SAE J531 Pipe Plugs | McMaster-Carr

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79 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.

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

Plugs with External Square Drive

For Use With:
NPT and BSPT: Air, Natural Gas, Oil, Steam, Water
NPTF: Air, Natural Gas, Steam, Water
Pressure Class:
NPT Iron: 125
BSPT Iron: 150
Specifications Met:
See table
Pipe Nipples and Pipe:
NPT and BPST: Use Schedule 40 steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material	Specifications Met		Each
1/8	Solid	Not Rated	Not Rated	Steel	ASME B1.20.1, SAE J531	000000000	00000

Low-Pressure Iron and Steel Threaded Pipe Fittings with Sealant

To prevent leaks in low-pressure lines, the male threads on these fittings have an acrylic sealant already applied for extra protection. Also known as Pressure Class 125 or 150 fittings. Made of either iron or steel, they’re best in noncorrosive environments. Even with sealant, threaded connections can be taken apart for maintenance and repair.

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

Plugs with Hex Drive

For Use With: Air, Diesel Fuel, Gasoline, Natural Gas, Oil, Water
Pressure Class: 150
Specifications Met: See table
Pipe Nipples and Pipe: Use Schedule 40 Iron and Steel

NPT Male
Pipe Size	Drive Size	Plug Construction	Max. Pressure	Material	Specifications Met		Each
1/8	3/16"	Solid	150 psi @ 72° F	Steel	SAE J531	0000000	00000
1/4	1/4"	Solid	150 psi @ 72° F	Steel	SAE J531	0000000	000
3/8	5/16"	Solid	150 psi @ 72° F	Steel	SAE J531	0000000	000
1/2	3/8"	Solid	150 psi @ 72° F	Steel	SAE J531	0000000	000
3/4	9/16"	Solid	150 psi @ 72° F	Steel	SAE J531	0000000	0000
1	5/8"	Solid	150 psi @ 72° F	Steel	SAE J531	0000000	0000

Plugs with Square Drive

For Use With: Air, Diesel Fuel, Gasoline, Natural Gas, Oil, Water
Pressure Class: 150
Specifications Met: See table
Pipe Nipples and Pipe: Use Schedule 40 Iron and Steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Material	Specifications Met		Each
1/2	Solid	150 psi @ 72° F	Steel	SAE J531	0000000	00000
3/4	Solid	150 psi @ 72° F	Steel	SAE J531	0000000	0000
1	Solid	150 psi @ 72° F	Steel	SAE J531	0000000	0000

Plugs with External Square Drive

For Use With: Air, Diesel Fuel, Gasoline, Natural Gas, Oil, Water
Pressure Class:
Iron: 125
Steel: 150
Specifications Met: See table
Pipe Nipples and Pipe: Use Schedule 40 Iron and Steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Material	Specifications Met		Each
1/8	Solid	150 psi @ 72° F	Steel	SAE J531	0000000	00000
1/4	Solid	150 psi @ 72° F	Steel	SAE J531	0000000	000
3/8	Solid	150 psi @ 72° F	Steel	SAE J531	0000000	000
1/2	Solid	150 psi @ 72° F	Steel	SAE J531	0000000	000
3/4	Solid	150 psi @ 72° F	Steel	SAE J531	0000000	0000
1	Solid	150 psi @ 72° F	Steel	SAE J531	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.

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

Plugs with Hex Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 150
Specifications Met: SAE J531
Pipe Nipples and Pipe: Use Schedule 40 steel
Flanges: Use Class 150 galvanized steel

NPT Male
Pipe Size	Drive Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/8	3/16"	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	00000
1/4	1/4"	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	000
3/8	5/16"	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	000
1/2	3/8"	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	000
3/4	9/16"	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	000
1	5/8"	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	0000
1 1/4	3/4"	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	0000
1 1/2	1"	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	00000
2	1"	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	00000

Plugs with Square Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 150
Specifications Met: SAE J531
Pipe Nipples and Pipe: Use Schedule 40 steel
Flanges: Use Class 150 galvanized steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material		Each
1/8	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	00000
1/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	000
3/8	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	000
1/2	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	000
3/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	000
1	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	0000
1 1/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	0000
1 1/2	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	00000
2	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	00000

Plugs with External Square Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: See table
Specifications Met:
NPT Steel: SAE J531
NPT Iron: ASME B1.20.1, ASME B16.14, ASTM A126, UL Listed
BSPT: ASTM A197, DIN EN 10226
Pipe Nipples and Pipe: Use Schedule 40 steel
Flanges: Use Class 150 galvanized steel

NPT Male
Pipe Size	Plug Construction	Pressure Class	Max. Pressure	Max. Steam Pressure	Material		Each
1/8	Solid	150	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	00000
1/4	Solid	150	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	000
3/8	Solid	150	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	000
1/2	Solid	150	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	0000
3/4	Solid	150	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	0000
1	Solid	150	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	0000
1 1/4	Solid	150	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	00000
1 1/2	Solid	150	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	00000
2	Solid	150	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	00000000	00000

Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings with Sealant

The male threads on these fittings have a sealant applied for extra leak protection. Fittings are made of galvanized iron or steel, which have fair corrosion resistance. Also known as Pressure Class 125 or 150 fittings, they are for use in low-pressure applications.

NPTF (Dryseal) threads are compatible with NPT threads.

