Junction Block Joints | McMaster-Carr

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	Material Material

Aluminum

Stainless Steel

	Pipe Size Pipe Size

1/8

1/4

3/8

	Thread Type Thread Type

	Shape Shape	Show

	Junction Block

	Shape Shape	Hide


Straight	Round

90° Elbow	Tee

Cross	Z

Adjustable- Angle Elbow	Cap/Plug

45° Elbow	Manifold

Wye	270° Bend

Cut-to-Angle Elbow	Junction Block

Side-Outlet Elbow	11 1/4° Elbow

22 1/2° Elbow	30° Elbow

180° Bend	Cap

Double 90° Elbow	Double Wye

Round Tube

	Number of Outlets Number of Outlets

	Number of Inlets Number of Inlets

	Flow Pattern Flow Pattern

	Straight

	For Use With For Use With

Air

Hydraulic Fluid

Water

	System of Measurement System of Measurement

Inch

Metric

	Outlet Center-to-Center Outlet Center-to-Center

	Maximum Pressure Maximum Pressure

1,000 psi @ 72° F

3,000 psi @ 72° F

3,500 psi @ 72° F

	Outlet Location Outlet Location

	One Side

	Width Width

	Length Length

	Height Height

	Type Type

	Connector

	Connection Style Connection Style

Threaded

	For Screw Size For Screw Size

No. 8

No. 12

	Maximum Temperature Maximum Temperature

100° to 249° F

500° to 999° F

	Maximum Vacuum Maximum Vacuum

29 in. of Hg @ 72° F

Not Rated

	Mount Type Mount Type

Screw

	Mounting Hardware Included Mounting Hardware Included

	Outlet Spacing Outlet Spacing

41 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.

How to Measure Threaded Pipe Size

Use these junction blocks to organize and separate multiple lines in your system. They have threaded holes that allow air, water, or hydraulic fluid to flow straight through the block. They have mounting holes, so you can mount from the side.

Anodized aluminum junction blocks are lightweight with good corrosion and wear resistance.

316 stainless steel junction blocks have excellent corrosion resistance and can handle fuel, gasoline, coolant, and other harsh substances.

Use a plug (sold separately) to close off any unused inlets and outlets.

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

Anodized Aluminum—NPT Inlets × NPT Outlets

For Use With: Air, Water, Hydraulic Fluid
Temperature Range: -10° to 200° F
Maximum Pressure:
Air: 1,000 psi @ 72° F
Water: 1,000 psi @ 72° F
Hydraulic Fluid: 3,000 psi @ 72° F
Maximum Vacuum: 29 in. of Hg @ 72° F

	Inlet		Outlet
No. of Outlets	Pipe Size	Dash Size	Pipe Size	Dash Size	Lg.	Wd.	Ht.	Outlet Ctr.-to-Ctr.	Outlet Spacing	Color		Each
4	1/8	02	1/8	02	4 3/4"	3/4"	1"	3/4"	Standard	Black	0000000	000000
4	1/4	04	1/4	04	5 3/8"	1"	1"	7/8"	Standard	Black	0000000	00000
6	1/8	02	1/8	02	6 1/4"	3/4"	1"	3/4"	Standard	Black	0000000	00000
6	1/4	04	1/4	04	7 1/8"	1"	1"	7/8"	Standard	Black	0000000	00000
8	1/8	02	1/8	02	7 3/4"	3/4"	1"	3/4"	Standard	Black	0000000	00000
8	1/4	04	1/4	04	8 7/8"	1"	1"	7/8"	Standard	Black	0000000	00000
10	1/8	02	1/8	02	9 1/4"	3/4"	1"	3/4"	Standard	Black	0000000	00000
10	1/4	04	1/4	04	10 5/8"	1"	1"	7/8"	Standard	Black	0000000	00000

Anodized Aluminum—Metric Inlets × Metric Outlets

For Use With: Air, Water, Hydraulic Fluid
Temperature Range: -10° to 200° F
Maximum Pressure:
Air: 1,000 psi @ 72° F
Water: 1,000 psi @ 72° F
Hydraulic Fluid: 3,000 psi @ 72° F
Maximum Vacuum: Not Rated

