Brass Square-Head Plugs | McMaster-Carr

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93 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.

High-Pressure Brass Threaded Pipe Fittings

These fittings have the strength to handle high-pressure applications. They are brass for good corrosion resistance.

Plugs with External Square Drive

For Use With: Air, Natural Gas, Oil, Water
Specifications Met: See table

			Hollow		Solid
Pipe Size	Max. Pressure	Specifications Met		Each		Each
NPT Male
1/8	1,000 psi @ 72° F	__	000000000	00000	000000000	00000
1/4	1,000 psi @ 72° F	__	000000000	0000	000000000	0000
3/8	1,000 psi @ 72° F	__	000000000	0000	000000000	0000
1/2	1,000 psi @ 72° F	__	000000000	0000	000000000	0000
3/4	1,000 psi @ 72° F	__	000000000	00000	000000000	00000
1	1,000 psi @ 72° F	__	000000000	00000	000000	00
BSPT Male
1/8	1,000 psi @ 72° F	SAE J530, SAE J531	000000000	0000	000000	00
1/4	1,000 psi @ 72° F	SAE J530, SAE J531	0000000	00000	000000	00
3/8	1,000 psi @ 72° F	SAE J530, SAE J531	000000000	00000	000000	00
3/4	1,000 psi @ 72° F	SAE J530, SAE J531	000000000	00000	000000	00

High-Pressure Brass Threaded Pipe Fittings with Sealant

Not only do these fittings have the strength to handle high-pressure applications, the male threads have a sealant applied for extra protection against leaks. Fittings are brass for good corrosion resistance.

Plugs with External Square Drive

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

NPT Male
Pipe Size	Plug Construction	Max. Pressure		Each
1/8	Hollow	1,000 psi @ 72° F	000000000	00000
1/4	Hollow	1,000 psi @ 72° F	000000000	0000
3/8	Hollow	1,000 psi @ 72° F	000000000	0000
1/2	Hollow	1,000 psi @ 72° F	000000000	00000
1	Hollow	1,000 psi @ 72° F	000000000	00000

Low-Pressure Brass and Bronze Threaded Pipe Fittings

Use these fittings in low-pressure flow applications. They have good corrosion resistance. Fittings rated for use with drinking water meet NSF/ANSI 61 safety standards.

Plugs with Square Drive

For Use With: Air, Drinking Water, Natural Gas, Oil
Pressure Class: 125
Specifications Met:
NPT: ASME B1.20.1, ASME B16.15, NSF/ANSI 61
BSPT: ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61
Pipe Nipples and Pipe: Use Schedule 40 brass
Flanges: Use Class 150 brass

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Material		Each
1/2	Solid	200 psi @ 72° F	Brass	00000000	000000
3/4	Solid	200 psi @ 72° F	Brass	00000000	00000
1	Solid	200 psi @ 72° F	Brass	00000000	00000
1 1/4	Solid	200 psi @ 72° F	Brass	00000000	00000
1 1/2	Solid	200 psi @ 72° F	Brass	00000000	00000
2	Solid	200 psi @ 72° F	Brass	00000000	00000
2 1/2	Solid	200 psi @ 72° F	Brass	00000000	000000
3	Solid	200 psi @ 72° F	Brass	00000000	000000
4	Solid	200 psi @ 72° F	Brass	00000000	000000
BSPT Male
3/4	Solid	200 psi @ 72° F	Brass	00000000	00000
1	Solid	200 psi @ 72° F	Brass	00000000	00000
1 1/2	Solid	200 psi @ 72° F	Brass	00000000	00000
2	Solid	200 psi @ 72° F	Brass	00000000	00000

Plugs with External Square Drive

For Use With: Air, Drinking Water, Natural Gas, Oil
Pressure Class: 125
Specifications Met: See table
Pipe Nipples and Pipe: Use Schedule 40 brass
Flanges: Use Class 150 brass

