Unions for Brass Pipe | McMaster-Carr

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	Pipe Size Pipe Size

	Thread Type Thread Type

BSPT

NPT

	Type Type	Show

Union

	Type Type	Hide

	Material Material

	For Use With For Use With

	For Pipe Material For Pipe Material	Show

Brass

	For Pipe Material For Pipe Material	Hide

	Connection Style Connection Style

Threaded

Socket Connect

	Shape Shape

	Straight

	Maximum Pressure Maximum Pressure

	For Pipe Schedule For Pipe Schedule


40	80

	Gender Gender

Female

	Body Shape Body Shape

	Hex

	Connection Type Connection Type

	Pipe

	System of Measurement System of Measurement

Inch

	Length Length

	Hex Width Hex Width

	Pressure Class Pressure Class

125

250

	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

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

REACH Compliant

	Environment Environment

Food and Beverage

	Schedule Schedule


40	80

	Socket Connect Type Socket Connect Type


Cement	Braze

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60 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

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	Max. Steam 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
BSPT Female
1/8	200 psi @ 72° F	125 psi @ 400° F	Bronze	00000000	00000
1/4	200 psi @ 72° F	125 psi @ 400° F	Bronze	00000000	00000
3/8	200 psi @ 72° F	125 psi @ 400° F	Bronze	00000000	00000
1/2	200 psi @ 72° F	125 psi @ 400° F	Bronze	00000000	00000
3/4	200 psi @ 72° F	125 psi @ 400° F	Bronze	00000000	00000
1	200 psi @ 72° F	125 psi @ 400° F	Bronze	00000000	00000
1 1/4	200 psi @ 72° F	125 psi @ 400° F	Bronze	00000000	00000
1 1/2	200 psi @ 72° F	125 psi @ 400° F	Bronze	00000000	000000
2	200 psi @ 72° F	125 psi @ 400° F	Bronze	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	00000
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

Bronze Unthreaded Pipe Fittings

Snap a brazing ring (sold separately) into these fittings and braze them to unthreaded pipe for a strong, leak-resistant connection. Fittings are also known as Silbraze fittings. They are bronze, which is compatible with brass and has good corrosion resistance.

Union connectors separate into three pieces so you can access your line.

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

Union Straight Connectors

Exploded View

For Use With: Air, Oil, Steam, Water, Natural Gas
Specifications Met: MIL-F-1183
Pipe Nipples and Pipe: Use Schedule 40 brass

Fittings					Brazing Rings
Pipe Size	Max. Pressure	Max. Steam Pressure		Each		Each
1/2	200 psi @ 72° F	200 psi @ 425° F	0000000	000000	0000000	00000
3/4	200 psi @ 72° F	200 psi @ 425° F	0000000	00000	0000000	0000
1	200 psi @ 72° F	200 psi @ 425° F	0000000	000000	0000000	0000
1 1/2	200 psi @ 72° F	200 psi @ 425° F	0000000	000000	0000000	0000
2	200 psi @ 72° F	200 psi @ 425° F	0000000	000000	0000000	0000

Thick-Wall Plastic Pipe Fittings for Water

Connect these fittings to Schedule 80 pipe–they have thicker, stronger walls than standard-wall fittings so they can handle heavy duty industrial plumbing and water supply applications, such as water processing, waste water treatment, and irrigation. Fittings are plastic for good corrosion resistance. They meet ASTM specifications and testing requirements for material quality.

Fittings for drinking water meet NSF/ANSI Standard 61.

Attach socket-connect ends to unthreaded pipe or another socket-connect fitting with a PVC primer and cement (also known as solvent weld).

To prevent leaks in threaded connections, apply a sealant to the male threads. For plastic threads, apply a non-hardening, plastic-compatible sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic connections. For metal threads, use PTFE tape. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.

Note: For fittings that are not rated for pressure, you can use the pressure rating of the plastic pipe as a reference. Threaded fittings are limited to 50% of the rated pressure of the pipe.

Warning: Never use plastic pipe fittings and pipe with compressed air or gas.

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

Union Straight Adapters with Collar, Female Socket Connect × Female Threaded Pipe

Front

Back

For Use With: Water
Maximum Temperature: 140° F
Specifications Met: ASTM D1784
Pipe Nipples and Pipe: Use Schedule 80 Brass, Copper, PVC Plastic
Flanges: Use Class 150 PVC Plastic

Fittings with stainless steel collar have a reinforcement on the female threads to prevent the threads from cracking.

Fittings with metal threads allow you to transition to a brass, copper, or stainless steel pipe or fitting.

Unions separate into three pieces so you can access your line.

NPT Threads
Pipe Size	Socket Depth	Material	Collar Material	Threaded Insert Material	O-Ring Material	Color		Each
1/2	7/8"	PVC Plastic	Stainless Steel	Brass	EPDM Rubber	Dark Gray	00000000	000000
3/4	1"	PVC Plastic	Stainless Steel	Brass	EPDM Rubber	Dark Gray	00000000	000000
1	1 1/8"	PVC Plastic	Stainless Steel	Brass	EPDM Rubber	Dark Gray	00000000	000000
1 1/4	1 1/4"	PVC Plastic	Stainless Steel	Brass	EPDM Rubber	Dark Gray	00000000	000000
1 1/2	1 3/8"	PVC Plastic	Stainless Steel	Brass	EPDM Rubber	Dark Gray	00000000	000000
2	1 1/2"	PVC Plastic	Stainless Steel	Brass	EPDM Rubber	Dark Gray	00000000	000000

Standard-Wall Plastic Pipe Fittings for Water

Connect these fittings to Schedule 40 plastic pipe–they are the industry standard for residential and commercial low-pressure plumbing and water supply applications. They are plastic for good corrosion resistance.

Attach socket-connect ends to unthreaded pipe or another socket-connect fitting with a PVC primer and cement (also known as solvent weld).

To prevent leaks in threaded connections, apply a sealant to the male threads. For metal threads, use PTFE tape. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.

Fittings that meet ASTM D1784, ASTM D1785, and ASTM D4066 adhere to specifications and testing requirements for material quality.

Note: For fittings that are not rated for pressure, you can use the pressure rating of the plastic pipe as a reference. Threaded fittings are limited to 50% of the rated pressure of the pipe.

Warning: Never use plastic pipe fittings and pipe with compressed air or gas.

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

Union Straight Adapters, Female Socket Connect × Female Threaded Pipe

Front

Back

For Use With: Water
Maximum Temperature: 140° F
Specifications Met: ASTM D1784
Pipe Nipples and Pipe: Use Schedule 40 Brass, PVC Plastic
Flanges: Use Schedule 40 PVC Plastic

Fittings with stainless steel collar have a reinforcement on the female threads to prevent the threads from cracking.

Fittings with metal threads allow you to transition to a brass or bronze pipe or fitting.

Unions separate into three pieces so you can access your line.

NPT Threads
Pipe Size	Socket Depth	Material	Collar Material	Threaded Insert Material	O-Ring Material	Color		Each
1	1 7/64"	PVC Plastic	Stainless Steel	Brass	Buna-N Rubber	White	00000000	0000000
1 1/4	1 13/64"	PVC Plastic	Stainless Steel	Brass	Buna-N Rubber	White	00000000	000000
1 1/2	1 25/64"	PVC Plastic	Stainless Steel	Brass	Buna-N Rubber	White	00000000	000000
2	1 15/32"	PVC Plastic	Stainless Steel	Brass	Buna-N Rubber	White	00000000	000000