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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About Grease Fitting Threads
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About Precision Flow-Adjustment Valves
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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.
Zinc-plated steel manifolds have the best strength and durability of all our plastic and metal manifolds and can handle the highest pressures. Use them in noncorrosive environments.
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: -60° to 300° F
- Maximum Pressure:
Air: 1,000 psi @ 72° F
Water: 5,000 psi @ 72° F
Hydraulic Fluid: 5,000 psi @ 72° F
Inlet | Outlet | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| No. of Outlets | Pipe Size  | Dash Size | Pipe Size | Dash Size | Lg. | Wd. | Ht. | Outlet Ctr.-to-Ctr. | Each | |
Outlets on One Side—Standard Outlet Spacing | ||||||||||
| 2 | 1/4 | 04 | 1/8 | 02 | 1 3/4" | 1" | 1" | 3/4" | 0000000 | 000000 |
| 2 | 3/8 | 06 | 1/4 | 04 | 2 1/8" | 1 1/4" | 1 1/4" | 1 1/8" | 0000000 | 00000 |
| 2 | 1/2 | 08 | 3/8 | 06 | 2 3/4" | 1 1/2" | 1 1/2" | 1" | 0000000 | 00000 |
| 3 | 1/4 | 04 | 1/8 | 02 | 2 1/2" | 1" | 1" | 3/4" | 0000000 | 00000 |
| 3 | 3/8 | 06 | 1/4 | 04 | 3" | 1 1/4" | 1 1/4" | 7/8" | 0000000 | 00000 |
| 3 | 1/2 | 08 | 3/8 | 06 | 3 3/4" | 1 1/2" | 1 1/2" | 1" | 0000000 | 00000 |
| 4 | 1/4 | 04 | 1/8 | 02 | 3 1/4" | 1" | 1" | 3/4" | 0000000 | 00000 |
| 4 | 3/8 | 06 | 1/4 | 04 | 3 7/8" | 1 1/4" | 1 1/4" | 7/8" | 0000000 | 00000 |
| 4 | 1/2 | 08 | 3/8 | 06 | 4 3/4" | 1 1/2" | 1 1/2" | 1" | 0000000 | 00000 |
| 5 | 1/4 | 04 | 1/8 | 02 | 4" | 1" | 1" | 3/4" | 0000000 | 00000 |
| 5 | 3/8 | 06 | 1/4 | 04 | 4 3/4" | 1 1/4" | 1 1/4" | 7/8" | 0000000 | 00000 |
| 6 | 1/4 | 04 | 1/8 | 02 | 4 3/4" | 1" | 1" | 3/4" | 0000000 | 00000 |
| 6 | 3/8 | 06 | 1/4 | 04 | 5 5/8" | 1 1/4" | 1 1/4" | 7/8" | 0000000 | 00000 |
| 6 | 1/2 | 08 | 3/8 | 06 | 6 3/4" | 1 1/2" | 1 1/2" | 1" | 0000000 | 00000 |
| 8 | 1/4 | 04 | 1/8 | 02 | 6 1/4" | 1" | 1" | 3/4" | 0000000 | 00000 |
| 8 | 3/8 | 06 | 1/4 | 04 | 7 3/8" | 1 1/4" | 1 1/4" | 7/8" | 0000000 | 00000 |
| 8 | 1/2 | 08 | 3/8 | 06 | 8 3/4" | 1 1/2" | 1 1/2" | 1" | 0000000 | 00000 |
| 10 | 1/4 | 04 | 1/8 | 02 | 7 3/4" | 1" | 1" | 3/4" | 0000000 | 00000 |
| 10 | 3/8 | 06 | 1/4 | 04 | 9 1/8" | 1 1/4" | 1 1/4" | 7/8" | 0000000 | 00000 |
| 10 | 1/2 | 08 | 3/8 | 06 | 10 3/4" | 1 1/2" | 1 1/2" | 1" | 0000000 | 00000 |
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.
Zinc-plated steel manifolds have the best strength and durability of all our metal manifolds and can handle the highest pressures. Use them in noncorrosive environments.
