NPSL Pipe Fittings | McMaster-Carr

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62 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 Stainless Steel Threaded Pipe Fittings

Use these fittings in a low-pressure pipe line.

Fittings that meet ANSI/MSS SP-114 adhere to high-quality standards for heat treating, material thickness, and marking. 304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.

Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.

NPTF (Dryseal) 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.

Locknuts

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class:
NPSL: 150
Fabrication:
NPSL: Heat Treated
Specifications Met:
NPSL: ANSI/MSS SP-114, ASTM A351
BSPP: DIN 431
Pipe Nipples and Pipe:
NPSL: Use Schedule 40 stainless steel
Flanges:
NPSL: Use Class 150 stainless steel

			304 Stainless Steel		316 Stainless Steel
Pipe Size	Max. Pressure	Max. Steam Pressure		Each		Each
NPSL Female
1/8	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
1/4	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	00000000	0000
3/8	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	00000000	0000
1/2	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	00000000	0000
3/4	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	00000000	0000
1	300 psi @ 72° F	150 psi @ 350° F	00000000	0000	00000000	00000
1 1/4	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
1 1/2	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
2	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
2 1/2	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
3	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000
4	300 psi @ 72° F	150 psi @ 350° F	00000000	00000	00000000	00000

Low-Pressure Iron and Steel Threaded Pipe Fittings

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

Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.

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.

Locknuts

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class:
NPT: 125
NPSL: 150
Specifications Met:
NPT: ASME B1.20.1, ASME B16.4
NPSL: ASME B16.14
BSPP: DIN 431
Pipe Nipples and Pipe:
NPT, NPSL: Use Schedule 40 steel

NPSL Female
Pipe Size	Material		Each
1/8	Steel	000000000	00000
1/4	Steel	000000000	0000
3/8	Iron	000000000	0000
1/2	Iron	000000000	0000
3/4	Iron	000000000	0000
1	Iron	000000000	0000
1 1/4	Iron	000000000	0000
1 1/2	Iron	000000000	00000
2	Iron	000000000	00000

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.

Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.

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.

Locknut

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 150
Specifications Met: ASME B16.14
Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
Flanges: Use Class 150 galvanized steel

NPSL Female
Pipe Size	Material		Each
1/4	Galvanized Iron	00000000	00000
3/8	Galvanized Iron	00000000	0000
1/2	Galvanized Iron	00000000	0000
3/4	Galvanized Iron	00000000	0000
1	Galvanized Iron	00000000	00000
1 1/4	Galvanized Iron	00000000	00000
1 1/2	Galvanized Iron	00000000	00000
2	Galvanized Iron	00000000	00000

Low-Pressure Brass and Bronze Threaded Pipe Fittings

Use these fittings in low-pressure flow applications. They have good corrosion resistance. Fittings rated for use with drinking water meet NSF/ANSI 61 safety standards.

Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.

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

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

Locknuts

For Use With: See table
Pressure Class: See table
Specifications Met: See table
Pipe Nipples and Pipe: See table
Flanges: See table

				For Pipe		For Flange
Pipe Size	Max. Pressure	Pressure Class	Material	Schedule	Material	Class	Material	For Use With	Specifications Met		Each
NPSL Female
1/8	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	00000
1/4	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	0000
3/8	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	0000
1/2	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	0000
3/4	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	0000
1	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	0000
1 1/4	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	00000
1 1/2	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	00000
2	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Drinking Water, Natural Gas, Oil	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	00000
2 1/2	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Natural Gas, Oil	ASME B16.15	00000000	00000
3	200 psi @ 72° F	125	Brass	40	Brass	150	Brass	Air, Natural Gas, Oil	ASME B16.15	00000000	00000

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.

Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.

NPTF (Dryseal) 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.

Locknuts

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

NPSL Female
Pipe Size	Max. Pressure		Each
1/4	150 psi @ 72° F	000000000	00000
3/8	150 psi @ 72° F	000000000	0000
1/2	150 psi @ 72° F	000000000	0000
3/4	150 psi @ 72° F	000000000	00000
1	150 psi @ 72° F	000000000	00000
1 1/4	150 psi @ 72° F	000000000	00000
1 1/2	150 psi @ 72° F	000000000	00000
2	150 psi @ 72° F	000000000	00000
2 1/2	150 psi @ 72° F	000000000	00000
3	150 psi @ 72° F	000000000	00000