Black Iron Pipe Fitting Plugs

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	Material Material	Show

Iron

	Material Material	Hide

	Connection Type Connection Type

	Pipe

	Finish Finish

Black Coated

	Pipe Size Pipe Size

	Thread Type Thread Type

BSPT

NPT

	Type Type

	Cap		Plug

	Drive Style Drive Style


External Square	Square

	For Pipe Material For Pipe Material

Steel

	For Pipe Schedule For Pipe Schedule


40	80

	For Use With For Use With

	Connection Style Connection Style

Threaded

	Maximum Pressure Maximum Pressure

	Shape Shape

	Cap/Plug

	Class Class

125

150

300

	Gender Gender

Male

Female

	Plug Construction Plug Construction

Solid

Hollow

	Maximum Steam Pressure Maximum Steam Pressure

	Length Length

	Specifications Met Specifications Met

ASME

ASTM

DIN

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Body Shape Body Shape

	Square

	Fabrication Fabrication

Cast

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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 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.

Caps

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

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	000000000	00000
1 1/4	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	000000000	0000
1 1/2	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	000000000	0000
2	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	000000000	00000
2 1/2	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	000000000	00000
3	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	000000000	00000
4	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	000000000	00000
6	150 psi @ 72° F	150 psi @ 350° F	Black-Coated Iron	000000000	000000
BSPT Female
1/4	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
3/8	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1/2	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
3/4	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1 1/4	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1 1/2	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
2	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
2 1/2	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	0000000	00000

Plugs with Square Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Class:
Steel: 150
Iron: 125
Pipe Nipples and Pipe: Use Schedule 40 steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material		Each
2 1/2	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	000000
3	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
3 1/2	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
4	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	000000

Plugs with External Square Drive

For Use With:
NPT and BSPT: Air, Natural Gas, Oil, Steam, Water
NPTF: Air, Natural Gas, Steam, Water
Class:
NPT Steel: 125
NPT Iron and BSPT: 150
Specifications Met:
BSPT: DIN EN 10226
Pipe Nipples and Pipe:
NPT and BPST: Use Schedule 40 steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material		Each
2 1/2	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	000000
3	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
3 1/2	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
4	Hollow	175 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
BSPT Male
1/4	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
3/8	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1/2	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
3/4	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1 1/4	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
1 1/2	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
2	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	00000000	0000
2 1/2	Hollow	150 psi @ 72° F	150 psi @ 360° F	Black-Coated Iron	0000000	00000

Low-Pressure Cast Iron Threaded Pipe Fittings

Made of cast iron, these fittings are brittle and can be quickly opened with the strike of a sledge hammer in case of an emergency. They are also known as Class 125 fittings. 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
Class: 125
Specifications Met: UL Listed, ASTM A126, ASME B16.4, ASME B1.20.1
Pipe Nipples and Pipe: Use Schedule 40 steel

NPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
3/4	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
1	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	0000
1 1/4	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	0000
1 1/2	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	0000
2	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	0000
2 1/2	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000

Plugs with Square Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Class: 125
Specifications Met: ASME B16.4, ASTM A126, UL Listed, ASME B16.14, ASME B1.20.1
Pipe Nipples and Pipe: Use Schedule 40 steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material		Each
1	Solid	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
1 1/4	Solid	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	0000
1 1/2	Solid	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	0000
2	Solid	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	0000
2 1/2	Solid	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
3	Solid	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
4	Solid	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000

Plugs with External Square Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Class: 125
Specifications Met: ASME B16.4, ASTM A126, UL Listed, ASME B16.14, ASME B1.20.1
Pipe Nipples and Pipe: Use Schedule 40 steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material		Each
1	Hollow	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
1 1/4	Hollow	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	0000
1 1/2	Hollow	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	0000
2	Hollow	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	0000
2 1/2	Hollow	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
3	Hollow	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	00000
4	Hollow	125 psi @ 72° F	125 psi @ 350° F	Black-Coated Iron	000000000	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
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	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	000000
3/8	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1/2	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
3/4	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1 1/4	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
1 1/2	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
2	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
2 1/2	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
3	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	000000

Plugs with External Square Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Class: 300
Specifications Met: ASTM A126, UL Listed, ASME B16.14, ASME B1.20.1
Pipe Nipples and Pipe: Use Schedule 80 steel
Flanges: Use Class 300 or 600 steel

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure	Material		Each
1/2	Solid	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
3/4	Solid	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	0000
1	Solid	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	0000
1 1/4	Solid	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	0000
1 1/2	Solid	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000
2	Solid	300 psi @ 72° F	300 psi @ 550° F	Iron	00000000	00000