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: 5,000 psi @ 72° F
Hydraulic Fluid: 5,000 psi @ 72° F
Inlet | Outlet | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| No. of Outlets | Pipe Size | Dash Size | Pipe Size | Dash Size | Lg. | Wd. | Ht. | Outlet Ctr.-to-Ctr. | Each | |
Standard Outlet Spacing | ||||||||||
| 2 | 1/4 | 4 | 1/8 | 2 | 1 3/4" | 1" | 1" | 3/4" | 00000000 | 000000 |
| 2 | 3/8 | 6 | 1/4 | 4 | 2 1/8" | 1 1/4" | 1 1/4" | 7/8" | 00000000 | 00000 |
| 2 | 1/2 | 8 | 3/8 | 6 | 2 3/4" | 1 1/2" | 1 1/2" | 1" | 00000000 | 00000 |
| 2 | 3/4 | 12 | 1/2 | 8 | 4" | 2" | 2" | 1 1/2" | 00000000 | 00000 |
| 3 | 3/4 | 12 | 1/2 | 8 | 5 1/2" | 2" | 2" | 1 1/2" | 00000000 | 000000 |
| 3 | 1 | 16 | 3/4 | 12 | 7" | 2 1/2" | 2 1/2" | 2" | 00000000 | 000000 |
| 4 | 1/4 | 4 | 1/8 | 2 | 3 1/4" | 1" | 1" | 3/4" | 00000000 | 00000 |
| 4 | 3/8 | 6 | 1/4 | 4 | 3 7/8" | 1 1/4" | 1 1/4" | 7/8" | 00000000 | 00000 |
| 4 | 1/2 | 8 | 3/8 | 6 | 4 3/4" | 1 1/2" | 1 1/2" | 1" | 00000000 | 00000 |
| 4 | 3/4 | 12 | 1/2 | 8 | 7" | 2" | 2" | 1 1/2" | 00000000 | 000000 |
| 4 | 1 | 16 | 3/4 | 12 | 9" | 2 1/2" | 2 1/2" | 2" | 00000000 | 000000 |
| 6 | 1/4 | 4 | 1/8 | 2 | 4 3/4" | 1" | 1" | 3/4" | 00000000 | 00000 |
| 6 | 1/2 | 8 | 3/8 | 6 | 6 3/4" | 1 1/2" | 1 1/2" | 1" | 00000000 | 00000 |
| 6 | 3/4 | 12 | 1/2 | 8 | 10" | 2" | 2" | 1 1/2" | 0000000 | 000000 |
| 8 | 3/8 | 6 | 1/4 | 4 | 7 3/8" | 1 1/4" | 1 1/4" | 7/8" | 00000000 | 00000 |
| 8 | 1/2 | 8 | 3/8 | 6 | 8 3/4" | 1 1/2" | 1 1/2" | 1" | 00000000 | 00000 |
| 8 | 1 | 16 | 3/4 | 12 | 17" | 2 1/2" | 2 1/2" | 2" | 00000000 | 000000 |
Extra-Wide Outlet Spacing | ||||||||||
| 4 | 3/8 | 6 | 1/4 | 4 | 5 3/4" | 1 1/4" | 1 1/4" | 1 1/2" | 00000000 | 00000 |
| 4 | 1/2 | 8 | 3/8 | 6 | 6 1/4" | 1 1/2" | 1 1/2" | 1 1/2" | 00000000 | 00000 |
| 4 | 3/4 | 12 | 1/2 | 8 | 11 1/2" | 2" | 2" | 3" | 00000000 | 000000 |
| 4 | 1 | 16 | 3/4 | 12 | 12" | 2 1/2" | 2 1/2" | 3" | 00000000 | 000000 |
| Pipe Size | Drive | Pressure Class | Max. Pressure | Each | |
Steel—NPT | |||||
|---|---|---|---|---|---|
| 1/8 | Hex | 150 | 150 psi @ 72° F | 000000000 | 00000 |
| 1/8 | Square | 150 | 150 psi @ 72° F | 000000000 | 000 |
| 1/8 | External Square | Not Rated | Not Rated | 000000000 | 000 |
| 1/4 | Hex | 150 | 150 psi @ 72° F | 000000000 | 000 |
| 1/4 | Square | 150 | 150 psi @ 72° F | 000000000 | 000 |
| 1/4 | External Square | Not Rated | Not Rated | 000000000 | 000 |
| 3/8 | Hex | 150 | 150 psi @ 72° F | 000000000 | 000 |
| 3/8 | Square | 150 | 150 psi @ 72° F | 000000000 | 000 |
| 3/8 | External Square | Not Rated | Not Rated | 000000000 | 000 |
| 1/2 | Hex | 150 | 150 psi @ 72° F | 000000000 | 000 |
| 1/2 | Square | 150 | 150 psi @ 72° F | 000000000 | 000 |
| 1/2 | External Square | Not Rated | Not Rated | 000000000 | 000 |
| 3/4 | Hex | 150 | 150 psi @ 72° F | 000000000 | 000 |
| 3/4 | Square | 150 | 150 psi @ 72° F | 000000000 | 000 |
| 3/4 | External Square | Not Rated | Not Rated | 000000000 | 0000 |
| 1 | Square | 150 | 150 psi @ 72° F | 000000000 | 0000 |
| 1 | External Square | Not Rated | Not Rated | 000000000 | 0000 |
Rotating Joint Manifolds
- For Use With: Air
- Temperature Range: -30° to 150° F
- Maximum Pressure: 220 psi @ 72° F
- Maximum Vacuum: 28 in. of Hg @ 72° F
Supply air to two different rotating objects from a stationary supply. The connections are sealed with an O-ring to allow different pressures and/or vacuum to be supplied simultaneously through the outlets.