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

Plugs with Hex Drive

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

NPTF Male
Pipe Size	Drive Size	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
1/16	5/32"	Not Rated	Not Rated	SAE J531	0000000	00000
1/8	3/16"	150 psi @ 72° F	Not Rated	SAE J531	0000000	000
1/4	1/4"	150 psi @ 72° F	Not Rated	SAE J531	0000000	000
3/8	5/16"	150 psi @ 72° F	Not Rated	SAE J531	0000000	000
1/2	3/8"	150 psi @ 72° F	Not Rated	SAE J531	0000000	000
3/4	9/16"	150 psi @ 72° F	Not Rated	SAE J531	0000000	0000
1	5/8"	150 psi @ 72° F	Not Rated	SAE J531	0000000	0000

Plugs with Square Drive

For Use With: Air, Oil, Natural Gas, Water
Pressure Class: 150
Specifications Met: SAE J531
Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
Flanges: Use Class 150 galvanized steel

NPTF Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure		Each
1/8	Solid	150 psi @ 72° F	Not Rated	0000000	00000
1/4	Solid	150 psi @ 72° F	Not Rated	0000000	000
3/8	Solid	150 psi @ 72° F	Not Rated	0000000	000
1/2	Solid	150 psi @ 72° F	Not Rated	0000000	000
3/4	Solid	150 psi @ 72° F	Not Rated	0000000	000
1	Solid	150 psi @ 72° F	Not Rated	0000000	0000

Plugs with External Hex Drive

For Use With: Air, Oil, Natural Gas, Water
Pressure Class: 150
Specifications Met: SAE J531
Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
Flanges: Use Class 150 galvanized steel

NPTF Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure		Each
1/8	Solid	Not Rated	Not Rated	0000000	00000
1/4	Solid	Not Rated	Not Rated	0000000	000
3/8	Solid	Not Rated	Not Rated	0000000	000
1/2	Solid	Not Rated	Not Rated	0000000	0000
3/4	Solid	Not Rated	Not Rated	0000000	0000
1	Solid	Not Rated	Not Rated	0000000	0000

Plugs with External Square Drive

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

NPTF Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
1/8	Solid	150 psi @ 72° F	Not Rated	SAE J531	0000000	00000
1/4	Solid	150 psi @ 72° F	Not Rated	SAE J531	0000000	000
3/8	Solid	150 psi @ 72° F	Not Rated	SAE J531	0000000	000
1/2	Solid	150 psi @ 72° F	Not Rated	SAE J531	0000000	0000
3/4	Solid	150 psi @ 72° F	Not Rated	SAE J531	0000000	0000
1	Solid	150 psi @ 72° F	Not Rated	SAE J531	0000000	0000

Premium Low-Pressure Stainless Steel Threaded Pipe Fittings with Certification

Unlike other stainless steel fittings, these are made in the U.S.A. for superior quality. As another marker of quality, they come with a certificate with a traceable lot number and test report that guarantees material composition. All fittings except 1/4" and 3/8" plugs and plugs with hex drive adhere to ANSI/MSS SP-114 standards for heat treating, material thickness, and marking. It’s the highest quality standard for Pressure Class 150 low-pressure stainless steel fittings. They also meet either ASTM A351 or A479 requirements for parts that will be used in pressure systems.

These stainless steel fittings are more corrosion resistant than steel fittings, and almost as strong. 316 stainless steel fittings are the most corrosion resistant. They stand up to wet environments, just like 304 stainless steel fittings, but unlike 304 stainless steel, they will not corrode from salt water, chlorine solutions, and chemicals.

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

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Plugs with External Hex Drive

Plug with External Hex Drive

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: See table
Fabrication: Heat Treated
Specifications Met: See table
Certification: Material Certificate with Traceable Lot Number
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Flanges: Use Class 150 stainless steel

						316 Stainless Steel
Pipe Size	Drive Size	Pressure Class	Max. Pressure	Max. Steam Pressure	Specifications Met		Each
NPTF Male
1/4	9/16"	150	270 psi @ 72° F	150 psi @ 350° F	ASTM A479, SAE J405, SAE J531	0000000	00000
3/8	11/16"	150	270 psi @ 72° F	150 psi @ 350° F	ASTM A479, SAE J405, SAE J531	0000000	0000

High-Pressure Brass Threaded Pipe Fittings

These fittings have the strength to handle high-pressure applications. They are brass for good corrosion resistance.

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

Plugs with External Hex Drive and Gasket

BSPP Male Threads with Gasket

For Use With: Air, Water, Natural Gas, Oil
Specifications Met: SAE J530, SAE J531

			Hollow		Solid
Pipe Size	Max. Pressure	Gasket Material		Each		Each
BSPP Male
1/8	1,000 psi @ 72° F	Nylon Plastic	000000	00	000000000	00000
1/4	1,000 psi @ 72° F	Nylon Plastic	000000000	00000	000000	00
3/8	1,000 psi @ 72° F	Nylon Plastic	000000000	00000	000000	00
1/2	1,000 psi @ 72° F	Nylon Plastic	000000000	00000	000000	00

Plugs with External Square Drive

For Use With: Air, Natural Gas, Oil, Water
Specifications Met: See table

			Hollow
Pipe Size	Max. Pressure	Specifications Met		Each
BSPT Male
1/8	1,000 psi @ 72° F	SAE J530, SAE J531	000000000	00000
1/4	1,000 psi @ 72° F	SAE J530, SAE J531	0000000	00000
3/8	1,000 psi @ 72° F	SAE J530, SAE J531	000000000	00000
3/4	1,000 psi @ 72° F	SAE J530, SAE J531	000000000	00000

Plugs with Slotted Drive

For Use With: Air, Natural Gas, Oil, Water

	Hollow
Max. Pressure		Each
Metric Male
1,000 psi @ 72° F	000000000	00000