Iron Pipe Nipples | McMaster-Carr

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70 Products

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.

Thick-Wall Galvanized Iron and Steel Threaded Pipe Nipples and Pipe

Made of galvanized iron or steel, this pipe has fair corrosion resistance. It has thick, Schedule 80 walls for good strength in medium-pressure applications.

Seamless pipe has a smooth interior for unrestricted flow and is stronger than welded pipe.

Straight reducers are also known as swage nipples.

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

Reducers, Threaded on Both Ends

Reducer

For Use With: Air, Natural Gas, Nitrogen Gas, Oil, Steam, Water
Specifications Met: ASTM B633, ASTM A234, MSS SP-95, ASME B1.20.1
Fittings: Use Class 300 iron or steel
Flanges: Use Class 300 steel

Pipe Size
(A)	(B)	Lg.	Thread Type	Construction	Material		Each
3/4	1/8	3"	NPT	Seamless	Galvanized Iron	00000000	000000
2	1/4	6 1/2"	NPT	Seamless	Galvanized Iron	00000000	000000
2 1/2	3/4	7"	NPT	Seamless	Galvanized Iron	00000000	000000
2 1/2	1	7"	NPT	Seamless	Galvanized Iron	00000000	000000
2 1/2	1 1/4	7"	NPT	Seamless	Galvanized Iron	00000000	000000
2 1/2	1 1/2	7"	NPT	Seamless	Galvanized Iron	00000000	000000
2 1/2	2	7"	NPT	Seamless	Galvanized Iron	00000000	000000
3	1/2	8"	NPT	Seamless	Galvanized Iron	00000000	000000
3	3/4	8"	NPT	Seamless	Galvanized Iron	00000000	000000
3	1	8"	NPT	Seamless	Galvanized Iron	00000000	000000
3	1 1/4	8"	NPT	Seamless	Galvanized Iron	00000000	000000
3	1 1/2	8"	NPT	Seamless	Galvanized Iron	00000000	000000
3	2	8"	NPT	Seamless	Galvanized Iron	00000000	000000
3	2 1/2	8"	NPT	Seamless	Galvanized Iron	00000000	000000
4	1/2	9"	NPT	Seamless	Galvanized Iron	00000000	000000
4	3/4	9"	NPT	Seamless	Galvanized Iron	00000000	000000
4	1	9"	NPT	Seamless	Galvanized Iron	00000000	000000
4	1 1/4	9"	NPT	Seamless	Galvanized Iron	00000000	000000
4	1 1/2	9"	NPT	Seamless	Galvanized Iron	00000000	000000
4	2	9"	NPT	Seamless	Galvanized Iron	00000000	000000
4	2 1/2	9"	NPT	Seamless	Galvanized Iron	00000000	000000
4	3	9"	NPT	Seamless	Galvanized Iron	00000000	000000

Grooved-End Iron Pipe Fittings

The grooved ends on these fittings connect to pipe with a clamp to easily install piping systems. Since there’s no heat or threading required, they provide quick access to a pipe line for routine maintenance. Fittings are also known as Victaulic fittings. They are for use in noncorrosive applications.

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

Straight Reducing Adapters

For Use With: Air, Water
Temperature Range: -30° to 250° F
Specifications Met: UL Listed, ASTM A536, FM Approved

Pipe Size
(A)	(B)	Max. Pressure	Color	Material		Each
Grooved End × NPT Male
2	1	750 psi @ 72° F	Orange	Enamel-Coated Ductile Iron	00000000	000000
2	1 1/2	750 psi @ 72° F	Orange	Enamel-Coated Ductile Iron	00000000	00000
2 1/2	1 1/2	750 psi @ 72° F	Orange	Enamel-Coated Ductile Iron	00000000	000000
2 1/2	2	750 psi @ 72° F	Orange	Enamel-Coated Ductile Iron	00000000	00000

Twist-Claw Hose Couplings for Air and Water

Also known as Chicago and universal couplings, these have an identical claw-style head that allows you to connect to another Chicago twist-claw hose coupling, regardless of the pipe size or barbed hose ID. To connect, push two couplings together with a quarter twist. Couplings have a safety clip and lanyard to prevent accidental disconnection.

Iron couplings are stronger and more durable than other metal couplings. Use in noncorrosive environments. Warning: There is no valve in these couplings. Stop the flow of air and water before you disconnect the line.