For technical drawings and 3-D models, click on a part number.
Rotating Threads | Stationary Threads | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Thread Type | Gender | Pipe Size | Thread Type | Gender | Max. Speed, rpm | Body Dia. | Lg. | Material | O-Ring Material | Each | |
Right-Hand Rotating Threads | ||||||||||||
| 1/8 | NPT | Female | 1/8 | NPT | Female | 100 | 2 7/16" | 3 1/16" | Steel | Buna-N Rubber | 0000000 | 0000000 |
Industrial Quick-Disconnect Hose Couplings for Air
A complete coupling consists of a plug and a socket (both sold separately or in a set) that connect and disconnect quickly. Use them if you need frequent access to a line. They are also known as industrial interchange couplings. All Industrial plugs are compatible with any of the Industrial sockets of the same coupling size, regardless of the pipe size or barbed hose ID.
Steel is stronger and more durable than other metals. Zinc-plated steel has fair corrosion resistance and should be used primarily in dry environments. Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: 230 psi @ 72° F
- Temperature Range: 0° to 212° F
Sockets have a shut-off valve that stops the flow when the coupling is separated, so air won’t leak from the line.
Manifolds distribute air to multiple lines.
Push-to-connect sockets join by forcefully pushing the plug and socket together until you hear a click. Unlike sleeve-lock sockets, you should not slide back the sleeve to connect. To disconnect, slide the sleeve on the socket forward until the plug ejects.
For Plug Tip | |||||||
|---|---|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | Pipe Size | Thread Material | Number of Mounting Holes | Each | |
Zinc-Plated Steel | |||||||
| 1/4 | 3/16" | 5/16" | 1/2 | Zinc-Plated Steel | 4 | 0000000 | 000000 |
- Maximum Pressure: 230 psi @ 72° F
- Temperature Range: 0° to 212° F
Sockets have a shut-off valve that stops the flow when the coupling is separated, so air won’t leak from the line.
Manifolds distribute air to multiple lines.
Push-to-connect sockets join by forcefully pushing the plug and socket together until you hear a click. Unlike sleeve-lock sockets, you should not slide back the sleeve to connect. To disconnect, slide the sleeve on the socket forward until the plug ejects.
For Plug Tip | |||||||
|---|---|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | Pipe Size | Thread Material | Number of Mounting Holes | Each | |
Zinc-Plated Steel | |||||||
| 1/4 | 3/16" | 5/16" | 1/2 | Zinc-Plated Steel | 4 | 0000000 | 0000000 |
- Maximum Pressure: 230 psi @ 72° F
- Temperature Range: 0° to 212° F
Sockets have a shut-off valve that stops the flow when the coupling is separated, so air won’t leak from the line.
Manifolds distribute air to multiple lines.
Push-to-connect sockets join by forcefully pushing the plug and socket together until you hear a click. Unlike sleeve-lock sockets, you should not slide back the sleeve to connect. To disconnect, slide the sleeve on the socket forward until the plug ejects.
For Plug Tip | |||||||
|---|---|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | Pipe Size | Thread Material | Number of Mounting Holes | Each | |
Zinc-Plated Steel | |||||||
| 1/4 | 3/16" | 5/16" | 1/2 | Zinc-Plated Steel | 4 | 0000000 | 0000000 |
- Maximum Pressure: 230 psi @ 72° F
- Temperature Range: 0° to 212° F
Sockets have a shut-off valve that stops the flow when the coupling is separated, so air won’t leak from the line.
Manifolds distribute air to multiple lines.
Push-to-connect sockets join by forcefully pushing the plug and socket together until you hear a click. Unlike sleeve-lock sockets, you should not slide back the sleeve to connect. To disconnect, slide the sleeve on the socket forward until the plug ejects.
