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How to Measure Threaded Pipe Size
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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.
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Right-Angle Flow Rectangular Manifolds
Distribute air or fluid to multiple locations from a single supply source with these manifolds. They are also known as headers. They have mounting holes, so you can mount from the top or side.
Aluminum manifolds are the industry standard for the most common types of applications. They are lighter in weight than other metal manifolds and have good corrosion resistance. Anodized aluminum manifolds have a black finish and nickel-plated aluminum manifolds have a shiny finish.
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.
- 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
- 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
Inlet | Outlet | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| No. of Outlets | Thread Size  | Dash Size | Thread Size | Dash Size | Lg. | Wd. | Ht. | Outlet Ctr.-to-Ctr. | Each | |
Outlets on One Side—Standard Outlet Spacing | ||||||||||
| 2 | 3/4"-16 | 08 | 9/16"-18 | 06 | 5" | 1 3/4" | 1 3/4" | 2" | 0000000 | 000000 |
| 3 | 9/16"-18 | 06 | 7/16"-20 | 04 | 5 5/8" | 1 3/4" | 1 3/4" | 1 3/4" | 0000000 | 00000 |
| 3 | 3/4"-16 | 08 | 9/16"-18 | 06 | 7" | 1 3/4" | 1 3/4" | 2" | 0000000 | 00000 |
| 4 | 9/16"-18 | 06 | 7/16"-20 | 04 | 7 3/8" | 1 3/4" | 1 3/4" | 1 3/4" | 0000000 | 00000 |
| 4 | 3/4"-16 | 08 | 9/16"-18 | 06 | 9" | 1 3/4" | 1 3/4" | 2" | 0000000 | 00000 |
| 6 | 3/4"-16 | 08 | 9/16"-18 | 06 | 13" | 1 3/4" | 1 3/4" | 2" | 0000000 | 00000 |
| 10 | 3/4"-16 | 08 | 9/16"-18 | 06 | 21" | 1 3/4" | 1 3/4" | 2" | 0000000 | 000000 |
| Pipe Size | Thread Size | Drive | Max. Pressure | Each | |
Aluminum—NPT | |||||
|---|---|---|---|---|---|
| 1/8 | __ | Hex | 150 psi @ 72° F | 00000000 | 00000 |
| 1/8 | __ | External Square | 150 psi @ 72° F | 000000000 | 0000 |
Aluminum—UNF | |||||
| __ | 10-32 | External Hex | 150 psi @ 72° F | 00000000 | 0000 |
| __ | 3/4"-16 | External Hex | 150 psi @ 72° F | 00000000 | 0000 |
| __ | 7/16"-20 | External Hex | 150 psi @ 72° F | 00000000 | 0000 |
| __ | 9/16"-18 | External Hex | 150 psi @ 72° F | 00000000 | 0000 |
Straight-Flow Rectangular Manifolds
Unlike other manifolds, which have an inlet on either end, these have one inlet on the opposite side from the outlets. This design allows fluid or air to follow a straight path, improving flow through your system. It also frees up the ends of the manifold, so you can mount it in corners and in narrow spaces. Manifolds are also known as headers. They have mounting holes, so you can mount from the top or side.
Anodized aluminum manifolds are the industry standard for the most common types of applications. They are lighter in weight than other metal manifolds and have good corrosion resistance. These manifolds are anodized for a black finish.
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.
