NH/NST Reducers | McMaster-Carr

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Fire Hose Trade Size

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Maximum Pressure @ Temperature

300 psi @ 150° F

2 3/4"

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Swivels Until Tightened

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Maximum Temperature

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72 Products

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.

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

Image of Product. Front orientation. Fire Hose and Fittings. Fire-Fighting Hose Fittings , NPSH Thread, Adapter, Straight, Male, Threaded Fitting Connection, NH/NST Thread.

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.

Fire Hose Trade Size	Pipe Size	Material		Each
1 1/2	1 1/2	Brass	6523T51	000000

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

Image of Product. Front orientation. Fire Hose and Fittings. Fire-Fighting Hose Fittings , NPSH Thread, NH/NST Thread, Male, Adapter, Threaded Fitting Connection, Straight, Female.

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

Female NPSH threads are compatible with male NPSH, NPT, NPTF, and NPSM threads.

Fire Hose Trade Size	Pipe Size	Material		Each
1 1/2	1 1/2	Brass	6523T12	000000

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

Image of Product. Front orientation. Fire Hose and Fittings. Fire-Fighting Hose Fittings , NH/NST Thread, BIT Thread, Straight, Threaded Fitting Connection, Adapter, Male.

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

Fire Hose Trade Size	Pipe Size	Material		Each
2 1/2	2 1/2	Brass	6523T73	0000000

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

Image of Product. Front orientation. Fire Hose and Fittings. Fire-Fighting Hose Fittings , Straight, Adapter, NPT Thread, Threaded Fitting Connection, Male, NH/NST Thread.

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

Fire Hose Trade Size	Pipe Size	Material		Each
3/4	3/4	Brass	6523T61	000000
1	1	Brass	6523T17	00000
1 1/2	1 1/2	Brass	6523T11	00000
2 1/2	2 1/2	Brass	6523T14	00000
3	3	Brass	6523T57	000000

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

Image of Product. Front orientation. Fire Hose and Fittings. Fire-Fighting Hose Fittings , Male, Adapter, Straight, NPT Thread, NH/NST Thread, Threaded Fitting Connection, Female.

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

Fire Hose Trade Size	Pipe Size	Material		Each
1	1	Brass	6523T103	000000
1 1/2	1 1/2	Brass	6523T16	00000
2 1/2	2 1/2	Brass	6523T19	000000

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

Image of Product. Front orientation. Fire Hose and Fittings. Fire-Fighting Hose Fittings , NPSH Thread, Female, Adapter, Threaded Fitting Connection, Male, NH/NST Thread, Straight.

Male NPSH (National Pipe Straight Hose) threads are compatible with female NPSH threads.

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

Fire Hose Trade Size	Pipe Size	Material		Each
1 1/2	1 1/2	Brass	6523T25	000000

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

Image of Product. Front orientation. Fire Hose and Fittings. Fire-Fighting Hose Fittings , Adapter, Female, Straight, Male, Threaded Fitting Connection, BIT Thread, NH/NST Thread.

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.

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

Fire Hose Trade Size	Pipe Size	Material		Each
2 1/2	2 1/2	Brass	6523T71	0000000

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

Image of Product. Front orientation. Fire Hose and Fittings. Fire-Fighting Hose Fittings , Female, Male, NH/NST Thread, Adapter, NPT Thread, Straight, Threaded Fitting Connection.

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

Fire Hose Trade Size	Pipe Size	Material		Each
1	1	Brass	6523T102	000000
1 1/2	1 1/2	Brass	6523T52	00000
2 1/2	2 1/2	Brass	6523T55	000000
3	3	Brass	6523T58	000000

Straight Reducers, NH/NST Male Threaded Hose

Image of Product. Front orientation. Contains Annotated. Reducer Fitting. Fire-Fighting Hose Fittings .

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

Fire Hose Trade Size
(A)	(B)	Material		Each
2 1/2	1 1/2	Brass	6523T53	0000000

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

Image of Product. Front orientation. Contains Annotated. Fire Hose and Fittings. Fire-Fighting Hose Fittings , Reducing-Adapter Fitting, NH/NST Thread, Straight, Threaded Fitting Connection, Male, NPT Thread.

