NPSC Connectors | McMaster-Carr

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21 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

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.

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	46685K261	00000
1/4	150 psi @ 72° F	150 psi @ 350° F	Steel	46685K262	0000
3/8	150 psi @ 72° F	150 psi @ 350° F	Steel	46685K263	0000
1/2	150 psi @ 72° F	150 psi @ 350° F	Steel	46685K264	0000
3/4	150 psi @ 72° F	150 psi @ 350° F	Steel	46685K265	0000
1	150 psi @ 72° F	150 psi @ 350° F	Steel	46685K266	0000
1 1/4	150 psi @ 72° F	150 psi @ 350° F	Steel	46685K267	00000
1 1/2	150 psi @ 72° F	150 psi @ 350° F	Steel	46685K268	00000
2	150 psi @ 72° F	150 psi @ 350° F	Steel	46685K269	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	1698T12	00000
1 1/2	1 15/16"	36"	3 1/4"	1/2"	Steel	1698T13	0000
2	2 7/16"	26 1/2"	3 11/16"	5/8"	Steel	1698T14	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.

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	46685K461	00000
1/4	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	46685K462	0000
3/8	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	46685K463	0000
1/2	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	46685K464	0000
3/4	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	46685K465	0000
1	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	46685K466	00000
1 1/4	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	46685K467	00000
1 1/2	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	46685K468	00000
2	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	46685K469	00000