Class 125 Unions | McMaster-Carr

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26 Products

About Pipe and Fittings

Measure your pipe and fittings to identify their pipe size, thread size, schedule, and thread type. Then, find compatible components.

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.

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: See table
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	Body Shape	Material	Specifications Met		Each
1/8	200 psi @ 72° F	__	Hex	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	4429K211	000000
1/4	200 psi @ 72° F	__	Octagon	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K212	00000
3/8	200 psi @ 72° F	__	Octagon	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K213	00000
1/2	200 psi @ 72° F	__	Octagon	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K214	00000
3/4	200 psi @ 72° F	__	Octagon	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K215	00000
1	200 psi @ 72° F	__	Octagon	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K216	00000
1 1/4	200 psi @ 72° F	__	Octagon	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K217	000000
1 1/2	200 psi @ 72° F	__	Octagon	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K218	000000
2	200 psi @ 72° F	__	Octagon	Brass	ASME B1.20.1, ASME B16.15, NSF/ANSI 61	4429K219	000000
2 1/2	200 psi @ 72° F	__	Hex	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	4429K221	000000
3	200 psi @ 72° F	__	Hex	Brass	ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61	4429K222	000000
BSPT Female
1/8	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	ASME BS21, ASTM B584	4978K161	00000
1/4	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	ASME BS21, ASTM B584	4978K162	00000
3/8	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	ASME BS21, ASTM B584	4978K163	00000
1/2	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	ASME BS21, ASTM B584	4978K164	00000
3/4	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	ASME BS21, ASTM B584	4978K165	00000
1	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	ASME BS21, ASTM B584	4978K166	00000
1 1/4	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	ASME BS21, ASTM B584	4978K167	00000
1 1/2	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	ASME BS21, ASTM B584	4978K168	00000
2	200 psi @ 72° F	125 psi @ 400° F	Hex	Bronze	ASME BS21, ASTM B584	4978K169	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.

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	9162K471	000000
1/4	200 psi @ 72° F	125 psi @ 400° F	9162K472	00000
3/8	200 psi @ 72° F	125 psi @ 400° F	9162K473	00000
1/2	200 psi @ 72° F	125 psi @ 400° F	9162K474	00000
3/4	200 psi @ 72° F	125 psi @ 400° F	9162K475	00000
1	200 psi @ 72° F	125 psi @ 400° F	9162K476	000000