BSPT 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 Stainless Steel Threaded Pipe Fittings

Use these fittings in a low-pressure pipe line.

Fittings that meet ANSI/MSS SP-114 adhere to high-quality standards for heat treating, material thickness, and marking. 304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent 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, Steam, Water
Pressure Class: 150
Fabrication: Heat Treated
Specifications Met:
NPT: ANSI/MSS SP-114, ASTM A351
BSPP and BSPT: ASNI/MSS SP-114
Pipe Nipples and Pipe: Use Schedule 40 stainless steel
Flanges: Use Class 150 stainless steel

		304 Stainless Steel			316 Stainless Steel
Pipe Size	Max. Steam Pressure	Max. Pressure		Each	Max. Pressure		Each
BSPT Female
1/8	150 psi @ 350° F	300 psi @ 72° F	00000000	000000	150 psi @ 72° F	00000000	000000
1/4	150 psi @ 350° F	300 psi @ 72° F	00000000	00000	150 psi @ 72° F	00000000	00000
3/8	150 psi @ 350° F	300 psi @ 72° F	00000000	00000	150 psi @ 72° F	00000000	00000
1/2	150 psi @ 350° F	300 psi @ 72° F	00000000	00000	150 psi @ 72° F	00000000	00000
3/4	150 psi @ 350° F	300 psi @ 72° F	00000000	00000	150 psi @ 72° F	00000000	00000
1	150 psi @ 350° F	300 psi @ 72° F	00000000	00000	150 psi @ 72° F	00000000	00000
1 1/4	150 psi @ 350° F	150 psi @ 72° F	00000000	00000	150 psi @ 72° F	00000000	00000
1 1/2	150 psi @ 350° F	300 psi @ 72° F	00000000	000000	150 psi @ 72° F	00000000	00000
2	150 psi @ 350° F	300 psi @ 72° F	00000000	000000	150 psi @ 72° F	00000000	000000

Low-Pressure Iron and Steel Threaded Pipe Fittings

Use these fittings for low-pressure applications in noncorrosive environments.

Union connectors separate into three pieces so you can access your line without unthreading pipe connections. They have a gasket that creates a tight seal.

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

Union Straight Connectors

Hex Nut-Exploded View

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 150
Specifications Met: See table
Pipe Nipples and Pipe: Use Schedule 40 steel

BSPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Body Shape	Material	Gasket Material	Specifications Met		Each
1/4	150 psi @ 72° F	150 psi @ 360° F	Hex	Iron	Brass	DIN EN 10226	00000000	000000
3/8	150 psi @ 72° F	150 psi @ 360° F	Hex	Iron	Brass	DIN EN 10226	00000000	00000
1/2	150 psi @ 72° F	150 psi @ 360° F	Hex	Iron	Brass	DIN EN 10226	00000000	00000
3/4	150 psi @ 72° F	150 psi @ 360° F	Hex	Iron	Brass	DIN EN 10226	00000000	00000
1	150 psi @ 72° F	150 psi @ 360° F	Hex	Iron	Brass	DIN EN 10226	00000000	00000
1 1/4	150 psi @ 72° F	150 psi @ 360° F	Hex	Iron	Brass	DIN EN 10226	00000000	00000
1 1/2	150 psi @ 72° F	150 psi @ 360° F	Hex	Iron	Brass	DIN EN 10226	00000000	00000
2	150 psi @ 72° F	150 psi @ 360° F	Hex	Iron	Brass	DIN EN 10226	00000000	00000
2 1/2	150 psi @ 72° F	150 psi @ 360° F	Hex	Iron	Brass	DIN EN 10226	0000000	00000

Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings

The galvanized finish on these fittings provides fair corrosion resistance. Fittings are for use in low-pressure applications.

Union connectors separate so you can access your line without unthreading pipe connections. They have a brass gasket that creates a tight seal.

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

Union Straight Connectors

Exploded View

For Use With: Air, Steam, Oil, Water, Natural Gas
Pressure Class: 150
Specifications Met: See table
Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
Flanges: Use Class 150 galvanized steel

BSPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material	Gasket Material	Specifications Met		Each
1/4	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	Brass	ASTM A197, DIN EN 10226	00000000	000000
3/8	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	Brass	ASTM A197, DIN EN 10226	00000000	00000
1/2	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	Brass	ASTM A197, DIN EN 10226	00000000	00000
3/4	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	Brass	ASTM A197, DIN EN 10226	00000000	00000
1	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	Brass	ASTM A197, DIN EN 10226	00000000	00000
1 1/2	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	Brass	ASTM A197, DIN EN 10226	00000000	00000
2	150 psi @ 72° F	150 psi @ 360° F	Galvanized Iron	Brass	ASTM A197, DIN EN 10226	00000000	00000

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.

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

BSPT Female
Pipe Size	Max. Pressure	Max. Steam Pressure	Material		Each
1/8	200 psi @ 72° F	125 psi @ 400° F	Bronze	00000000	000000
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	000000
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

Thick-Wall Plastic Pipe Fittings for Water

Connect these fittings to Schedule 80 pipe. With thicker, stronger walls than standard-wall fittings, they can handle heavy duty supply applications, such as water processing, wastewater 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 sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic connections. 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

For Use With: Drinking Water, Water
Maximum Temperature: 140° F
Specifications Met: ASTM D1784, NSF/ANSI 61
Pipe Nipples and Pipe: Use Schedule 80 PVC Plastic
Flanges: Use Class 150 PVC Plastic

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

BSPT Threads
Pipe Size	Socket Depth	Material	O-Ring Material	Color		Each
1/2	7/8"	PVC Plastic	EPDM Rubber	Dark Gray	00000000	000000
3/4	1"	PVC Plastic	EPDM Rubber	Dark Gray	00000000	00000
1	7/8"	PVC Plastic	EPDM Rubber	Dark Gray	0000000	00000
1	1 1/8"	PVC Plastic	EPDM Rubber	Dark Gray	00000000	00000
1 1/4	15/16"	PVC Plastic	EPDM Rubber	Dark Gray	0000000	000000
1 1/2	1 3/32"	PVC Plastic	EPDM Rubber	Dark Gray	0000000	000000
1 1/2	1 3/8"	PVC Plastic	EPDM Rubber	Dark Gray	00000000	000000
2	1 5/32"	PVC Plastic	EPDM Rubber	Dark Gray	0000000	000000
2	1 1/2"	PVC Plastic	EPDM Rubber	Dark Gray	00000000	000000