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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Tight-Seal Plastic Barbed Tube Fittings for Air and Water
Minimize leaks in your line—these fittings have a single barb that creates a smooth clamping surface for extra-tight connections. Fittings are nylon for excellent impact and abrasion resistance.
For technical drawings and 3-D models, click on a part number.
- Temperature Range: See table
- Tubing: Use with firm (Durometer 75A-80A) polyurethane rubber or PVC plastic
- Temperature Range: See table
- Tubing: Use with firm (Durometer 75A-80A) polyurethane rubber or PVC plastic
- Clarity: See table
For Tube ID | Thread Size | Material | Max. Pressure | Temp. Range, °F | Pkg. Qty. | Color | Clarity | Pkg. | |
UNF Threads | |||||||||
---|---|---|---|---|---|---|---|---|---|
1/16" | 10-32 | Nylon Plastic | 125 psi @ 72° F | -40° to 170° | 1 | White | Semi-Clear | 00000000 | 00000 |
3/32" | 10-32 | Nylon Plastic | 125 psi @ 72° F | -40° to 170° | 1 | White | Semi-Clear | 00000000 | 0000 |
1/8" | 10-32 | Nylon Plastic | 125 psi @ 72° F | -40° to 170° | 1 | White | Semi-Clear | 00000000 | 0000 |
5/32" | 10-32 | Nylon Plastic | 125 psi @ 72° F | -40° to 170° | 1 | White | Semi-Clear | 00000000 | 0000 |
- Temperature Range: See table
- Tubing: Use with firm (Durometer 75A-80A) polyurethane rubber or PVC plastic
- Clarity: Black: Opaque; White: Semi-Clear
Tight-Seal Moisture-Resistant Plastic Barbed Tube Fittings for Air and Water
- Temperature Range: -20° to 280° F
- Tubing: Use with firm or soft (Durometer 50A-90A) polyurethane rubber or PVC plastic
- Specifications Met: FDA Compliant 21 CFR 177.2470
Fittings have a single barb that creates a smooth clamping surface for extra-tight connections that minimize leaks. Made of acetal, they won’t absorb water and lose strength, even in high-humidity environments.
For technical drawings and 3-D models, click on a part number.
For Tube ID | Thread Size | Material | Color | Clarity | Max. Pressure | Each | |
UNF Threads | |||||||
---|---|---|---|---|---|---|---|
1/16" | 10-32 | Acetal Plastic | White | Semi-Clear | Not Rated | 0000000 | 00000 |
1/16" | 1/4"-28 | Acetal Plastic | White | Semi-Clear | Not Rated | 00000000 | 0000 |
3/32" | 10-32 | Acetal Plastic | White | Semi-Clear | Not Rated | 00000000 | 000 |
3/32" | 1/4"-28 | Acetal Plastic | White | Semi-Clear | Not Rated | 00000000 | 000 |
1/8" | 10-32 | Acetal Plastic | White | Semi-Clear | Not Rated | 0000000 | 000 |
1/8" | 1/4"-28 | Acetal Plastic | White | Semi-Clear | Not Rated | 00000000 | 0000 |
5/32" | 10-32 | Acetal Plastic | White | Semi-Clear | Not Rated | 00000000 | 000 |
5/32" | 1/4"-28 | Acetal Plastic | White | Semi-Clear | Not Rated | 00000000 | 000 |
3/16" | 1/4"-28 | Acetal Plastic | White | Semi-Clear | Not Rated | 00000000 | 000 |
For Tube ID | Thread Size | Material | Color | Clarity | Max. Pressure | Each | |
UNF Threads | |||||||
---|---|---|---|---|---|---|---|
1/16" | 10-32 | Acetal Plastic | White | Semi-Clear | Not Rated | 0000000 | 00000 |
1/8" | 10-32 | Acetal Plastic | White | Semi-Clear | Not Rated | 0000000 | 0000 |
1/8" | 1/4"-28 | Acetal Plastic | White | Semi-Clear | Not Rated | 00000000 | 0000 |
3/16" | 1/4"-28 | Acetal Plastic | White | Semi-Clear | Not Rated | 00000000 | 0000 |
Push-to-Connect Fittings for Plastic Tubing—Food and Beverage
- Temperature Range: 35° to 140° F
- Tubing: See table
- Specifications Met:
White Polypropylene: NSF/ANSI 51, NSF/ANSI 61
Black Polypropylene: FDA Compliant 21 CFR 176.170, NSF/ANSI 58, NSF/ANSI 372
Acetal: NSF/ANSI 51, NSF/ANSI 61
Also known as instant fittings, these connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. To disconnect fittings with a release ring, push on the release ring and pull the tubing out of the fitting.