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

Fire Hose Trade Size (A)	Pipe Size (B)	Material		Each
1 1/2	1	Brass	6523T33	000000
1 1/2	2	Brass	6523T28	00000
1 1/2	2 1/2	Brass	6523T13	000000
2 1/2	1 1/2	Brass	6523T35	000000
2 1/2	2	Brass	6523T46	00000
2 1/2	3	Brass	6523T56	000000

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

Image of Product. Front orientation. Contains Annotated. Fire Hose and Fittings. Fire-Fighting Hose Fittings , NH/NST Thread, Female, Straight, Male, Threaded Fitting Connection, Reducing-Adapter Fitting.

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

Fire Hose Trade Size
(A)	(B)	Material		Each
1 1/2	2 1/2	Brass	6523T26	000000

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

Image of Product. Front orientation. Contains Annotated. Fire Hose and Fittings. Fire-Fighting Hose Fittings , NH/NST Thread, Straight, Reducing-Adapter Fitting, NPT Thread, Male, Female, Threaded Fitting Connection.

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

Fire Hose Trade Size (A)	Pipe Size (B)	Material		Each
1 1/2	1	Brass	6523T43	000000
1 1/2	2	Brass	6523T104	00000
2 1/2	1 1/2	Brass	6523T45	00000
2 1/2	2	Brass	6523T49	00000

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

Image of Product. Front orientation. Contains Annotated. Fire Hose and Fittings. Fire-Fighting Hose Fittings , NPT Thread, Straight, Female, Reducing-Adapter Fitting, NH/NST Thread, Threaded Fitting Connection, Male.

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

Fire Hose Trade Size (B)	Pipe Size (A)	Material		Each
3/4	1 1/2	Brass	6523T64	000000
2 1/2	1 1/2	Brass	6523T36	000000

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).

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

Image of Product. Back orientation. Fire Hose and Fittings. Rocker-Lug Fire-Fighting Hose Fittings , Straight, NPT Thread, Male, Threaded Fitting Connection, Adapter, NH/NST Thread.

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

Aluminum—Aluminum fittings are more lightweight than brass fittings. They have good abrasion and corrosion resistance.

	Pipe Size		Each
Aluminum



	1 1/2	1 1/2	6524T28	000000

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

Image of Product. Front orientation. Fire Hose and Fittings. Rocker-Lug Fire-Fighting Hose Fittings , Male, Straight, NPSH Thread, NH/NST Thread, Threaded Fitting Connection, Female, Adapter.

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

Female NPSH threads are compatible with male NPSH, NPT, NPTF, and NPSM threads.

Brass—Brass fittings are softer than aluminum fittings, so they’re easier to thread together. They have good corrosion resistance.

	Pipe Size		Each
Brass



	1 1/2	1 1/2	6524T17	000000

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

Image of Product. Front orientation. Fire Hose and Fittings. Rocker-Lug Fire-Fighting Hose Fittings , Male, NH/NST Thread, Female, Adapter, Threaded Fitting Connection, Straight, NPT Thread.

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

Brass—Brass fittings are softer than aluminum fittings, so they’re easier to thread together. They have good corrosion resistance.

	Pipe Size		Each
Brass



	1 1/2	1 1/2	6524T19	000000


	2 1/2	2 1/2	6524T27	00000

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

Image of Product. Front orientation. Fire Hose and Fittings. Rocker-Lug Fire-Fighting Hose Fittings , NH/NST Thread, NPT Thread, Straight, Adapter, Female, Threaded Fitting Connection.

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

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

Aluminum—Aluminum fittings are more lightweight than brass fittings. They have good abrasion and corrosion resistance.

	Pipe Size		Each
Aluminum



	2 1/2	2 1/2	6524T44	0000000

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

Image of Product. Front orientation. Fire Hose and Fittings. Rocker-Lug Fire-Fighting Hose Fittings , Female, Straight, Connector Fitting, NH/NST Thread, Threaded Fitting Connection.

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.

Aluminum—Aluminum fittings are more lightweight than brass fittings. They have good abrasion and corrosion resistance.

		Each
Aluminum



	1 1/2	6524T42	0000000

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

Image of Product. Front orientation. Contains Annotated. Fire Hose and Fittings. Rocker-Lug Fire-Fighting Hose Fittings , Straight, Threaded Fitting Connection, NPT Thread, Reducing-Adapter Fitting, NH/NST Thread, Male.

