Fire Hose Thread Adapter ID Reference

Adapter Guide_0001

 

Commonly Used U.S. Fire Hose Adapter Threads

Size (inch) NST/NH Outside Diameter Male (in) NST/NH Outside Diameter Male (Decimals) TPI NPSH Outside Diameter Male (in) NPSH Outside Diameter Male (Decimals) NPT Outside Diameter Male (in) NPT Outside Diameter Male (Decimals) TPI
3/4 –   –  – 1 1.03 1 .98 14
1 1 3/8 1.37 8 1 184 1.29 1 1/4 1.23 11 1/2
1 1/2 2 1.99 9 1 7/8 1.87 1 7/8 1.87 11 1/2
2 2 1/2 2.51 8 2 23/8 2.35 2 5/16 2.29 11 1/2
2 1/2 3 1/16 3.06 7 1/2 2 13/16 2.84 2 3/4 2.76 8
3 3 5/8 3.62 6 3 14/2 3.47 3 3/8 3.38 8
3 1/2 4 1/2 4.24 6 4 3.97 3 7/8 3.88 8
4 5 5.01 4 4 1/2 4.47 4 3/8 4.38 8
4 1/2 5 3/4 5.76 4 5 4.97 8
5 6 1/4 6.26 4 5 9/16 5.56 5 7/16 5.44 8
6 7 7.02 4 6 5/8 6.62 6 1/2 6.50 8

 

Commonly Used U.S. Fire Adapter Circumference

Size (inch) NST/NH Circumference (in) NPSH Circumference (in) NPT Circumference (in)
3/4 –  3 1/4 3 1/8
1 4 5/16 4 1/16 3 7/8
1 1/2 6 1/4 5 7/8 5 3/4
2 7 7/8 7 3/8 7 1/4
2 1/2 9 5/8 8 15/16 8 11/16
3 11 3/8 10 7/8 10 5/8
3 1/2 13 5/16 12 1/2 12 1/4
4 15 3/4 14 1/32 13 3/4
4 1/2 18 1/8 15 19/32
5 19 21/32 17 21/32 17 1/8
6 22 1/16 20 13/16 20 1/2

 

 Other U.S. Standard 2 1/2″ Adapter Threads

City Outside Diameter Male (in) Outside Diameter (decimals) TPI
British Pipe BSP 2 31/32 2.96 11
New York Corp NYC 3 3.00 8
New York City FD FDNY 3 1/32 3.03 8
Pacific Coast PCT 3 1/32 3.03 7 1/2
Chicago Hose 3 3/64 3.04 7
Chicago Fire Dept CFD 3 3.00 7 1/2
Buffalo, NY 3 1/16 3.06 8
Cincinnati, OH (new) 3 1/16 3.06 6
Cleveland, OH 3 5/64 3.07 8
Denver, CO 3 3/32 3.09 8
Detroit, MI 3 1/8 3.12 7 1/2
Omaha, NE 3 5/64 3.07 8
Phoenix, AZ (old) 3 1/16 3.06 6
Pittsburg, PA 3 1/16 3.06 6
Salt Lake City, UT 3 1/4 3.25 6
Toledo, OH 3 3.00 8

 

Canadian Standard 2 1/2″ Adapter Threads

    Outside Diameter Male (in) Outside Diameter (decimals) TPI
AMA Alberta Mutual Aid 3 2.99 8
BCT British Columbia 3 3.00 8
CSA Canadian Standards Assoc. 3 1/8 3.12 5
QST Province of Quebec Std. 3 1/32 3.03 7
WCT Western Canada Fire Under 3 1/4 3.25 6
NOVA Nova Scotia -Zone 1 3 15/64 3.23 5
QMT Quebec/Montreal Combination 3 1/32 3.03 7

 

Garden Hose Adapter Connection

Size (in) Outside Diameter (in) Outside Diameter (decimals) TPI Circumference in Inches
3/4 1 1/16 1.06 11 1/2 3 11/16

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