	Inlet		Outlet
No. of Outlets	Thread Size	Thread Pitch, mm	Thread Size	Thread Pitch, mm	Lg., mm	Wd., mm	Ht., mm	Outlet Ctr.-to-Ctr., mm	Outlet Spacing	Color		Each
4	M6	1	M6	1	102	19	19	16	Standard	Black	00000000	000000
4	M8	1.25	M8	1.25	127	19	19	16	Standard	Black	00000000	00000
4	M10	1.25	M10	1.25	127	19	19	25	Standard	Black	00000000	00000
4	M12	1.25	M12	1.25	178	38	38	25	Standard	Black	00000000	00000

Anodized Aluminum—BSPT Inlets × BSPT Outlets

For Use With: Air, Water, Hydraulic Fluid
Temperature Range: -10° to 200° F
Maximum Pressure:
Air: 1,000 psi @ 72° F
Water: 1,000 psi @ 72° F
Hydraulic Fluid: 3,000 psi @ 72° F
Maximum Vacuum: Not Rated

	Inlet		Outlet
No. of Outlets	Pipe Size	Dash Size	Pipe Size	Dash Size	Lg.	Wd.	Ht.	Outlet Ctr.-to-Ctr.	Outlet Spacing	Color		Each
4	1/8	02	1/8	02	4 3/4"	1"	1"	3/4"	Standard	Black	00000000	000000
4	1/4	04	1/4	04	5 3/8"	1"	1"	7/8"	Standard	Black	00000000	00000
4	3/8	06	3/8	06	7 3/4"	1 1/2"	1 1/2"	1 1/2"	Standard	Black	00000000	00000

Anodized Aluminum—BSPP Inlets × BSPP Outlets

For Use With: Air, Water, Hydraulic Fluid
Temperature Range: -10° to 200° F
Maximum Pressure:
Air: 1,000 psi @ 72° F
Water: 1,000 psi @ 72° F
Hydraulic Fluid: 3,000 psi @ 72° F
Maximum Vacuum: Not Rated

	Inlet		Outlet
No. of Outlets	Pipe Size	Dash Size	Pipe Size	Dash Size	Lg.	Wd.	Ht.	Outlet Ctr.-to-Ctr.	Outlet Spacing	Color		Each
4	1/8	02	1/8	02	4 3/4"	1"	1"	3/4"	Standard	Black	00000000	000000
4	1/4	04	1/4	04	5 3/8"	1"	1"	7/8"	Standard	Black	00000000	00000
4	3/8	06	3/8	06	7 3/4"	1 1/2"	1 1/2"	1 1/2"	Standard	Black	00000000	00000

Anodized Aluminum—UN/UNF (SAE) Inlets × UN/UNF (SAE) Outlets

For Use With: Air, Water, Hydraulic Fluid
Temperature Range: -10° to 200° F
Maximum Pressure:
Air: 1,000 psi @ 72° F
Water: 1,000 psi @ 72° F
Hydraulic Fluid: 3,000 psi @ 72° F
Maximum Vacuum: 29 in. of Hg @ 72° F

No. of Outlets	Inlet Thread Size	Outlet Thread Size	Lg.	Wd.	Ht.	Outlet Ctr.-to-Ctr.	Outlet Spacing	Color		Each
4	10-32	10-32	3"	5/8"	5/8"	1/2"	Standard	Black	0000000	000000
6	10-32	10-32	4"	5/8"	5/8"	1/2"	Standard	Black	0000000	00000
8	10-32	10-32	5"	5/8"	5/8"	1/2"	Standard	Black	0000000	00000
10	10-32	10-32	6"	5/8"	5/8"	1/2"	Standard	Black	0000000	00000

316 Stainless Steel—NPT Inlets × NPT Outlets

For Use With: Air, Water, Hydraulic Fluid
Temperature Range: -100° to 500° F
Maximum Pressure:
Air: 1,000 psi @ 72° F
Water: 3,500 psi @ 72° F
Hydraulic Fluid: 3,500 psi @ 72° F
Maximum Vacuum: Not Rated

