Bronze Unions | McMaster-Carr

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52 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.

Low-Pressure Brass and Bronze Threaded Pipe Fittings

Use these fittings in low-pressure flow applications. They have good corrosion resistance.

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

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

BSPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Body Shape	Material		Each
1/8	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	00000000	000000
1/4	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	00000000	00000
3/8	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	00000000	00000
1/2	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	00000000	00000
3/4	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	00000000	00000
1	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	00000000	00000
1 1/4	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	00000000	00000
1 1/2	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	00000000	000000
2	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	00000000	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.

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	000000	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

Solder-Connect Fittings for Copper Tubing

Temperature Range: 32° to 200° F

Solder these fittings to copper tubing or the tube end of another fitting for a permanent, leak-tight connection. They are also known as sweat fittings. Fittings have good corrosion resistance. To adhere to safety standards for drinking water systems, use fittings that meet NSF/ANSI 61 or EN 1057.

Copper tube size is the accepted designation of the copper tubing industry, not the actual tube OD.

Union Straight Connectors, Female Socket-Connect Tube

For Use With: Drinking Water
Tubing: Use with K, M, L copper
Specifications Met: See table

Union connectors separate into three pieces for easy access to your line.

Copper Tube Size	For Tube OD	Material	Max. Pressure	Specifications Met		Each
2 1/2	2 5/8"	Bronze	300 psi @ 72° F	ASME B16.18, NSF/ANSI 61	00000000	0000000
3	3 1/8"	Bronze	300 psi @ 72° F	ASME B16.18, NSF/ANSI 61	00000000	000000

Press-Connect Fittings for Copper Tubing

For Use With: Drinking Water
Maximum Pressure: Fittings compatible with Viega ProPress or Viega ProPress XL-C: 200 psi @ 72° F
Fittings compatible with Viega Pex or Viega PureFlow Press: 100 psi @ 72° F
Temperature Range: 0° to 250° F
Tubing: Fittings compatible with Viega ProPress or Viega ProPress XL-C: Use with K, M, L copper
Fittings compatible with Viega Pex or Viega PureFlow Press: Use with hard polyethylene plastic
Specifications Met: See table

Crimp these fittings to copper tubing with a crimping tool (sold separately). An O-ring on the inside of the fitting creates a leak-tight connection that doesn’t require heat or soldering. They are comparable to Viega ProPress fittings. Fittings have good corrosion resistance. They meet NSF/ANSI safety standards for use with drinking water systems.

Copper tube size is the accepted designation of the copper tubing industry, not the actual tube OD.

Union Straight Adapters, Female Press-Connect Tube × Male Threaded Pipe

Unions separate into three pieces for easy access to your line.

NPT Threads
Copper Tube Size	For Tube OD	Pipe Size	Lg.	Material	Compatible With	Specifications Met		Each
1/2	5/8"	1/2	2 19/32"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3/4	7/8"	3/4	2 29/32"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1	1 1/8"	1	3 29/64"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1 1/4	1 3/8"	1 1/4	3 33/64"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1 1/2	1 5/8"	1 1/2	4 15/32"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
2	2 1/8"	2	4 9/16"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000

Union Straight Adapters, Female Press-Connect Tube × Female Threaded Pipe

Unions separate into three pieces for easy access to your line.

NPT Threads
Copper Tube Size	For Tube OD	Pipe Size	Lg.	Material	Compatible With	Specifications Met		Each
1/2	5/8"	1/2	2 17/64"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3/4	7/8"	3/4	2 27/64"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1	1 1/8"	1	2 7/8"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1 1/4	1 3/8"	1 1/4	2 31/32"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1 1/2	1 5/8"	1 1/2	3 7/8"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
2	2 1/8"	2	3 59/64"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000

Union Straight Adapters for Galvanized Steel Threaded Pipe, Female Press-Connect Tube × Female Pipe

Unions separate into three pieces for easy access to your line. Union adapters for galvanized steel threaded pipe join copper tubing to galvanized threaded connections on hot water heaters.

NPT Threads
Copper Tube Size	For Tube OD	Pipe Size	Lg.	Material	Compatible With	Specifications Met		Each
1/2	5/8"	1/2	2 15/64"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
3/4	7/8"	3/4	2 9/16"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1	1 1/8"	1	2 9/16"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1 1/4	1 3/8"	1 1/4	2 11/16"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1 1/2	1 5/8"	1 1/2	3 7/64"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
2	2 1/8"	2	3 17/32"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000

Union Straight Connectors, Female Press-Connect Tube

Unions separate into three pieces for easy access to your line.

Copper Tube Size	For Tube OD	Lg.	Material	Compatible With	Specifications Met		Each
1/2	5/8"	2 27/32"	Bronze	Viega ProPress	ASME B16.51, NSF/ANSI 61, UL 213	0000000	000000
3/4	7/8"	3 5/32"	Bronze	Viega ProPress	ASME B16.51, NSF/ANSI 61, UL 213	0000000	00000
1	1 1/8"	3 41/64"	Bronze	Viega ProPress	ASME B16.51, NSF/ANSI 61, UL 213	0000000	00000
1 1/4	1 3/8"	3 11/16"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	00000
1 1/2	1 5/8"	4 61/64"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000
2	2 1/8"	5 7/32"	Bronze	Viega ProPress	ASME B16.51, ASME B31.1, ASME B31.3, ASME B31.9, NSF/ANSI 61, UL 213	00000000	000000

Replacement O-Rings

For Copper Tube Size	For Tube OD	O-Ring Material	Compatible With		Each
1/2	5/8"	EPDM Rubber	Viega ProPress	0000000	00000
3/4	7/8"	EPDM Rubber	Viega ProPress	0000000	0000
1	1 1/8"	EPDM Rubber	Viega ProPress	0000000	0000
1 1/4	1 3/8"	EPDM Rubber	Viega ProPress	00000000	0000
1 1/2	1 5/8"	EPDM Rubber	Viega ProPress	00000000	0000
2	2 1/8"	EPDM Rubber	Viega ProPress	00000000	0000

Crimping Tools with Six Jaws

Jaws for copper tube sizes ½ to 2 fit directly into the included crimping tool.

			Battery
For Copper Tube Size	For Tube OD	Voltage	No. Included	Cap., amp-hrs.	Battery Charger Included	Battery Charging Time, min.	Compatible With	Specifications Met		Each
1/2, 3/4, 1, 1 1/4, 1 1/2, 2	5/8", 7/8", 1 1/8", 1 3/8", 1 5/8", 2 1/8"	18V DC	2	3	Yes	39	Viega ProPress	EMC 2011/65/EU, EMC 2014/30/EU, IEC 62841-1, UL 62841-1	00000000	000000000