NH/NST Couplings | McMaster-Carr

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75 Products

About Fire-Fighting Hose Threads

How to Identify and Measure Fittings

Pipe size is an industry designation, not the actual size. View information about how to measure threaded and unthreaded pipe and pipe fittings.

Fire-Fighting Hose Fittings

Connect these fittings to fire hydrants and washdown equipment. Made of brass, they have good corrosion resistance. Some have a hex in the middle so you can tighten them with a wrench.

NH/NST (National Hose/National Standard) threads are only compatible with other NH/NST threads. Male NPSH (National Pipe Straight Hose) threads are compatible with female NPSH threads. Female NPSH threads are compatible with male NPSH, NPT, NPTF, and NPSM threads. BIT (British Instantaneous Thread) threads are commonly used in the United Kingdom, Ireland, India, Hong Kong, and parts of Canada. They’re also known as John Morris couplings.

For technical drawings and 3-D models, click on a part number.

Straight Adapters, NH/NST Male Threaded Hose × NPSH Male Threaded Hose

Fire Hose Trade Size	Pipe Size	Material		Each
1 1/2	1 1/2	Brass	0000000	000000

Straight Adapters, NH/NST Male Threaded Hose × NPSH Female Threaded Hose

Fire Hose Trade Size	Pipe Size	Material		Each
1 1/2	1 1/2	Brass	0000000	000000

Straight Adapter, NH/NST Male Threaded Hose x BIT Male Threaded Hose

Fire Hose Trade Size	Pipe Size	Material		Each
2 1/2	2 1/2	Brass	0000000	0000000

Straight Adapters, NH/NST Male Threaded Hose × NPT Male Threaded Pipe

Fire Hose Trade Size	Pipe Size	Material		Each
3/4	3/4	Brass	0000000	000000
1	1	Brass	0000000	00000
1 1/2	1 1/2	Brass	0000000	00000
2 1/2	2 1/2	Brass	0000000	00000
3	3	Brass	0000000	000000

Straight Adapters, NH/NST Male Threaded Hose × NPT Female Threaded Pipe

Fire Hose Trade Size	Pipe Size	Material		Each
1	1	Brass	00000000	000000
1 1/2	1 1/2	Brass	0000000	00000
2 1/2	2 1/2	Brass	0000000	00000

Straight Adapters, NPSH Male Threaded Hose × NH/NST Female Threaded Hose

Pipe Size	Fire Hose Trade Size	Material		Each
1 1/2	1 1/2	Brass	0000000	000000

Straight Adapter, BIT Male Threaded Hose x NH/NST Female Threaded Hose

Pipe Size	Fire Hose Trade Size	Material		Each
2 1/2	2 1/2	Brass	0000000	0000000

Straight Adapters, NPT Male Threaded Pipe × NH/NST Female Threaded Hose

Pipe Size	Fire Hose Trade Size	Material		Each
1	1	Brass	00000000	000000
1 1/2	1 1/2	Brass	0000000	00000
2 1/2	2 1/2	Brass	0000000	00000
3	3	Brass	0000000	000000

Straight Connectors, NH/NST Male Threaded Hose

Fire Hose Trade Size	Material		Each
1 1/2	Brass	0000000	000000
2 1/2	Brass	0000000	00000

Straight Reducers, NH/NST Male Threaded Hose

Fire Hose Trade Size
(A)	(B)	Material		Each
2 1/2	1 1/2	Brass	0000000	0000000

Straight Reducing Adapters, NH/NST Male Threaded Hose × NPT Male Threaded Pipe

Fire Hose Trade Size (A)	Pipe Size (B)	Material		Each
1 1/2	1	Brass	0000000	000000
1 1/2	2	Brass	0000000	00000
1 1/2	2 1/2	Brass	0000000	000000
2 1/2	1 1/2	Brass	0000000	000000
2 1/2	2	Brass	0000000	00000
2 1/2	3	Brass	0000000	000000

Straight Reducing Adapters, NH/NST Male Threaded Hose × NH/NST Female Threaded Hose

Fire Hose Trade Size
(A)	(B)	Material		Each
1 1/2	2 1/2	Brass	0000000	000000

Straight Reducing Adapters, NH/NST Male Threaded Hose × NPT Female Threaded Pipe

Fire Hose Trade Size (A)	Pipe Size (B)	Material		Each
1 1/2	1	Brass	0000000	000000
1 1/2	2	Brass	00000000	00000
2 1/2	1 1/2	Brass	0000000	00000
2 1/2	2	Brass	0000000	00000

Straight Reducing Adapters, NPT Male Threaded Pipe × NH/NST Female Threaded Hose

Pipe Size (A)	Fire Hose Trade Size (B)	Material		Each
1 1/2	3/4	Brass	0000000	000000
1 1/2	2 1/2	Brass	0000000	000000

Pin-Lug Fire-Fighting Hose Fittings

The pin lugs on these fittings allow for easy gripping, so you can quickly connect to fire hydrants and washdown equipment. Tighten with a hook-style spanner wrench (sold separately). All are brass for good corrosion resistance.

Fittings that swivel until tightened rotate to help prevent kinking during installation.

NH/NST (National Hose/National Standard) threads are only compatible with other NH/NST threads.

For technical drawings and 3-D models, click on a part number.