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

Straight Adapters, BSPT Male Threaded Pipe

Maximum Pressure: 150 psi @ 72° F
Maximum Vacuum: Not Rated
Temperature Range: -20° to 160° F
Compatible With: Dixon Air King Couplings

Zinc-Plated Iron
Pipe Size	Includes		Each
3/4	Safety Clip with Lanyard	00000000	000000
1	Safety Clip with Lanyard	00000000	00000

Replacement Gaskets (10/Pkg.)	0000000	Pkg.	00000
Replacement Safety Clip with Lanyard	0000000	Each	0000

Straight Adapters, BSPP Female Threaded Pipe

Maximum Pressure: 150 psi @ 72° F
Maximum Vacuum: Not Rated
Temperature Range: -20° to 160° F
Compatible With: Dixon Air King Couplings

Zinc-Plated Iron
Pipe Size	Includes		Each
1/2	Safety Clip with Lanyard	00000000	000000
3/4	Safety Clip with Lanyard	00000000	00000
1	Safety Clip with Lanyard	00000000	00000

Replacement Safety Clip with Lanyard	0000000	Each	00000
Replacement Gaskets (10/Pkg.)	0000000	Pkg.	0000

Interlocking-Clamp Hose Fittings for Steam

Also known as ground-joint couplings and boss couplings, these fittings are designed for high-pressure steam heating, humidification, and washdown applications. Insert the barbed end of the fitting into rubber hose, then position the interlocking clamp over the hose and bolt into place with a torque wrench. The clamp firmly grips the hose as it locks into the ring of the barbed end, creating a leak tight seal. The interlocking clamps are not reusable. Fittings are strong and durable with fair corrosion resistance.

Fittings with a female threaded end have a hex bushing (also known as a female spud) that connects to a male interlocking-clamp hose fitting. Replace the hex bushing with a hex nipple (sold separately) to connect two female fittings; the hex nipples are also known as double spuds.

Warning: There is no valve in these couplings. Stop the flow of steam before you disconnect the hose line.

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

Straight Adapters, Barbed × Male Threaded Pipe

Maximum Pressure: 250 psi @ 72° F
Maximum Vacuum: 28 in. of Hg @ 72° F
Temperature Range: -20° to 450° F
Attachment Type: Use Interlocking Clamps (included)
Compatible With: Dixon Boss, Dixon Ground Joint

Adapters							Replacement Interlocking Clamps
For Hose ID	For Hose OD Range	Pipe Size	Thread Type	Clamp Material		Each		Each
Zinc-Plated Iron
2"	2 1/2" to 2 25/32"	2	NPT	Zinc-Plated Iron	0000000	000000	0000000	000000

Straight Adapters, Barbed × Female Threaded Pipe

Maximum Pressure: 250 psi @ 72° F
Maximum Vacuum: 28 in. of Hg @ 72° F
Temperature Range: -20° to 450° F
Attachment Type: Use Interlocking Clamps (included)
Compatible With: Dixon Boss, Dixon Ground Joint

Adapters									Replacement Interlocking Clamps		Replacement Hex Bushings		Hex Nipples
For Hose ID	For Hose OD Range	Pipe Size	Thread Type	Clamp Material	Wing Nut Material	Hex Bushing Material		Each		Each		Each		Each
Zinc-Plated Iron
2"	2 1/2" to 2 25/32"	2	NPT	Zinc-Plated Iron	Zinc-Plated Iron	Zinc-Plated Iron	0000000	0000000	0000000	000000	0000000	000000	0000000	000000

Cam-and-Groove Hose Couplings for Abrasive Material

Made of ductile iron, these couplings are tough enough to handle sand, cement, and other abrasive solids and slurries. They resist impact and wear better than aluminum and brass couplings. Use their cam-and-groove fittings to quickly connect and disconnect medium- to large-diameter hose lines. To connect, insert the plug into the socket and press the levers down. The levers fit snugly into the groove on the plug’s body and force the plug against the gasket, forming a tight seal. To disconnect, lift both levers and pull out the plug. A complete coupling consists of a plug and a socket (both sold separately).

Plugs with male threaded end are also known as F adapters.

Plugs with female threaded end are also known as A adapters.

Sockets with male threaded end are also known as B couplers.

Sockets with female threaded end are also known as D couplers.

Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size.

Warning: Relieve all pressure before disconnecting the couplings. Do not use cam-and-groove couplings with compressed air or gas.