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Material	Specifications Met		Each
1/8	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	00000000	00000
1/4	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	00000000	0000
3/8	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	00000000	0000
3/8	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	0000
1/2	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	00000000	0000
1/2	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	00000
3/4	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	00000000	0000
3/4	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	00000
1	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	00000
1	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	00000000	00000
1 1/4	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	00000
1 1/4	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	00000000	00000
1 1/2	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	00000
1 1/2	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	00000000	00000
2	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	00000
2	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	00000000	00000
2 1/2	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	00000000	00000
2 1/2	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	000000
3	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	00000000	000000
3	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	000000
4	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	00000000	000000
4	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	00000000	000000
BSPT Male
1/8	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	00000000	0000
1/4	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	00000000	0000
3/8	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	00000000	0000
1/2	Hollow	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	00000000	00000
1/2	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	00000000	00000
3/4	Hollow	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	00000000	00000
3/4	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	00000000	00000
1	Hollow	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	00000000	00000
1	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	00000000	00000
1 1/4	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	00000000	00000
1 1/2	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	00000000	00000
2	Hollow	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	00000000	00000
2	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	00000000	00000

Low-Pressure Brass Threaded Pipe Fittings with Sealant

The male threads on these fittings have a sealant applied for extra protection against leaks. Also known as Pressure Class 125 fittings, they are built for use in low-pressure applications. They are brass for good corrosion resistance.

Plugs with Square Drive

For Use With: Air, Drinking Water, Natural Gas, Oil, Water
Pressure Class: 125
Pipe Nipples and Pipe: Use Schedule 40 brass
Flanges: Use Class 150 brass

NPT Male
Pipe Size	Plug Construction	Max. Pressure		Each
1/2	Solid	200 psi @ 72° F	0000000	000000
3/4	Solid	200 psi @ 72° F	0000000	00000
1	Solid	200 psi @ 72° F	0000000	00000
1 1/4	Solid	200 psi @ 72° F	0000000	00000
1 1/2	Solid	200 psi @ 72° F	0000000	00000
2	Solid	200 psi @ 72° F	0000000	00000

Plugs with External Square Drive

For Use With: Air, Natural Gas, Oil, Water
Pressure Class: 125
Specifications Met: ASME B1.20.1, ASME B16.15
Pipe Nipples and Pipe: Use Schedule 40 brass
Flanges: Use Class 150 brass

NPT Male
Pipe Size	Plug Construction	Max. Pressure		Each
1/8	Solid	200 psi @ 72° F	0000000	00000
1/4	Solid	200 psi @ 72° F	0000000	0000
3/8	Solid	200 psi @ 72° F	0000000	0000
1/2	Solid	200 psi @ 72° F	0000000	0000
3/4	Solid	200 psi @ 72° F	0000000	00000
1	Solid	200 psi @ 72° F	0000000	00000
1 1/2	Solid	200 psi @ 72° F	0000000	00000
2	Solid	200 psi @ 72° F	0000000	00000

Low-Pressure Plated Brass Threaded Pipe Fittings

Used in low-pressure pipe lines, these brass fittings have a plating that makes them shiny and improves corrosion resistance.

Chrome-plated brass fittings are shinier and withstand corrosion better than nickel-plated brass fittings.

Plugs with External Square Drive

For Use With: Air, Natural Gas, Oil, Steam, Water
Pressure Class: 125
Specifications Met: ASME B16.15, ASTM B456
Pipe Nipples and Pipe: Use Schedule 40 brass

NPT Male
Pipe Size	Plug Construction	Max. Pressure	Max. Steam Pressure		Each
Chrome-Plated Brass
1/8	Solid	200 psi @ 72° F	125 psi @ 400° F	00000000	000000
1/4	Solid	200 psi @ 72° F	125 psi @ 400° F	00000000	00000
3/8	Solid	200 psi @ 72° F	125 psi @ 400° F	00000000	00000
1/2	Solid	200 psi @ 72° F	125 psi @ 400° F	00000000	00000
3/4	Solid	200 psi @ 72° F	125 psi @ 400° F	00000000	00000
1	Solid	200 psi @ 72° F	125 psi @ 400° F	00000000	00000

Extreme-Pressure Brass Threaded Pipe Fittings

Extreme pressures are no problem for these heavy-duty fittings. They are brass for good corrosion resistance.

Plugs with External Square Drive

For Use With: Air, Water
Specifications Met: ISO 7.1, ISO 228

BSPT Male
Pipe Size	Plug Construction	Max. Pressure	Material		Each
1/8	Hollow	1,000 psi @ 72° F	Brass	00000000	00000
1/4	Hollow	1,000 psi @ 72° F	Brass	00000000	00000
3/8	Hollow	1,000 psi @ 72° F	Brass	00000000	00000
1/2	Hollow	1,000 psi @ 72° F	Brass	00000000	00000
3/4	Hollow	1,000 psi @ 72° F	Brass	00000000	00000