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

Aluminum—Aluminum fittings are more lightweight than brass fittings. They have good abrasion and corrosion resistance.

	Pipe Size (B)		Each
Aluminum



	2 1/2	2	6524T29	000000

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

Image of Product. Front orientation. Contains Annotated. Fire Hose and Fittings. Rocker-Lug Fire-Fighting Hose Fittings , Threaded Fitting Connection, Straight, NH/NST Thread, Reducing-Adapter Fitting, Female, Male.

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

Brass—Brass fittings are softer than aluminum fittings, so they’re easier to thread together. They have good corrosion resistance.

Aluminum—Aluminum fittings are more lightweight than brass fittings. They have good abrasion and corrosion resistance.

	Fire Hose Trade Size
	(A)	(B)		Each
Brass



		1	1 1/2	6524T15	000000


		1	2 1/2	6524T16	00000
		1 1/2	2 1/2	6524T22	00000
		2 1/2	1 1/2	6524T25	00000


		Aluminum



				1	1 1/2	6524T33	00000


				1 1/2	1	6524T32	00000
				1 1/2	2 1/2	6524T36	00000
				2 1/2	4 1/2	6524T38	000000

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

Image of Product. Front orientation. Contains Annotated. Fire Hose and Fittings. Rocker-Lug Fire-Fighting Hose Fittings , Straight, Reducing-Adapter Fitting, Male, NH/NST Thread, NPSH Thread, Female, Threaded Fitting Connection.

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

Female NPSH threads are compatible with male NPSH, NPT, NPTF, and NPSM threads.

Brass—Brass fittings are softer than aluminum fittings, so they’re easier to thread together. They have good corrosion resistance.

	Pipe Size (B)		Each
Brass



	1 1/2	2 1/2	6524T14	000000

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

Image of Product. Front orientation. Contains Annotated. Fire Hose and Fittings. Rocker-Lug Fire-Fighting Hose Fittings , NPT Thread, Straight, Reducing-Adapter Fitting, Male, Female, Threaded Fitting Connection, NH/NST Thread.

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

Brass—Brass fittings are softer than aluminum fittings, so they’re easier to thread together. They have good corrosion resistance.

	Pipe Size (A)		Each
Brass



	1 1/2	1	6524T13	000000


	2 1/2	1	6524T18	00000
	2 1/2	2	6524T26	00000

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

Image of Product. Front orientation. Contains Annotated. Fire Hose and Fittings. Rocker-Lug Fire-Fighting Hose Fittings , Male, Female, Threaded Fitting Connection, Straight, Reducing-Adapter Fitting, NPT Thread, NH/NST Thread.

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

Aluminum—Aluminum fittings are more lightweight than brass fittings. They have good abrasion and corrosion resistance.

	Pipe Size (A)		Each
Aluminum



	2 1/2	2	6524T37	000000


	4 1/2	4	6524T39	000000

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

Image of Product. Front orientation. Contains Annotated. Fire Hose and Fittings. Rocker-Lug Fire-Fighting Hose Fittings , Male, NH/NST Thread, Straight, NPSH Thread, Reducing-Adapter Fitting, Threaded Fitting Connection, Female.

Male NPSH (National Pipe Straight Hose) threads are compatible with female NPSH threads.

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

Brass—Brass fittings are softer than aluminum fittings, so they’re easier to thread together. They have good corrosion resistance.

	Pipe Size (A)		Each
Brass



	2 1/2	1 1/2	6524T24	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.

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

Image of Product. Front orientation. Contains Annotated. Fire Hose and Fittings. Pin-Lug Fire-Fighting Hose Fittings, Threaded Fitting Connection, Straight, NH/NST Thread, Reducing-Adapter Fitting, Female, Male.

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

Fire Hose Trade Size
(A)	(B)	Material		Each
1	1 1/2	Brass	6494T24	000000
1 1/2	2 1/2	Brass	6494T25	00000

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

Image of Product. Front orientation. Contains Annotated. Reducing-Adapter Fitting. Pin-Lug Fire-Fighting Hose Fittings, NPT Thread, Male, Female, NH/NST Thread.