Straight Adapters, NH/NST Male Threaded Hose × NPT Female Threaded Pipe

Fire Hose Trade Size	Pipe Size	Material		Each
1 1/2	1 1/2	Brass	0000000	000000

Straight Adapters, NH/NST Male Threaded Hose × NPSH Female Threaded Pipe

Fire Hose Trade Size	Pipe Size	Material		Each
1 1/2	1 1/2	Brass	0000000	000000

Straight Adapters (Swivels Until Tightened), NH/NST Female Threaded Hose × NPT Female Threaded Pipe

Fire Hose Trade Size	Pipe Size	Material		Each
1 1/2	1 1/2	Brass	0000000	000000
2 1/2	2 1/2	Brass	0000000	000000

Straight Adapters (Swivels Until Tightened), NPT Male Threaded Pipe × NH/NST Female Threaded Hose

Pipe Size	Fire Hose Trade Size	Material		Each
1 1/2	1 1/2	Brass	0000000	000000
2 1/2	2 1/2	Brass	0000000	000000

Straight Adapters, NPSH Male Threaded Pipe × NH/NST Female Threaded Hose

Pipe Size	Fire Hose Trade Size	Material		Each
1 1/2	1 1/2	Brass	0000000	000000

Straight Connectors (Swivels Until Tightened), NH/NST Female Threaded Hose

Fire Hose Trade Size	Material		Each
1 1/2	Brass	0000000	0000000
2 1/2	Brass	0000000	000000

Straight Reducing Adapters, NH/NST Male Threaded Hose × NH/NST Female Threaded Hose

Fire Hose Trade Size
(A)	(B)	Material		Each
1	1 1/2	Brass	0000000	000000
1 1/2	2 1/2	Brass	0000000	00000

Straight Reducing Adapters, GHT Male Threaded Hose × NH/NST Female Threaded Hose

Garden Hose Trade Size (A)	Fire Hose Trade Size (B)	Material		Each
3/4	1 1/2	Brass	0000000	000000
3/4	2 1/2	Brass	0000000	00000

Straight Reducing Adapters (Swivels Until Tightened), NH/NST Female Threaded Hose × NPT Female Threaded Pipe

Fire Hose Trade Size (A)	Pipe Size (B)	Material		Each
2 1/2	2	Brass	0000000	0000000

Straight Reducing Adapters, NPT Male Threaded Pipe × NH/NST Female Threaded Hose

Pipe Size (A)	Fire Hose Trade Size (B)	Material		Each
3/4	2 1/2	Brass	0000000	000000
1	1 1/2	Brass	0000000	00000
1	2 1/2	Brass	0000000	00000
1 1/2	2 1/2	Brass	0000000	00000
2	2 1/2	Brass	0000000	00000

Straight Reducing Adapters (Swivels Until Tightened), NPT Male Threaded Pipe × NH/NST Female Threaded Hose

Pipe Size (A)	Fire Hose Trade Size (B)	Material		Each
2	2 1/2	Brass	0000000	0000000

Rocker-Lug Fire-Fighting Hose Fittings

The rocker lugs on these fittings allow for easy gripping, so you can quickly connect to fire hydrants and washdown equipment. Tighten with a hook-style spanner wrench (sold separately).

Fittings that swivel until tightened rotate to help prevent kinking during installation.

Aluminum fittings are more lightweight than brass fittings. They have good abrasion and corrosion resistance. Brass fittings are softer than aluminum fittings, so they’re easier to thread together. They have good corrosion resistance.

For technical drawings and 3-D models, click on a part number.

Straight Adapters, NH/NST Male Threaded Hose × NPT Male Threaded Hose

Aluminum
Fire Hose Trade Size	Pipe Size		Each
1 1/2	1 1/2	0000000	000000

Straight Adapters, NH/NST Male Threaded Hose × NPSH Female Threaded Hose

Brass
Fire Hose Trade Size	Pipe Size		Each
1 1/2	1 1/2	0000000	000000

Straight Adapters, NPT Male Threaded Pipe × NH/NST Female Threaded Hose

Brass
Pipe Size	Fire Hose Trade Size		Each
1 1/2	1 1/2	0000000	000000
2 1/2	2 1/2	0000000	00000

Straight Adapters (Swivels Until Tightened), NPT Female Threaded Hose × NH/NST Female Threaded Hose

Aluminum
Pipe Size	Fire Hose Trade Size		Each
2 1/2	2 1/2	0000000	0000000

Straight Connectors (Swivels Until Tightened), NH/NST Female Threaded Hose

Aluminum
Fire Hose Trade Size		Each
1 1/2	0000000	0000000

Straight Reducing Adapters, NH/NST Male Threaded Hose × NPT Male Threaded Hose

Fire Hose Trade Size
(A)	(B)		Each
Aluminum
2 1/2	2	0000000	000000

Straight Reducing Adapters, NH/NST Male Threaded Hose × NH/NST Female Threaded Hose

Fire Hose Trade Size
(A)	(B)		Each
Brass
1	1 1/2	0000000	000000
1	2 1/2	0000000	00000
1 1/2	2 1/2	0000000	00000
2 1/2	1 1/2	0000000	00000
Aluminum
1	1 1/2	0000000	00000
1 1/2	1	0000000	00000
1 1/2	2 1/2	0000000	00000
2 1/2	4 1/2	0000000	000000

Straight Reducing Adapters, NH/NST Male Threaded Hose × NPSH Female Threaded Hose

Brass
Fire Hose Trade Size (A)	Pipe Size (B)		Each
1 1/2	2 1/2	0000000	000000

Straight Reducing Adapters, NPT Male Threaded Hose × NH/NST Female Threaded Hose

Pipe Size
(A)	(B)		Each
Brass
1	1 1/2	0000000	000000
1	2 1/2	0000000	00000
2	2 1/2	0000000	00000
Aluminum
2	2 1/2	0000000	00000
4	4 1/2	0000000	000000

Straight Reducing Adapters, NPSH Male Threaded Hose × NH/NST Female Threaded Hose

Brass
Pipe Size (A)	Fire Hose Trade Size (B)		Each
1 1/2	2 1/2	0000000	000000