ∕
5 ∕
2 4
32
16
2
16
3 ∕ 3 ∕
1 ∕ 9 ∕ 5 ∕ 7 ∕
32
32 32
16 16
8 8
1
11.5 11.5 11.5 11.5
1 1 ∕
5 ∕ 5 ∕ 5 ∕ 3 ∕
32 32
32 32 32 16
1 1 ∕ 1 1 ∕
1 1
15 ∕ 15 ∕ 19 ∕ 11 ∕ 13 ∕ 13 ∕ 13 ∕
9 ∕
4 2
8 8
8 8 4
32 32 32 16 16 16 16
17 ∕
32
2
6
2 1 ∕
11 ∕ 27 ∕ 15 ∕ 31 ∕ 15 ∕
32
32 32 32 32 32 32
8 8 8 8 6
1 1 1 1 1
2 1 ∕
2
17 ∕
1 ∕ 1 ∕ 1 ∕ 1 ∕
2
32
4 4 4 4
16
3
1 1 1 1
3 1 ∕
1 ∕ 1 ∕ 1 ∕ 1 ∕
1 ∕ 1 ∕ 1 ∕ 1 ∕
32
8 8 8 8
16 16 16 16
3 1 ∕
3
17 ∕
2
32
4 4
4 1 ∕
32
4
4 29 ∕
5 ∕
3 ∕
16
4
All dimensions are given in inches. For thread designation see Table 1. American National Fire Hose Connection Screw Thread.— This thread is specified in the National Fire Protection Association’s Standard NFPA No. 194-1974. It covers the di- mensions for screw thread connections for fire hose couplings, suction hose couplings, relay supply hose couplings, fire pump suctions, discharge valves, fire hydrants, nozzles, adaptors, reducers, caps, plugs, wyes, siamese connections, standpipe connections, and sprinkler connections. Form of Thread: The basic form of thread is as shown in Fig. 1 . It has an included angle of 60 degrees and is truncated top and bottom. The flat at the root and crest of the basic thread form is equal to 1 ∕ 8 (0.125) times the pitch in inches. The height of the thread is equal to 0.649519 times the pitch. The outer ends of both external and internal threads are termi nated by the blunt start or “Higbee Cut” on full thread to avoid crossing and mutilation of thread. Thread Designation: The thread is designated by specifying in sequence the nominal size of the connection, number of threads per inch followed by the thread symbol NH.
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