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

Pipe Size (A)	Fire Hose Trade Size (B)	Material		Each
3/4	2 1/2	Brass	6494T28	000000
1	1 1/2	Brass	6494T14	00000
1	2 1/2	Brass	6494T15	00000
1 1/2	2 1/2	Brass	6494T26	00000
2	2 1/2	Brass	6494T27	00000

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

Image of Product. Front orientation. Fire Hose and Fittings. Pin-Lug Fire-Fighting Hose Fittings, Male, Straight, NH/NST Thread, Threaded Fitting Connection, Adapter, NPT Thread, Female.

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

Fire Hose Trade Size	Pipe Size	Material		Each
1 1/2	1 1/2	Brass	6494T12	000000

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

Image of Product. Front orientation. Fire Hose and Fittings. Pin-Lug Fire-Fighting Hose Fittings, NPSH Thread, Female, NH/NST Thread, Threaded Fitting Connection, Male, Straight, Adapter.

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

Fire Hose Trade Size	Pipe Size	Material		Each
1 1/2	1 1/2	Brass	6494T11	000000

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

Image of Product. Front orientation. Fire Hose and Fittings. Pin-Lug Fire-Fighting Hose Fittings, Adapter, NH/NST Thread, Straight, NPT Thread, Female, Threaded Fitting Connection.

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

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

Fire Hose Trade Size	Pipe Size	Material		Each
1 1/2	1 1/2	Brass	6494T64	000000
2 1/2	2 1/2	Brass	6494T73	000000

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

Image of Product. Front orientation. Fire Hose and Fittings. Pin-Lug Fire-Fighting Hose Fittings, NPT Thread, Female, Straight, NH/NST Thread, Adapter, Threaded Fitting Connection, Male.

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.

Fire Hose Trade Size	Pipe Size	Material		Each
1 1/2	1 1/2	Brass	6494T61	000000
2 1/2	2 1/2	Brass	6494T63	000000

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

Image of Product. Front orientation. Fire Hose and Fittings. Pin-Lug Fire-Fighting Hose Fittings, NPSH Thread, NH/NST Thread, Threaded Fitting Connection, Female, Adapter, Male, Straight.

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

Fire Hose Trade Size	Pipe Size	Material		Each
1 1/2	1 1/2	Brass	6494T13	000000

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

Image of Product. Front orientation. Contains Annotated. Fire Hose and Fittings. Pin-Lug Fire-Fighting Hose Fittings, Male, Reducing-Adapter Fitting, NH/NST Thread, GHT Thread, Threaded Fitting Connection, Straight, Female.

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

Garden Hose Trade Size (A)	Fire Hose Trade Size (B)	Material		Each
3/4	1 1/2	Brass	6494T22	000000
3/4	2 1/2	Brass	6494T23	00000

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

Image of Product. Front orientation. Contains Annotated. Fire Hose and Fittings. Pin-Lug Fire-Fighting Hose Fittings, Straight, NH/NST Thread, Reducing-Adapter Fitting, Threaded Fitting Connection, NPT Thread, Female.

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

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

Pipe Size (B)	Fire Hose Trade Size (A)	Material		Each
2	2 1/2	Brass	6494T66	0000000

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

Image of Product. Front orientation. Contains Annotated. Reducing-Adapter Fitting. Pin-Lug Fire-Fighting Hose Fittings, NH/NST Thread, Female, Male, Swivels Until Tightened, NPT Thread.

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.

Pipe Size (A)	Fire Hose Trade Size (B)	Material		Each
2	2 1/2	Brass	6494T72	0000000

Diverting Valves with Fire-Fighting Hose Fittings

Control the flow of water in two directions from a single source—these diverting valves have two balls and handles for independent operation of each outlet. They can direct flow to one side outlet at full capacity while shutting off flow to the second side outlet, direct flow to both side outlets at reduced capacity, or shut off flow to both side outlets. Valves have a brass body for good corrosion resistance. They are for use with fire-fighting hose.

NH/NST Female × NH/NST Male × NH/NST Male

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

Flow Coefficient (Cv)—Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.

	Outlet Fire Hose Trade Sizes	Diverting Valve Flow Pattern	Flow Coefficient (Cv)	Max. Pressure @ Temp.	Temp. Range, ° F	End-to-End Lg.	Valve Type	For Use With	Seal Material		Each
Brass Body



	2 1/2	1 1/2 × 1 1/2	Y-Pattern	Not Rated	300 psi @ 150° F	-20 to 150	5 5/8"	Ball	Water	Buna-N	6504T5	0000000