Class 125 Unions | McMaster-Carr

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125 psi @ 400° F

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26 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. 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	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

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	000000