NPSC Connectors | McMaster-Carr

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29 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.

Low-Pressure Iron and Steel Threaded Pipe Fittings

Use these fittings for low-pressure applications in noncorrosive environments.

Compact straight connectors are able to fit into tight spaces. They are also known as merchant couplings. Connectors with NPSC threads are fully threaded from one end.

Adapters for tanks create an inlet or outlet connection on the surface of any tank, pressure vessel, or drum. Adapters with weld end allow for a permanent connection.

NPTF (Dryseal) threads, NPSC (National Pipe Straight Coupling) threads, and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.

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

Straight Connectors

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 150
Specifications Met: See table
Pipe Nipples and Pipe: Use Schedule 40 steel

NPSC Female—Threaded on Both Ends
Pipe Size	Max. Pressure	Max. Steam Pressure	Material	Specifications Met		Each
1/4	150 psi @ 72° F	150 psi @ 350° F	Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	00000
3/8	150 psi @ 72° F	150 psi @ 350° F	Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	0000
1/2	150 psi @ 72° F	150 psi @ 350° F	Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	0000
3/4	150 psi @ 72° F	150 psi @ 350° F	Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	0000
1	150 psi @ 72° F	150 psi @ 350° F	Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	0000
1 1/4	150 psi @ 72° F	150 psi @ 350° F	Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	00000
1 1/2	150 psi @ 72° F	150 psi @ 350° F	Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	00000
2	150 psi @ 72° F	150 psi @ 350° F	Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	00000

Compact Straight Connectors

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 150
Specifications Met: ASTM A53, ASTM A865
Pipe Nipples and Pipe: Use Schedule 40 steel

NPSC Female—Fully Threaded from One End
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/8	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	00000
1/4	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	0000
3/8	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	0000
1/2	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	0000
3/4	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	0000
1	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	0000
1 1/4	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	00000
1 1/2	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	00000
2	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	00000

Straight Adapters for Curved Tanks

For Use With: Diesel Fuel, Gasoline, Oil, Water
Pipe Nipples and Pipe: Use Schedule 40 steel

NPSC Female × Weld
Pipe Size	For Hole Dia.	For Tank OD	OD	Lg.	Material		Each
1 1/4	1 11/16"	36"	2 13/16"	1/2"	Steel	0000000	00000
1 1/2	1 15/16"	36"	3 1/4"	1/2"	Steel	0000000	0000
2	2 7/16"	26 1/2"	3 11/16"	5/8"	Steel	0000000	0000

Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

The galvanized finish on these fittings provides fair corrosion resistance. Fittings are for use in low-pressure applications.

Compact straight connectors are able to fit into tight spaces. They are also known as merchant couplings. Connectors with NPSC threads are fully threaded from one end.

NPSC (National Pipe Straight Coupling) threads and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.

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

Compact Straight Connectors

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 150
Specifications Met: ASTM A53, ASTM A865, ASTM B633
Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
Flanges: Use Class 150 galvanized steel

NPSC Female—Fully Threaded from One End
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/8	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	000000000	00000
1/4	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	000000000	0000
3/8	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	000000000	0000
1/2	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	000000000	0000
3/4	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	000000000	0000
1	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	000000000	00000
1 1/4	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	000000000	00000
1 1/2	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	000000000	00000
2	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	000000000	00000