Iron Square-Socket Pipe Fitting Plugs

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25 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.

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
1/8	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	00000
1/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	000
3/8	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	000
1/2	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	000
3/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	000
1	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	0000
1 1/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	0000
1 1/2	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	00000
2	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	000000000	00000
2 1/2	Hollow	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
3	Hollow	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
3 1/2	Hollow	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	00000
4	Hollow	175 psi @ 72° F	125 psi @ 350° F	Iron	000000000	000000

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.

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
1 1/4	Solid	150 psi @ 72° F	Steel	ASME B16.14	0000000	0000
2	Solid	150 psi @ 72° F	Steel	ASME B16.14	0000000	00000

FM-Approved Low-Pressure Cast Iron Threaded Pipe Fittings

Suitable for use in fire-protection applications, these pipe fittings are made of cast iron, so they are brittle and can be quickly opened with the strike of a sledge hammer. They are also known as Pressure Class 125 fittings. Use in noncorrosive environments.

Plugs with Square Drive

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

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