Brass Unions Pipe | McMaster-Carr

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	Pipe Size Pipe Size

	Thread Type Thread Type

NPT

NPTF

	Type Type	Show

Union

	Type Type	Hide

	Material Material	Show

Brass

	Material Material	Hide

	For Use With For Use With

	For Pipe Material For Pipe Material

Brass

Iron

	Shape Shape

	Straight

	Connection Style Connection Style

Threaded

	Maximum Pressure Maximum Pressure

	Gender Gender

Female

	Connection Type Connection Type

	Pipe

	For Pipe Schedule For Pipe Schedule


40	80

	Length Length

	Pressure Class Pressure Class

125

250

	Body Shape Body Shape

	Hex

	Hex Width Hex Width

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

DFARS Specialty Metals
COTS-Exempt

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

RoHS Compliant

RoHS Compliant with
Exemptions

	Specifications Met Specifications Met

ASME

ASTM

NSF/ANSI

	Environment Environment

Food and Beverage

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

REACH Compliant

	Fabrication Fabrication

Machined

	Gasket Material Gasket Material

Rubber

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41 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.

Medium-Pressure Pipe Fittings for Joining Dissimilar Metals

Use these unions to connect different metals in a piping or plumbing system. They have a plastic sleeve that inhibits destructive corrosion. Use them for connections that must be electrically insulated. Unions separate into three pieces for access to your line.

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

Union Straight Connectors

Exploded View

For Use With: Air, Water, Oil, Natural Gas
Max.Temperature: 180° F

		Iron × Brass
Pipe Size	Max. Pressure		Each
NPT Female
1/2	250 psi @ 72° F	0000000	000000
3/4	250 psi @ 72° F	0000000	00000
1	250 psi @ 72° F	0000000	00000
1 1/4	250 psi @ 72° F	0000000	000000
1 1/2	250 psi @ 72° F	0000000	000000
2	250 psi @ 72° F	0000000	000000

High-Pressure Brass Threaded Pipe Fittings

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

Union connectors separate into three pieces so you can access your line without unthreading pipe connections.

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

Union Straight Connectors, Female

Exploded View

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

NPT Female
Pipe Size	Max. Pressure		Each
1/8	1,000 psi @ 72° F	000000000	000000
1/4	1,000 psi @ 72° F	000000000	00000
3/8	1,000 psi @ 72° F	000000000	00000
1/2	1,000 psi @ 72° F	000000000	00000
3/4	1,000 psi @ 72° F	000000000	00000

High-Pressure Brass Threaded Pipe Fittings for Drinking Water

Use these heavy duty fittings for high-pressure drinking water applications. They are brass which has good corrosion resistance. They meet NSF/ANSI 61 safety standards for use with drinking water systems.

Union connectors separate into three pieces so you can access your line without unthreading pipe connections.

NPTF (Dryseal) threads are compatible with NPT threads.

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

Union Straight Connectors

Exploded View

For Use With: Drinking Water
Specifications Met: NSF/ANSI 61

NPTF Female
Pipe Size	Max. Pressure		Each
1/8	1,000 psi @ 72° F	00000000	000000
1/4	1,000 psi @ 72° F	00000000	00000
3/8	1,000 psi @ 72° F	00000000	00000
1/2	1,000 psi @ 72° F	00000000	00000
3/4	1,000 psi @ 72° F	00000000	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.

Union connectors separate into three pieces so you can access your line without unthreading pipe connections.

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

Union Straight Connectors

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

NPT Female
Pipe Size	Max. Pressure	Material		Each
1/8	200 psi @ 72° F	Brass	00000000	000000
1/4	200 psi @ 72° F	Brass	00000000	00000
3/8	200 psi @ 72° F	Brass	00000000	00000
1/2	200 psi @ 72° F	Brass	00000000	00000
3/4	200 psi @ 72° F	Brass	00000000	00000
1	200 psi @ 72° F	Brass	00000000	00000
1 1/4	200 psi @ 72° F	Brass	00000000	00000
1 1/2	200 psi @ 72° F	Brass	00000000	000000
2	200 psi @ 72° F	Brass	00000000	000000
2 1/2	200 psi @ 72° F	Brass	00000000	000000
3	200 psi @ 72° F	Brass	00000000	000000

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.

Union connectors separate into three pieces so you can access your line without unthreading pipe connections.

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

Union Straight Connectors

Exploded View

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

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

Medium-Pressure Brass and Bronze Threaded Pipe Fittings

Choose these fittings when you need better strength than our low-pressure brass and bronze pipe fittings. They offer good corrosion resistance.

Union connectors separate into three pieces so you can access your line without unthreading pipe connections.

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

Union Straight Connectors

Exploded View

For Use With: Air, Natural Gas, Oil, Water
Pressure Class: 250
Specifications Met: ASME B1.20.1, ASME B16.15, ASTM B584
Pipe Nipples and Pipe: Use Schedule 80 brass

NPT Female
Pipe Size	Max. Pressure	Material		Each
1/4	400 psi @ 72° F	Brass	0000000	000000
3/8	400 psi @ 72° F	Brass	0000000	000000
1/2	400 psi @ 72° F	Brass	0000000	00000
3/4	400 psi @ 72° F	Brass	0000000	00000
1	400 psi @ 72° F	Brass	0000000	000000
1 1/4	400 psi @ 72° F	Brass	0000000	000000
1 1/2	400 psi @ 72° F	Brass	0000000	000000
2	400 psi @ 72° F	Brass	0000000	000000