Brass Square-Head Plugs | McMaster-Carr

Filter by

Material

Brass

Drive Style

External Square

Square

System of Measurement

Pipe Size

Fitting Type

Thread Type

Pipe Material

For Use With

Plug Construction

Maximum Pressure @ Temperature

Flange Material

Shape

Length

Gender

Body Shape

Pressure Class

Fitting Connection

RoHS

Compliant with Exemptions

Specifications Met

Connects To

REACH

Construction

U.S.–Mexico–Canada Agreement (USMCA) Qualifying

Yes

DFARS Specialty Metals

Exempt

Export Control Classification Number (ECCN)

EAR99

Pipe Schedule

Forward

How can we improve?

93 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.

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	__	50785K131	00000	50785K252	00000
1/4	1,000 psi @ 72° F	__	50785K132	0000	50785K253	0000
3/8	1,000 psi @ 72° F	__	50785K133	0000	50785K254	0000
1/2	1,000 psi @ 72° F	__	50785K255	0000	50785K135	0000
3/4	1,000 psi @ 72° F	__	50785K256	00000	50785K136	00000
1	1,000 psi @ 72° F	__	50785K134	00000	______	00
BSPT Male
1/8	1,000 psi @ 72° F	SAE J530, SAE J531	50785K798	0000	______	00
1/4	1,000 psi @ 72° F	SAE J530, SAE J531	50785K8	00000	______	00
3/8	1,000 psi @ 72° F	SAE J530, SAE J531	50785K803	00000	______	00
3/4	1,000 psi @ 72° F	SAE J530, SAE J531	50785K806	00000	______	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	50785K287	00000
1/4	Hollow	1,000 psi @ 72° F	50785K288	0000
3/8	Hollow	1,000 psi @ 72° F	50785K289	0000
1/2	Hollow	1,000 psi @ 72° F	50785K341	00000
1	Hollow	1,000 psi @ 72° F	50785K292	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	4429K191	000000
3/4	Solid	200 psi @ 72° F	Brass	4429K192	00000
1	Solid	200 psi @ 72° F	Brass	4429K193	00000
1 1/4	Solid	200 psi @ 72° F	Brass	4429K396	00000
1 1/2	Solid	200 psi @ 72° F	Brass	4429K194	00000
2	Solid	200 psi @ 72° F	Brass	4429K195	00000
2 1/2	Solid	200 psi @ 72° F	Brass	4429K397	000000
3	Solid	200 psi @ 72° F	Brass	4429K196	000000
4	Solid	200 psi @ 72° F	Brass	4429K197	000000
BSPT Male
3/4	Solid	200 psi @ 72° F	Brass	4978K352	00000
1	Solid	200 psi @ 72° F	Brass	4978K353	00000
1 1/2	Solid	200 psi @ 72° F	Brass	4978K354	00000
2	Solid	200 psi @ 72° F	Brass	4978K355	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	4429K311	00000
1/4	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K312	0000
3/8	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K281	0000
3/8	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	4429K313	0000
1/2	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K282	0000
1/2	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	4429K314	00000
3/4	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K283	0000
3/4	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	4429K315	00000
1	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	4429K316	00000
1	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K287	00000
1 1/4	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	4429K317	00000
1 1/4	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K288	00000
1 1/2	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	4429K318	00000
1 1/2	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K289	00000
2	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	4429K319	00000
2	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K291	00000
2 1/2	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K284	00000
2 1/2	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	4429K467	000000
3	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K285	000000
3	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	4429K468	000000
4	Hollow	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K286	000000
4	Solid	200 psi @ 72° F	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	4429K469	000000
BSPT Male
1/8	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	4978K356	0000
1/4	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	4978K357	0000
3/8	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	4978K358	0000
1/2	Hollow	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	4978K366	00000
1/2	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	4978K359	00000
3/4	Hollow	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	4978K367	00000
3/4	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	4978K361	00000
1	Hollow	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	4978K368	00000
1	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	4978K362	00000
1 1/4	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	4978K363	00000
1 1/2	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	4978K364	00000
2	Hollow	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	4978K369	00000
2	Solid	200 psi @ 72° F	Brass	ASME B16.15, ASME BS21, ASTM B584, NSF/ANSI 61	4978K365	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	2725K44	000000
3/4	Solid	200 psi @ 72° F	2725K45	00000
1	Solid	200 psi @ 72° F	2725K46	00000
1 1/4	Solid	200 psi @ 72° F	2725K88	00000
1 1/2	Solid	200 psi @ 72° F	2725K47	00000
2	Solid	200 psi @ 72° F	2725K48	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	2725K85	00000
1/4	Solid	200 psi @ 72° F	2725K86	0000
3/8	Solid	200 psi @ 72° F	2725K87	0000
1/2	Solid	200 psi @ 72° F	2725K38	0000
3/4	Solid	200 psi @ 72° F	2725K39	00000
1	Solid	200 psi @ 72° F	2725K41	00000
1 1/2	Solid	200 psi @ 72° F	2725K42	00000
2	Solid	200 psi @ 72° F	2725K43	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	9162K191	000000
1/4	Solid	200 psi @ 72° F	125 psi @ 400° F	9162K192	00000
3/8	Solid	200 psi @ 72° F	125 psi @ 400° F	9162K193	00000
1/2	Solid	200 psi @ 72° F	125 psi @ 400° F	9162K194	00000
3/4	Solid	200 psi @ 72° F	125 psi @ 400° F	9162K195	00000
1	Solid	200 psi @ 72° F	125 psi @ 400° F	9162K196	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	4860K315	00000
1/4	Hollow	1,000 psi @ 72° F	Brass	4860K316	00000
3/8	Hollow	1,000 psi @ 72° F	Brass	4860K317	00000
1/2	Hollow	1,000 psi @ 72° F	Brass	4860K318	00000
3/4	Hollow	1,000 psi @ 72° F	Brass	4860K319	00000