- 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
Inlet | Outlet | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| No. of Outlets | Thread Size | Dash Size | Thread Size | Dash Size | Lg. | Wd. | Ht. | Outlet Ctr.-to-Ctr. | Color | Each | |
Standard Outlet Spacing | |||||||||||
| 2 | 9/16"-18 | 6 | 7/16"-20 | 4 | 2 1/8" | 1 1/4" | 1 1/4" | 7/8" | Black | 00000000 | 000000 |
| 2 | 1 1/16"-12 | 12 | 3/4"-16 | 8 | 4" | 2" | 2" | 1 1/2" | Black | 00000000 | 00000 |
| 3 | 1 1/16"-12 | 12 | 3/4"-16 | 8 | 5 1/2" | 2" | 2" | 1 1/2" | Black | 00000000 | 00000 |
| 3 | 1 5/16"-12 | 16 | 1 1/16"-12 | 12 | 7" | 2 1/2" | 2 1/2" | 2" | Black | 00000000 | 000000 |
| 4 | 9/16"-18 | 6 | 7/16"-20 | 4 | 3 7/8" | 1 1/4" | 1 1/4" | 7/8" | Black | 00000000 | 00000 |
| 4 | 3/4"-16 | 8 | 9/16"-18 | 6 | 4 3/4" | 1 1/2" | 1 1/2" | 1" | Black | 00000000 | 00000 |
| 4 | 1 1/16"-12 | 12 | 3/4"-16 | 8 | 7" | 2" | 2" | 1 1/2" | Black | 00000000 | 00000 |
| 6 | 9/16"-18 | 6 | 7/16"-20 | 4 | 5 5/8" | 1 1/4" | 1 1/4" | 7/8" | Black | 00000000 | 00000 |
| 6 | 1 5/16"-12 | 16 | 1 1/16"-12 | 12 | 13" | 2 1/2" | 2 1/2" | 2" | Black | 00000000 | 000000 |
| 8 | 7/16"-20 | 4 | 5/16"-24 | 2 | 6 1/4" | 1" | 1" | 3/4" | Black | 00000000 | 00000 |
| 8 | 9/16"-18 | 6 | 7/16"-20 | 4 | 7 3/8" | 1 1/4" | 1 1/4" | 7/8" | Black | 00000000 | 00000 |
Low-Profile Square Manifolds
With outlets on the side instead of on top, these manifolds have a lower profile than rectangular manifolds and fit well in cramped spaces. Use them to distribute air, water, or hydraulic fluid to three locations from a single supply source. Manifolds have mounting holes, so you can mount from the top.
Anodized aluminum manifolds are the industry standard for the most common types of applications. They are lighter in weight than other metal manifolds and have good corrosion resistance. These manifolds are anodized for a black finish.
316 stainless steel manifolds 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.
- For Use With: Air, Water, Hydraulic Fluid
- Temperature Range: -10° to 200° F
- Maximum Pressure: 1,000 psi @ 72° F
- Maximum Vacuum: 27 in. of Hg @ 72° F
Inlet | Outlet | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| No. of Outlets | Thread Size | Dash Size | Thread Size | Dash Size | Lg. | Wd. | Ht. | Color | Each | |
| 3 | 7/16"-20 | 04 | 5/16"-24 | 02 | 1 1/2" | 1 1/2" | 3/4" | Black | 0000000 | 000000 |
| 3 | 9/16"-18 | 06 | 7/16"-20 | 04 | 1 1/2" | 1 1/2" | 3/4" | Black | 0000000 | 00000 |
| 3 | 3/4"-16 | 08 | 9/16"-18 | 06 | 2 1/8" | 2 1/8" | 1" | Black | 0000000 | 00000 |
| 3 | 1 1/16"-12 | 12 | 3/4"-16 | 08 | 2 1/2" | 2 1/2" | 1 1/4" | Black | 0000000 | 00000 |
| 3 | 1 5/16"-12 | 16 | 1 1/16"-12 | 12 | 2 3/4" | 2 3/4" | 1 1/2" | Black | 0000000 | 000000 |
| 3 | 1 5/8"-20 | 20 | 1 5/16"-12 | 16 | 3" | 3" | 1 3/4" | Black | 0000000 | 000000 |
- For Use With: Air, Water, Hydraulic Fluid
- Temperature Range: -100° to 500° F
- Maximum Pressure: 3,500 psi @ 72° F
- Maximum Vacuum: 27 in. of Hg @ 72° F
Inlet | Outlet | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| No. of Outlets | Thread Size | Dash Size | Thread Size | Dash Size | Lg. | Wd. | Ht. | Each | |
| 3 | 7/16"-20 | 04 | 5/16"-24 | 02 | 1 1/2" | 1 1/2" | 3/4" | 0000000 | 0000000 |
| 3 | 9/16"-18 | 06 | 7/16"-20 | 04 | 1 1/2" | 1 1/2" | 3/4" | 0000000 | 000000 |
| 3 | 3/4"-16 | 08 | 9/16"-18 | 06 | 2 1/8" | 2 1/8" | 1" | 0000000 | 000000 |
| 3 | 1 1/16"-12 | 12 | 3/4"-16 | 08 | 2 1/2" | 2 1/2" | 1 1/4" | 0000000 | 000000 |
| 3 | 1 5/16"-12 | 16 | 1 1/16"-12 | 12 | 2 3/4" | 2 3/4" | 1 1/2" | 0000000 | 000000 |
| 3 | 1 5/8"-20 | 20 | 1 5/16"-12 | 16 | 3" | 3" | 1 3/4" | 0000000 | 000000 |
Low-Profile Hex Manifolds
When you’re short on vertical space, these manifolds are a good fit—they have outlets on the side instead of on top, so they have a lower profile than rectangular manifolds. Use them to distribute air, water, or hydraulic fluid to five locations from a single supply source. Manifolds have mounting holes, so you can mount from the top.
