Aluminum Pipe Unions | McMaster-Carr

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	Material Material

356 Aluminum

6061 Aluminum

Aluminum

	For Pipe Material For Pipe Material

Aluminum

	Pipe Size Pipe Size

	Thread Type Thread Type

NPT

UNF

	Type Type


Union	Connector

Rotating Joint

	Shape Shape


Straight	90° Elbow

	System of Measurement System of Measurement

Inch

	Length Length

	For Use With For Use With

	For Pipe Schedule For Pipe Schedule


40	80

	Connection Type Connection Type

	Pipe

	Gender Gender

Female

Male

	Maximum Pressure Maximum Pressure

150 psi @ 72° F

1,500 psi @ 72° F

	Body Shape Body Shape

	Hex

	Connection Style Connection Style

Threaded

	Pressure Class Pressure Class

150

3000

	DFARS (Defense Acquisition Regulations Supplement) DFARS (Defense Acquisition Regulations Supplement)

DFARS Specialty Metals
COTS-Exempt

	Hex Width Hex Width

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

REACH Compliant

	RoHS (Restriction of Hazardous Substances) RoHS (Restriction of Hazardous Substances)

RoHS Compliant

	Connection Connection

Rotating

Stationary

	Thread Size Thread Size

	Maximum Speed Maximum Speed

1,500 rpm

3,500 rpm

	Thread Direction Thread Direction

Right Hand

Forward

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26 Products

About Rotating Joints

Rotating joints transfer hot and cold materials from your supply line to a continuously revolving drum, roller, or other rotating equipment.

Pipe size is an industry designation, not the actual size. View information about how to measure pipe size threads.

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 Aluminum Threaded Pipe Fittings

In addition to being lightweight, these aluminum fittings offer good corrosion resistance. Use them in low-pressure flow applications. To prevent cracking, do not tighten more than a 1/4-turn past hand tight.

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, Oil, Water
Pipe Nipples and Pipe: Use Schedule 40 aluminum
Flanges: Use Class 125 aluminum

NPT Female
Pressure Class	Pipe Size	Max. Pressure		Each
150	1/4	150 psi @ 72° F	000000000	000000
150	3/8	150 psi @ 72° F	000000000	00000
150	1/2	150 psi @ 72° F	000000000	00000
150	3/4	150 psi @ 72° F	000000000	00000
150	1	150 psi @ 72° F	000000000	00000
150	1 1/4	150 psi @ 72° F	000000000	00000
150	1 1/2	150 psi @ 72° F	000000000	00000
150	2	150 psi @ 72° F	000000000	00000
150	2 1/2	150 psi @ 72° F	000000000	000000
150	3	150 psi @ 72° F	000000000	000000

High-Pressure Aluminum Threaded Pipe Fittings

Also known as Pressure Class 3000 fittings, these have the highest pressure rating of all the aluminum pipe fittings we offer. They are lightweight with 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, Water
Pressure Class : 3000
Specifications Met: Fed. Spec. QQ-A-200/8, ASTM B221, ASME B1.20.1
Pipe Nipples and Pipe: Use Schedule 80 aluminum

NPT Female
Pipe Size	Max. Pressure		Each
1/4	1,500 psi @ 72° F	00000000	0000000
1/2	1,500 psi @ 72° F	00000000	000000
3/4	1,500 psi @ 72° F	00000000	000000
1	1,500 psi @ 72° F	00000000	000000

Aluminum One-Way-Flow Rotating Joints

For Use With: Air, Hydraulic Oil
Temperature Range: -20° to 250° F
Maximum Pressure:
Air: 150 psi @ 72° F
Oil: See table
Maximum Vacuum: 28 in. of Hg @ 72° F

These joints have a rotating shaft with threads on one end that connect to a continuously revolving drum, roller, or other rotating equipment. Use them to transfer hot and cold materials from your supply line. Joints are for one-way flow and are meant to be used in pairs—one joint serves as the supply line while the other serves as the return line. Joints are made of lightweight aluminum. They are a compact size for use in small air and hydraulic applications.

If your drum rotates counterclockwise as you face the connecting end, you should select a rotating joint with right-handed threads.

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

Rotating Threads				Stationary Threads
Pipe Size	Thread Size	Thread Type	Gender	Pipe Size	Thread Type	Gender	Max. Speed, rpm	Body Dia.	Lg.	Max. Oil Pressure	Shaft Material		Each
Right-Hand Rotating Threads
1/8	__	NPT	Male	1/8	NPT	Female	1,500	1 1/8"	2 13/16"	1,000 psi @ 72° F	Steel	0000000	0000000
1/4	__	NPT	Male	1/4	NPT	Female	1,500	1 5/8"	3 3/16"	1,000 psi @ 72° F	Steel	0000000	000000
3/8	__	NPT	Male	3/8	NPT	Female	1,500	1 11/16"	3 15/16"	500 psi @ 72° F	Stainless Steel	0000000	000000
1/2	__	NPT	Male	1/2	NPT	Female	1,500	2 1/4"	4 9/16"	750 psi @ 72° F	Stainless Steel	0000000	000000
3/4	__	NPT	Male	3/4	NPT	Female	1,500	2 7/8"	5 1/8"	1,000 psi @ 72° F	Stainless Steel	0000000	000000
1	__	NPT	Male	1	NPT	Female	1,500	3 1/4"	6 3/16"	1,000 psi @ 72° F	Stainless Steel	0000000	000000
1 1/2	__	NPT	Male	1 1/2	NPT	Female	1,500	4 1/4"	7 3/4"	750 psi @ 72° F	Stainless Steel	0000000	000000
__	3/8"-24	UNF	Male	1/8	NPT	Female	3,500	1 1/8"	2 13/16"	1,000 psi @ 72° F	Steel	0000000	000000
__	5/8"-18	UNF	Male	1/4	NPT	Female	3,500	1 5/8"	3 3/16"	1,000 psi @ 72° F	Steel	0000000	000000
__	5/8"-18	UNF	Male	3/8	NPT	Female	3,500	1 11/16"	3 15/16"	500 psi @ 72° F	Stainless Steel	0000000	000000
__	3/4"-16	UNF	Male	1/2	NPT	Female	3,500	2 1/4"	4 7/16"	750 psi @ 72° F	Stainless Steel	0000000	000000
__	1"-14	UNF	Male	3/4	NPT	Female	3,500	2 7/8"	5"	1,000 psi @ 72° F	Stainless Steel	0000000	000000