	Inlet		Outlet
No. of Outlets	Pipe Size	Dash Size	Pipe Size	Dash Size	Lg.	Wd.	Ht.	Outlet Ctr.-to-Ctr.	Outlet Spacing		Each
2	1/8	02	1/8	02	3 1/4"	1"	1"	3/4"	Standard	00000000	0000000
2	1/4	04	1/4	04	3 5/8"	1"	2"	7/8"	Standard	00000000	000000
4	1/8	02	1/8	02	4 3/4"	1"	1"	3/4"	Standard	00000000	000000
4	1/4	04	1/4	04	5 3/8"	1"	1"	7/8"	Standard	00000000	000000
4	3/8	06	3/8	06	7 3/4"	1 1/2"	1 1/2"	1 1/2"	Standard	00000000	000000

316 Stainless Steel—Metric Inlets × Metric Outlets

For Use With: Air, Water, Hydraulic Fluid
Temperature Range: -100° to 500° F
Maximum Pressure:
Air: 1,000 psi @ 72° F
Water: 3,500 psi @ 72° F
Hydraulic Fluid: 3,500 psi @ 72° F
Maximum Vacuum: Not Rated

	Inlet		Outlet
No. of Outlets	Thread Size	Thread Pitch, mm	Thread Size	Thread Pitch, mm	Lg., mm	Wd., mm	Ht., mm	Outlet Ctr.-to-Ctr., mm	Outlet Spacing		Each
4	M6	1	M6	1	102	19	19	16	Standard	00000000	000000
4	M8	1.25	M8	1.25	127	19	19	16	Standard	00000000	000000
4	M10	1.25	M10	1.25	127	19	19	25	Standard	00000000	000000
4	M12	1.25	M12	1.25	178	38	38	25	Standard	00000000	000000

316 Stainless Steel—BSPT Inlets × BSPT Outlets

For Use With: Air, Water, Hydraulic Fluid
Temperature Range: -100° to 500° F
Maximum Pressure:
Air: 1,000 psi @ 72° F
Water: 3,500 psi @ 72° F
Hydraulic Fluid: 3,500 psi @ 72° F
Maximum Vacuum: Not Rated

	Inlet		Outlet
No. of Outlets	Pipe Size	Dash Size	Pipe Size	Dash Size	Lg.	Wd.	Ht.	Outlet Ctr.-to-Ctr.	Outlet Spacing		Each
4	1/8	02	1/8	02	4 3/4"	1"	1"	3/4"	Standard	00000000	0000000
4	1/4	04	1/4	04	5 3/8"	1"	1"	7/8"	Standard	00000000	000000
4	3/8	06	3/8	06	7 3/4"	1 1/2"	1 1/2"	1 1/2"	Standard	00000000	000000

316 Stainless Steel—BSPP Inlets × BSPP Outlets

For Use With: Air, Water, Hydraulic Fluid
Temperature Range: -100° to 500° F
Maximum Pressure:
Air: 1,000 psi @ 72° F
Water: 3,500 psi @ 72° F
Hydraulic Fluid: 3,500 psi @ 72° F
Maximum Vacuum: Not Rated

	Inlet		Outlet
No. of Outlets	Pipe Size	Dash Size	Pipe Size	Dash Size	Lg.	Wd.	Ht.	Outlet Ctr.-to-Ctr.	Outlet Spacing		Each
4	1/8	02	1/8	02	4 3/4"	1"	1"	3/4"	Standard	00000000	0000000
4	1/4	04	1/4	04	5 3/8"	1"	1"	7/8"	Standard	00000000	000000
4	3/8	06	3/8	06	7 3/4"	1 1/2"	1 1/2"	1 1/2"	Standard	00000000	000000

Plugs for Anodized Aluminum Blocks

		Hex Drive		External Square Drive
Pipe Size	Max. Pressure		Each		Each
Aluminum—NPT
1/8	150 psi @ 72° F	00000000	00000	000000000	00000
1/4	150 psi @ 72° F	00000000	0000	000000000	0000

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Straight-Flow Junction Blocks