Anodized aluminum manifolds are the industry standard for the most common types of applications. They are lighter in weight than other metal manifolds and have good corrosion resistance. These manifolds are anodized for a black finish.
316 stainless steel manifolds 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.
- For Use With: Air, Water, Hydraulic Fluid
- Temperature Range: -10° to 200° F
- Maximum Pressure: 1,000 psi @ 72° F
- Maximum Vacuum: 27 in. of Hg @ 72° F
Inlet | Outlet | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| No. of Outlets | Thread Size | Dash Size | Thread Size | Dash Size | Wd. | Ht. | Outlet Spacing | Color | Each | |
| 5 | 7/16"-20 | 4 | 5/16"-18 | 2 | 1 5/8" | 3/4" | Standard | Black | 00000000 | 000000 |
| 5 | 9/16"-18 | 6 | 7/16"-20 | 4 | 1 7/8" | 3/4" | Standard | Black | 00000000 | 00000 |
| 5 | 3/4"-16 | 8 | 9/16"-18 | 6 | 2" | 1" | Standard | Black | 00000000 | 00000 |
| 5 | 1 1/16"-12 | 12 | 3/4"-16 | 8 | 3" | 1 1/4" | Standard | Black | 00000000 | 00000 |
| 5 | 1 5/16"-12 | 16 | 1 1/16"-12 | 12 | 2 1/2" | 1 1/2" | Standard | Black | 00000000 | 000000 |
| 5 | 1 5/8"-20 | 20 | 1 5/16"-12 | 16 | 4 1/2" | 2 3/4" | Standard | Black | 00000000 | 000000 |
- For Use With: Air, Water, Hydraulic Fluid
- Temperature Range: 100° to 500° F
- Maximum Pressure: 3,500 psi @ 72° F
- Maximum Vacuum: 27 in. of Hg @ 72° F
Inlet | Outlet | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| No. of Outlets | Thread Size | Dash Size | Thread Size | Dash Size | Wd. | Ht. | Outlet Spacing | Each | |
| 5 | 7/16"-20 | 4 | 5/16"-18 | 2 | 1 5/8" | 3/4" | Standard | 00000000 | 0000000 |
| 5 | 9/16"-18 | 6 | 7/16"-20 | 4 | 1 7/8" | 3/4" | Standard | 00000000 | 000000 |
| 5 | 3/4"-16 | 8 | 9/16"-18 | 6 | 2" | 1" | Standard | 00000000 | 000000 |
| 5 | 1 1/16"-12 | 12 | 3/4"-16 | 8 | 3" | 1 1/4" | Standard | 00000000 | 000000 |
| 5 | 1 5/16"-12 | 16 | 1 1/16"-12 | 12 | 2 1/2" | 1 1/2" | Standard | 00000000 | 000000 |
| 5 | 1 5/8"-20 | 20 | 1 5/16"-12 | 16 | 4 1/2" | 2 3/4" | Standard | 00000000 | 000000 |
Miniature Hex Manifolds
A great solution when space is at a premium, these manifolds are less than an inch in height, yet allow you to supply up to 12 lines from one distribution point. Manifolds have a mounting hole, so you can mount from the side. They are brass, which has good corrosion resistance.
Use a plug (sold separately) to close off any unused inlets and outlets.
- For Use With: See table
- Temperature Range: -60° to 250° F
- Maximum Pressure: See table
- Maximum Vacuum: See table
Inlet | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Use With | No. of Outlets | Pipe Size | Dash Size | Outlet Thread Size | Lg. | Wd. | Ht. | Outlet Ctr.-to-Ctr. | Outlet Spacing | Max. Pressure | Max. Vacuum | Each | |
Outlets on Three Sides | |||||||||||||
| Air, Water | 12 | 1/4 | 04 | 10-32 | 3" | 11/16" | 13/16" | 1/2" | Standard | 2,000 psi @ 72° F | 27 in. of Hg @ 72° F | 000000 | 000000 |
| Air, Water, Hydraulic Fluid | 12 | 1/8 | 02 | 10-32 | 2 7/8" | 9/16" | 5/8" | 1/2" | Standard | 250 psi @ 72° F | 28 in. of Hg @ 72° F | 0000000 | 00000 |
Straight-Flow Junction Blocks
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.
For technical drawings and 3-D models, click on a part number.
- 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
NFPA Valve-Mounting Blocks
NFPA valve-mounting blocks have standardized valve mounting patterns to keep hydraulic lines compact and organized.
UN/UNF (SAE) thread connections have straight threads and are also known as O-ring Boss fittings.
For technical drawings and 3-D models, click on a part number.