ASTM A865 Pipe Fittings | McMaster-Carr

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150 psi @ 350° F

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31 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. Connectors with NPT threads are threaded on both ends.

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	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
NPT Female—Threaded on Both Ends
2 1/2	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	00000
3	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	00000
4	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	000000

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.

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	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
NPT Female—Threaded on Both Ends
2 1/2	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	000000000	00000
3	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	000000000	00000
4	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	000000000	000000

Low-Pressure Aluminum Threaded Pipe Fittings

In addition to being lightweight, these aluminum fittings offer good corrosion resistance. Use them in low-pressure flow applications. To prevent cracking, do not tighten more than a 1/4-turn past hand tight.

Threaded female x butt weld straight adapters are also known as half couplings.

Straight Adapters

For Use With: Air, Oil, Water
Specifications Met: See table
Pressure Class: 150
Pipe Nipples and Pipe: Use Schedule 40 aluminum
Flanges: Use Class 125 aluminum

NPT Female × Butt Weld
Pipe Size	Max. Pressure	Specifications Met		Each
3/8	150 psi @ 72° F	ASME B1.20.1, ASTM A865, ASTM B221	000000000	00000
1/2	150 psi @ 72° F	ASME B1.20.1, ASTM A865, ASTM B221	000000000	0000
1 1/4	150 psi @ 72° F	ASME B1.20.1, ASTM A865, ASTM B221	000000000	0000
1 1/2	150 psi @ 72° F	ASME B1.20.1, ASTM A865, ASTM B221	000000000	0000
2	150 psi @ 72° F	ASME B1.20.1, ASTM A865, ASTM B221	000000000	00000
4	150 psi @ 72° F	ASME B1.20.1, ASTM A865, ASTM B221	000000000	00000
6	150 psi @ 72° F	ASME B1.20.1, ASTM A865, ASTM B221	000000000	000000