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

Straight Plugs, NPT Male Threaded Pipe

Maximum Pressure: See table
Temperature Range: -20° to 250° F
Specifications Met: Fed. Spec. A-A-59326
Compatible With: Andrews Cam-and-Groove, Dixon Cam-and-Groove, PT Coupling Cam-and-Groove

Ductile Iron
Coupling Size	Plug OD	Pipe Size	Max. Pressure		Each
1	1 7/16"	1	250 psi @ 72° F	0000000	000000
1 1/2	2 1/8"	1 1/2	250 psi @ 72° F	0000000	00000
2	2 1/2"	2	250 psi @ 72° F	0000000	00000
3	3 5/8"	3	200 psi @ 72° F	0000000	00000
4	4 3/4"	4	150 psi @ 72° F	0000000	00000

Straight Plugs, NPT Female Threaded Pipe

Maximum Pressure: See table
Temperature Range: -20° to 250° F
Specifications Met: Fed. Spec. A-A-59326
Compatible With: Andrews Cam-and-Groove, Dixon Cam-and-Groove, PT Coupling Cam-and-Groove

Ductile Iron
Coupling Size	Plug OD	Pipe Size	Max. Pressure		Each
1	1 7/16"	1	250 psi @ 72° F	0000000	000000
1 1/2	2 1/8"	1 1/2	250 psi @ 72° F	0000000	00000
2	2 1/2"	2	250 psi @ 72° F	0000000	00000
3	3 5/8"	3	200 psi @ 72° F	0000000	00000
4	4 3/4"	4	150 psi @ 72° F	0000000	00000

Straight Sockets, NPT Male Threaded Pipe

Maximum Pressure: See table
Temperature Range: -20° to 250° F
Specifications Met: Fed. Spec. A-A-59326
Compatible With: Andrews Cam-and-Groove, Dixon Cam-and-Groove, PT Coupling Cam-and-Groove

Sockets
			Levers						Replacement Gaskets			Replacement Levers		Protective Plugs
Coupling Size	Socket ID	Pipe Size	No. of	Material	Pull Ring Material	Max. Pressure		Each	Pkg. Qty.		Pkg.		Each		Each
Ductile Iron
1	1 7/16"	1	2	300 Series Stainless Steel	300 Series Stainless Steel	250 psi @ 72° F	0000000	000000	10	0000000	00000	0000000	00000	000000	00
1 1/2	2 1/8"	1 1/2	2	300 Series Stainless Steel	300 Series Stainless Steel	250 psi @ 72° F	0000000	00000	10	0000000	0000	0000000	0000	000000	00
2	2 1/2"	2	2	300 Series Stainless Steel	300 Series Stainless Steel	250 psi @ 72° F	0000000	00000	10	0000000	0000	0000000	0000	00000000	000000
3	3 5/8"	3	2	300 Series Stainless Steel	300 Series Stainless Steel	200 psi @ 72° F	0000000	00000	10	0000000	00000	0000000	0000	00000000	00000
4	4 3/4"	4	2	300 Series Stainless Steel	300 Series Stainless Steel	150 psi @ 72° F	0000000	000000	10	0000000	00000	0000000	0000	00000000	00000

Straight Sockets, NPT Female Threaded Pipe

Maximum Pressure: See table
Temperature Range: -20° to 250° F
Specifications Met: Fed. Spec. A-A-59326
Compatible With: Andrews Cam-and-Groove, Dixon Cam-and-Groove, PT Coupling Cam-and-Groove

Sockets
			Levers						Replacement Gaskets			Replacement Levers		Protective Plugs
Coupling Size	Socket ID	Pipe Size	No. of	Material	Pull Ring Material	Max. Pressure		Each	Pkg. Qty.		Pkg.		Each		Each
Ductile Iron
1	1 7/16"	1	2	300 Series Stainless Steel	300 Series Stainless Steel	250 psi @ 72° F	0000000	000000	10	0000000	00000	0000000	00000	000000	00
1 1/2	2 1/8"	1 1/2	2	300 Series Stainless Steel	300 Series Stainless Steel	250 psi @ 72° F	0000000	00000	10	0000000	0000	0000000	0000	000000	00
2	2 1/2"	2	2	300 Series Stainless Steel	300 Series Stainless Steel	250 psi @ 72° F	0000000	00000	10	0000000	0000	0000000	0000	00000000	000000
3	3 5/8"	3	2	300 Series Stainless Steel	300 Series Stainless Steel	200 psi @ 72° F	0000000	00000	10	0000000	00000	0000000	0000	00000000	00000
4	4 3/4"	4	2	300 Series Stainless Steel	300 Series Stainless Steel	150 psi @ 72° F	0000000	000000	10	0000000	00000	0000000	0000	00000000	00000