For Plug Tip | |||||||
|---|---|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | Pipe Size | Thread Material | Number of Mounting Holes | Each | |
Zinc-Plated Steel | |||||||
| 1/4 | 3/16" | 5/16" | 1/2 | Zinc-Plated Steel | 4 | 0000000 | 0000000 |
ARO Quick-Disconnect Hose Couplings for Air
A complete coupling consists of a plug and a socket (both sold separately or in a set) that connect and disconnect quickly. Use them if you need frequent access to a line. All ARO plugs are compatible with any of the ARO sockets of the same coupling size, regardless of the pipe size or barbed hose ID.
Sockets have a shut-off valve that stops the flow when the coupling is separated, so air won’t leak from the line.
Push-to-connect sockets are easier to connect than sleeve-lock sockets. Connect by pushing the plug into the socket until you hear a click. To disconnect, slide the sleeve on the socket forward until the plug ejects.
Manifolds give you a centralized and mounted location for plugging in your air tool line.
Steel is stronger and more durable than other metals. Zinc-plated steel has fair corrosion resistance and should be used primarily in dry environments.Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: 230 psi @ 72° F
- Maximum Vacuum: Not Rated
- Temperature Range: 0° to 212° F
Number Of | For Plug Tip | |||||||
|---|---|---|---|---|---|---|---|---|
| Inlets | Outlets | Coupling Size | Lg. | Dia. | Pipe Size | Thread Type | Each | |
Zinc-Plated Steel | ||||||||
| 1 | 4 | 1/4 | 3/8" | 5/16" | 1/2 | BSPP | 0000000 | 0000000 |
Grease Fitting Junction Blocks
Choose these blocks if you need to lubricate multiple points but need to control how each is greased. Unlike grease fitting manifolds, these blocks have multiple fittings, so you control what each point receives and when. Use the compression fittings on the outlets to connect tubing (not included) between the grease fittings and lubrication points.
Magnetic-mount blocks stick to machines and other steel surfaces.
Zinc-plated steel blocks have mild corrosion resistance.
For technical drawings and 3-D models, click on a part number.
Zinc-Plated Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Number of Inlets | Number of Outlets | For Tube OD | For NLGI Viscosity Grade | Overall Wd. | Overall Dp. | Overall Ht. | Max. Pressure, psi | Each | |
Junction Blocks | |||||||||
| 3 | 3 | 1/4" | 00, 0, 1, 2 | 2 3/4" | 3/4" | 2 3/4" | 1,800 | 000000 | 000000 |
| 6 | 6 | 1/4" | 00, 0, 1, 2 | 5 3/4" | 3/4" | 2 3/4" | 1,800 | 000000 | 000000 |
| 10 | 10 | 1/4" | 00, 0, 1, 2 | 9 3/4" | 3/4" | 2 1/2" | 5,000 | 000000 | 000000 |
Magnetic-Mount Junction Blocks | |||||||||
| 3 | 3 | 1/4" | 00, 0, 1, 2 | 5 5/8" | 1 11/16" | 2 11/16" | 5,000 | 000000 | 000000 |
| 6 | 6 | 1/4" | 00, 0, 1, 2 | 6 5/8" | 1 11/16" | 2 11/16" | 5,000 | 000000 | 000000 |
| 10 | 10 | 1/4" | 00, 0, 1, 2 | 10 5/8" | 1 11/16" | 2 3/4" | 5,000 | 000000 | 000000 |
Compact Manifolds for Hydraulic Jacks
Connect up to five rams to a single pump. Includes plugs to cover ports not in use.
For technical drawings and 3-D models, click on a part number.
Mounting | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Number of Ports | Pipe Size | Thread Type | Gender | Max. Pressure, psi | Material | Fasteners Included | No. of Holes | Hole Dia. | Includes | Each | |
| 6 | 3/8 | NPTF | Female | 10,000 | Steel | No | 2 | 1/4" | Four Plugs | 0000000 | 0000000 |
Flow-Adjustment Manifolds for Hydraulic Jacks
Connect up to four rams and a gauge to a pump. Ram connections have flow-adjustment valves that control the flow of oil to adjust ram speed or shut it off to temporarily hold a load. Combine two or more manifolds for larger systems.
For technical drawings and 3-D models, click on a part number.
| Pipe Size | Thread Type | Gender | Max. Pressure, psi | Material | Includes | Each | |
| 3/8 | NPTF | Female | 10,000 | Steel | 18" Long Rubber Hose | 0000000 | 0000000 |
Threaded Precision Flow-Adjustment Valves with Gauge Ports
- Valve Type: Needle
- For Use With: See table
- Seal Material: Fluoroelastomer Rubber
With a gauge port on each side of these valves, you can install two pieces of instrumentation equipment to simultaneously monitor multiple media properties without interrupting flow. Turn the handle to adjust flow in small increments for metering, sampling, and other applications requiring fine flow control. Valves have a 316 stainless steel body for excellent corrosion resistance.