Acetal fittings resist moisture, so they won’t soften and lose strength in humid environments. They meet NSF/ANSI 51 for safe use with food and NSF/ANSI 61 for safe use with drinking water.
Black fittings have excellent UV resistance and are suitable for outdoor environments.
For technical drawings and 3-D models, click on a part number.
International Standard ISO B Quick-Disconnect Hose Couplings for Hydraulic Fluid
A complete coupling consists of a plug and a socket (both sold separately) that connect and disconnect quickly. Use them if you need frequent access to a hydraulic hose line. All of the International Standard ISO B quick-disconnect plugs are compatible with any of the International Standard ISO B quick-disconnect sockets of the same coupling size, regardless of the pipe size. Couplings meet ISO 7241-1 Series B dimensional and performance standards and are compatible with Parker 60 couplings. Also known as double shut-off couplings, the plugs and sockets both have a shut-off valve that stops the flow when the coupling is separated.
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.
Zinc-plated steel is stronger and more durable than other metals. It has fair corrosion resistance.
Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size. Pressure ratings are given for static (constant) pressure conditions.
Warning: Never attempt to connect or disconnect couplings when operating at maximum pressure. Stop the flow before you disconnect the line.
For technical drawings and 3-D models, click on a part number.
1/4 Coupling Size | |
3/8 Coupling Size | |
1/2 Coupling Size |
- Maximum Pressure: 3,500 psi @ 72° F
- Temperature Range: -10° to 212° F
- Compatible With: ISO 7241-1 Series B, Parker 60
- Specifications Met: ISO 7241-1 Series B
International Standard ISO Minimal-Spill
Quick-Disconnect Hose Couplings for Hydraulic Fluid
Also known as flush-face couplings, the plugs and sockets have a flat face, which allows them to mate close against each other, reducing fluid loss when connecting and disconnecting the line. A complete coupling consists of a plug and a socket (both sold separately) that connect and disconnect quickly. Use them when you need frequent access to a line. All of the International Standard ISO Minimal-Spill quick-disconnect plugs are compatible with any of the International Standard ISO Minimal-Spill quick-disconnect sockets of the same coupling size, regardless of the pipe size. Couplings are compatible with ISO 16028 Parker FEM, ISO 16028 Perfecting HT, and ISO 16028 Snap-Tite 74 couplings. Also known as double shut-off couplings, the plugs and sockets both have a shut-off valve that stops the flow when the coupling is separated. They are zinc-plated steel, which has excellent strength and durability and fair corrosion resistance.
Plugs are also known as nipples.
Sockets are push-to-connect style. To connect, push the plug into the socket until you hear a click. To disconnect, slide the sleeve on the socket forward until the plug ejects.
Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size. Pressure ratings are given for static (constant) pressure conditions.
Warning: Never attempt to connect or disconnect couplings when operating at maximum pressure. Stop the flow before you disconnect the line.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: See table
- Temperature Range: -20° to 212° F
- Compatible With: ISO 16028 Parker FEM, ISO 16028 Perfecting HT, ISO 16028 Snap-Tite 74
- Specifications Met: ISO 16028
- Maximum Pressure: See table
- Temperature Range: -20° to 212° F
- Compatible With: ISO 16028 Parker FEM, ISO 16028 Perfecting HT, ISO 16028 Snap-Tite 74
- Specifications Met: ISO 16028
Sockets | |||||||||
---|---|---|---|---|---|---|---|---|---|
For Plug Tip | Optional Dust Plugs | ||||||||
Coupling Size | Lg. | Dia. | Thread Size | Dash Size | Max. Pressure | Each | Each | ||
Zinc-Plated Steel | |||||||||
1/4 | 1/4" | 5/8" | 7/16"-20 | 04 | 7,200 psi @ 72° F | 0000000 | 000000 | 0000000 | 00000 |
3/8 | 3/16" | 3/4" | 3/4"-16 | 06 | 5,800 psi @ 72° F | 0000000 | 00000 | 0000000 | 0000 |
1/2 | 3/8" | 15/16" | 3/4"-16 | 08 | 5,800 psi @ 72° F | 0000000 | 00000 | 0000000 | 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 |
Grease Fitting Adapters
When the size or thread type of a fitting doesn't match an existing opening, use these adapters to make the connection.
Zinc-plated steel adapters have mild corrosion resistance. UNF threads are similar to threads on a machine screw or bolt. They require a sealant, such as an O-ring, to minimize leakage. SAE-LT threads are tapered but designed to be installed into a 1/4"-28 straight-thread UNF hole.
For technical drawings and 3-D models, click on a part number.