Iron Square-Socket Pipe Fitting Plugs

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	Drive Style Drive Style	Show

Square

	Drive Style Drive Style	Hide

External Square

Square

Slotted

	Material Material	Show

Iron

	Material Material	Hide

	Pipe Size Pipe Size

1
1 1/4
1 1/2
2
2 1/2
3
3 1/2
4

	Thread Type Thread Type

NPT

	Type Type

	Plug

	Plug Construction Plug Construction

Solid

Hollow

	For Use With For Use With

	For Pipe Material For Pipe Material

Steel

	Shape Shape

	Cap/Plug

	Length Length

	For Pipe Schedule For Pipe Schedule

	40

	Pressure Class Pressure Class

125

	Connection Style Connection Style

Threaded

	Gender Gender

Male

	Maximum Steam Pressure Maximum Steam Pressure

125 psi @ 350° F

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

DFARS Specialty Metals
COTS-Exempt

	Connection Type Connection Type

	Pipe

	Maximum Pressure Maximum Pressure

125 psi @ 72° F

175 psi @ 72° F

	Finish Finish

Black Coated

	REACH (Registration, Evaluation, Authorization and Restriction of Chemicals) REACH (Registration, Evaluation, Authorization and Restriction of Chemicals)

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Specifications Met Specifications Met

ASME

ASTM

	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.

Plugs with Square Drive

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

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 Pressure Class 125 fittings. Use in noncorrosive environments.

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

Plugs with Square Drive

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 125
Specifications Met: ASME B16.14, ASME B16.4, ASTM A126, 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	Iron	000000000	00000
1 1/4	Solid	125 psi @ 72° F	125 psi @ 350° F	Iron	000000000	0000
1 1/2	Solid	125 psi @ 72° F	125 psi @ 350° F	Iron	000000000	0000
2	Solid	125 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
2 1/2	Solid	125 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
3	Solid	125 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
4	Solid	125 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000