Steel Square-Socket Pipe Fitting Plugs

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40 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

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	44605K672	00000
1/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	44605K673	000
3/8	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	44605K674	000
1/2	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	44605K675	000
3/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	44605K676	000
1	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	44605K677	0000
1 1/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	44605K678	0000
1 1/2	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	44605K679	00000
2	Solid	150 psi @ 72° F	150 psi @ 350° F	Steel	44605K681	00000
2 1/2	Hollow	175 psi @ 72° F	125 psi @ 350° F	Iron	44605K705	00000
3	Hollow	175 psi @ 72° F	125 psi @ 350° F	Iron	44605K706	00000
3 1/2	Hollow	175 psi @ 72° F	125 psi @ 350° F	Iron	44605K707	00000
4	Hollow	175 psi @ 72° F	125 psi @ 350° F	Iron	44605K708	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	5245N42	00000
3/4	Solid	150 psi @ 72° F	Steel	SAE J531	5245N43	0000
1	Solid	150 psi @ 72° F	Steel	SAE J531	5245N44	0000
1 1/4	Solid	150 psi @ 72° F	Steel	ASME B16.14	5245N45	0000
2	Solid	150 psi @ 72° F	Steel	ASME B16.14	5245N46	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	68115K105	000000
1 1/4	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	68115K106	00000
1 1/2	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	68115K107	00000
2	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	68115K108	00000
2 1/2	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	68115K109	00000
3	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	68115K111	00000
4	Solid	175 psi @ 72° F	125 psi @ 350° F	Iron	68115K112	000000

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.

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	4638K714	00000
1/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	4638K715	000
3/8	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	4638K716	000
1/2	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	4638K717	000
3/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	4638K718	000
1	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	4638K719	0000
1 1/4	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	4638K721	0000
1 1/2	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	4638K722	00000
2	Solid	150 psi @ 72° F	150 psi @ 350° F	Galvanized Steel	4638K723	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.

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	1162T44	00000
1/4	Solid	150 psi @ 72° F	Not Rated	1162T45	000
3/8	Solid	150 psi @ 72° F	Not Rated	1162T46	000
1/2	Solid	150 psi @ 72° F	Not Rated	1162T47	000
3/4	Solid	150 psi @ 72° F	Not Rated	1162T48	000
1	Solid	150 psi @ 72° F	Not Rated	1162T49	0000