Metal-to-metal seats resist temperature fluctuations.
Bubble-tight soft seats provide a tighter seal than metal-to-metal seats when the valve is completely closed.
Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
For technical drawings and 3-D models, click on a part number.
Gauge Ports | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | No. of | Pipe Size | Gender | Thread Type | Flow Coefficient (Cv) | Max. Pressure | End-to-End Lg. | For Use With | Each | |
Steel Body—Metal-to-Metal Seat | ||||||||||
NPT Male × NPT Female | ||||||||||
| 1/2 × 1/2 | 2 | 1/2 | Female | NPT | 0.44 | 10000 psi @ 200° F | 5 3/8" | Oil, Air, Argon, Helium, Krypton, Neon, Xenon | 0000000 | 0000000 |
| 3/4 × 1/2 | 2 | 1/2 | Female | NPT | 0.44 | 10000 psi @ 200° F | 5 3/8" | Oil, Air, Argon, Helium, Krypton, Neon, Xenon | 0000000 | 000000 |
Steel Body—Bubble-Tight Soft Seat | ||||||||||
NPT Male × NPT Female | ||||||||||
| 1/2 × 1/2 | 2 | 1/2 | Female | NPT | 0.64 | 6000 psi @ 200° F | 5 3/8" | Air, Argon, Helium, Krypton, Neon, Xenon | 0000000 | 000000 |
| 3/4 × 1/2 | 2 | 1/2 | Female | NPT | 0.64 | 6000 psi @ 200° F | 5 3/8" | Air, Argon, Helium, Krypton, Neon, Xenon | 0000000 | 000000 |
Threaded Precision Flow-Adjustment Valves with Vent Port
- Valve Type: Needle
- For Use With: See table
- Seal Material: Fluoroelastomer Rubber
Also known as block and bleed valves, these have a vent port that allows you to remove instrumentation equipment attached to the valve without depressurizing your line. Turn the handle to shut off flow and remove the vent port plug to drain liquid trapped in the valve. Valves adjust flow in small increments for metering, sampling, and other applications requiring fine flow control.
Metal-to-metal seats resist temperature fluctuations.
Bubble-tight soft seats provide a tighter seal than metal-to-metal seats when the valve is completely closed.
Flow coefficient (Cv) is the amount of water (in gallons per minute) at 60° F that will flow through a fully open valve with a difference of 1 psi between the inlet and the outlet.
For technical drawings and 3-D models, click on a part number.
| Pipe Size | Flow Coefficient (Cv) | Max. Pressure | End-to-End Lg. | For Use With | Each | |
Carbon Steel Body—Metal-to-Metal Seat | ||||||
|---|---|---|---|---|---|---|
NPT Female × NPT Female | ||||||
| 1/4 | 0.44 | 10000 psi @ 200° F | 2 1/2" | Oil, Air, Argon, Helium, Krypton, Neon, Xenon | 0000000 | 000000 |
| 1/2 | 0.44 | 10000 psi @ 200° F | 2 1/2" | Oil, Air, Argon, Helium, Krypton, Neon, Xenon | 0000000 | 00000 |
NPT Female × NPT Male | ||||||
| 1/4 | 0.44 | 10000 psi @ 200° F | 3 1/2" | Oil, Air, Argon, Helium, Krypton, Neon, Xenon | 0000000 | 00000 |
| 1/2 | 0.44 | 10000 psi @ 200° F | 3 1/2" | Oil, Air, Argon, Helium, Krypton, Neon, Xenon | 0000000 | 00000 |
Carbon Steel Body—Bubble-Tight Soft Seat | ||||||
NPT Female × NPT Female | ||||||
| 1/4 | 0.76 | 6000 psi @ 200° F | 2 1/2" | Air, Argon, Helium, Krypton, Neon, Xenon | 0000000 | 00000 |
| 1/2 | 0.76 | 6000 psi @ 200° F | 2 1/2" | Air, Argon, Helium, Krypton, Neon, Xenon | 0000000 | 00000 |
NPT Female × NPT Male | ||||||
| 1/4 | 0.76 | 6000 psi @ 200° F | 3 1/2" | Air, Argon, Helium, Krypton, Neon, Xenon | 0000000 | 00000 |
| 1/2 | 0.76 | 6000 psi @ 200° F | 3 1/2" | Air, Argon, Helium, Krypton, Neon, Xenon | 0000000 | 00000 |