NPSC Connectors | McMaster-Carr

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	Type Type


Adapter	Connector

	Pipe Size Pipe Size

	Material Material

Iron

Steel

	Finish Finish

Black Coated

Galvanized

	Shape Shape

	Straight

	For Pipe Schedule For Pipe Schedule

	40

	For Pipe Material For Pipe Material

Galvanized Steel

Steel

	Connection Style Connection Style

Threaded

	System of Measurement System of Measurement

Inch

	Length Length

	Gender Gender

Female

	Pressure Class Pressure Class

150

	For Use With For Use With

	Connection Type Connection Type

	Pipe

	Straight Connector Threading Straight Connector Threading

Threaded on Both Ends

Fully Threaded from One End

	Thread Type Thread Type	Show

NPSC

	Thread Type Thread Type	Hide

	Maximum Pressure Maximum Pressure

150 psi @ 72° F

Not Rated

	Specifications Met Specifications Met

ASME

ASTM

	Maximum Steam Pressure Maximum Steam Pressure

150 psi @ 350° F

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Weight Weight

Less than 10 lbs.

	Tank Connection Type Tank Connection Type

	Weld

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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
1/8	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Steel	ASME B1.20.1, ASME B16.3, UL Listed	000000000	00000
1/4	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	0000
3/8	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	0000
1/2	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	0000
3/4	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	0000
1	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	0000
1 1/4	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	00000
1 1/2	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	ASME B1.20.1, ASME B16.3, UL Listed	000000000	00000
2	150 psi @ 72° F	150 psi @ 350° F	Black-Coated 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	Black-Coated Steel	000000000	00000
1/4	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Steel	000000000	0000
3/8	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Steel	000000000	0000
1/2	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Steel	000000000	0000
3/4	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Steel	000000000	0000
1	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Steel	000000000	0000
1 1/4	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Steel	000000000	00000
1 1/2	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Steel	000000000	00000
2	150 psi @ 72° F	150 psi @ 350° F	Black-Coated 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