ASTM A197 Pipe Caps | McMaster-Carr

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150 psi @ 360° F

300 psi @ 550° F

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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 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.

Caps

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 150
Specifications Met:
NPT: ASME B1.20.1, ASME B16.3, ASTM A153, UL Listed
BSPT: ASTM A197, DIN EN 10226
Pipe Nipples and Pipe: Use Schedule 40 steel
Flanges: Use Class 150 galvanized steel

BSPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/4	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	00000000	00000
3/8	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	00000000	0000
1/2	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	00000000	0000
3/4	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	00000000	0000
1	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	00000000	0000
1 1/2	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	00000000	0000
2	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	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

BSPT Male
Pipe Size	Plug Construction	Pressure Class	Max. Pressure	Max. Steam Pressure	Material		Each
1/4	Hollow	150	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	00000000	00000
3/8	Hollow	150	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	00000000	0000
1/2	Hollow	150	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	00000000	0000
3/4	Hollow	150	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	00000000	0000
1	Hollow	150	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	00000000	0000
1 1/2	Hollow	150	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	00000000	0000
2	Hollow	150	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	00000000	00000

Medium-Pressure Iron and Steel Threaded Pipe Fittings

With better strength than our low-pressure iron and steel pipe fittings, these can handle medium-pressure applications. They are for use in noncorrosive environments.

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

Caps

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class : 300
Specifications Met: ASTM A197, UL Listed, ASME B16.3, ASME B1.20.1
Pipe Nipples and Pipe: Use Schedule 80 steel
Flanges: Use Class 300 or 600 steel

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/4	2,000 psi @ 72° F	300 psi @ 550° F	Iron	00000000	000000
3/8	2,000 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1/2	2,000 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
3/4	2,000 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1	2,000 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1 1/4	1,500 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1 1/2	1,500 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
2	1,500 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
2 1/2	1,000 psi @ 72° F	300 psi @ 550° F	Iron	00000000	000000
3	1,000 psi @ 72° F	300 psi @ 550° F	Iron	00000000	000000

Plugs with Hex Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class : 300
Specifications Met: See Table
Pipe Nipples and Pipe: Use Schedule 80 steel
Flanges: Use Class 300 or 600 steel

NPT Male
Pipe Size	Drive Size	Max. Pressure	Max. Steam Pressure	Material	Specifications Met		Each
1/4	1/4"	2,000 psi @ 72° F	300 psi @ 550° F	Steel	ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed	0000000	00000
3/8	5/16"	2,000 psi @ 72° F	300 psi @ 550° F	Steel	ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed	0000000	000
1/2	3/8"	2,000 psi @ 72° F	300 psi @ 550° F	Steel	ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed	0000000	0000
3/4	9/16"	2,000 psi @ 72° F	300 psi @ 550° F	Steel	ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed	0000000	0000
1	5/8"	2,000 psi @ 72° F	300 psi @ 550° F	Steel	ASME B1.20.1, ASME B16.14, ASME B16.3, ASTM A197, UL Listed	0000000	0000

Medium-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

A galvanized finish gives these fittings fair corrosion resistance. They have the strength to handle medium-pressure applications.

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

Caps

For Use With: Air, Natural Gas, Steam, Water
Pressure Class : 300
Specifications Met: ASTM A153, ASTM A197, ASME B16.3, ASME B1.20.1
Pipe Nipples and Pipe: Use Schedule 80 steel
Flanges: Use Class 300 steel

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/4	2,000 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	0000000	000000
3/8	2,000 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	000000	00000
1/2	2,000 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	0000000	00000
3/4	2,000 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	0000000	00000
1	2,000 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	0000000	00000
1 1/4	1,500 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	0000000	00000
1 1/2	1,500 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	0000000	00000
2	1,500 psi @ 72° F	300 psi @ 550° F	Galvanized Iron	0000000	000000