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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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. Brass is softer than other metals, so it’s easier to thread together. It has good corrosion resistance. 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: 300 psi @ 72° F
- Temperature Range: -40° to 225° F
- Specifications Met: See table
Sockets have a shut-off valve that stops the flow when the coupling is separated, so air won’t leak from the line.
Sleeve-lock sockets connect by sliding back the sleeve on the socket, inserting the plug, and releasing the sleeve. To disconnect, slide the sleeve back and pull out the plug.
For Plug Tip | ||||||
|---|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | Pipe Size | Specifications Met | Each | |
Brass | ||||||
| 1/2 | 3/8" | 9/16" | 1/4 | Fed. Spec. A-A-59439, ISO 6150/B | 00000000 | 000000 |
- Maximum Pressure: 300 psi @ 72° F
- Maximum Vacuum: 26 in. of Hg @ 72° F
- Temperature Range: -40° to 225° F
- Specifications Met: ISO 6150/B
Sockets have a shut-off valve that stops the flow when the coupling is separated, so air won’t leak from the line.
Twist sockets connect by inserting the plug into the socket and sliding the socket forward until it locks in place. To disconnect, slide the sleeve back while twisting it left and right; the twisting action vents the downstream air to release pressure, making it safe to remove the plug.
For Plug Tip | |||||
|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | Pipe Size | Each | |
Zinc-Plated Steel | |||||
| 3/8 | 5/16" | 7/16" | 3/8 | 0000000 | 000000 |
Lincoln Quick-Disconnect Hose Couplings for Air
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 line. All Lincoln plugs are compatible with any of the Lincoln sockets, regardless of the pipe size.
Plugs and sockets with a shut-off valve have a valve that stops the flow when the coupling is separated, so air won’t leak from the line.
Sleeve-lock sockets connect by sliding back the sleeve on the socket, inserting the plug, and releasing the sleeve. To disconnect, slide the sleeve back and pull out the plug.
Zinc-plated steel is stronger and more durable than other metals. It has fair corrosion resistance, so it should be used primarily in dry environments.
Brass is softer than other metals, so it’s easier to thread together. It has good corrosion resistance.
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: 300 psi @ 72° F
- Temperature Range: -40° to 240° F
For Plug Tip | |||||||
|---|---|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | Pipe Size | Thread Type | Flow Control | Each | |
Brass | |||||||
| 1/4 | 3/4" | 9/32" | 1/4 | NPT | With Shut-Off | 00000000 | 000000 |
Compact Quick-Disconnect Hose Couplings for Air
A slim body allows these couplings to fit into tight spaces. 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 line. All Compact plugs are compatible with any of the Compact 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. They 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.
Plugs and sockets with a barbed end insert into plastic or rubber hose and secure with a crimp-on hose ferrule.
Brass is softer than zinc-plated steel, so it’s easier to thread together. It offers good corrosion resistance.
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: 500 psi @ 72° F
- Temperature Range: -40° to 250° F
- Attachment Type: Use Crimp-On Hose Ferrules
For Plug Tip | |||||
|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | For Hose ID | Each | |
Brass | |||||
| 1/4 | 7/32" | 5/16" | 1/4" | 00000000 | 000000 |
Metal Barbed Hose Fittings for Air and Water
Slide the barbed end into rubber hose and secure with the appropriate clamp or crimp-on hose ferrule.
Bronze fittings have better corrosion resistance and are stronger than brass and aluminum fittings. Fittings with a threaded end are also known as hose nipples.
For technical drawings and 3-D models, click on a part number.
- Maximum Pressure: See table
- Maximum Vacuum: See table
- Temperature Range: See table
- Attachment Type: See table
- Specifications Met: See table
| For Hose ID | Pipe Size | Max. Pressure | Max. Vacuum | Temperature Range, °F | Attachment Type | Specifications Met | Pkg. Qty. | Pkg. | |
Bronze | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 5/8" | 1/2 | 100 psi @ 72° F | Not Rated | 32° to 212° | Worm-Drive Clamp | ASTM B584, UL 1121 | 1 | 0000000 | 00000 |
Yor-Lok Fittings for Stainless Steel Tubing
A nut with two sleeves (ferrules) gives these fittings extra gripping power. The sleeves bite into tubing as you tighten the nut, creating a strong seal. Also known as instrumentation fittings, they are made to tight tolerances for use in high-precision applications. They are compatible with Swagelok®, Let-Lok, and A-Lok fittings.
316 stainless steel fittings have excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
- Tubing: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through your wall or panel to create an inlet or outlet.
For Tube | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Pipe Size | Material | Max. Pressure | Temp. Range, °F | For Hole Dia. | For Max. Wall Thick. | Each | |
NPT Threads | |||||||||
| 1/2" | 0.035" | 1/2 | 316 Stainless Steel | 2,000 psi @ 72° F | -420° to 1200° | 3/4" | 19/32" | 00000000 | 000000 |
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Nut Material | Max. Pressure | Temp. Range, °F | Each | |
| 1/2" | 0.035" | 316 Stainless Steel | 2,000 psi @ 72° F | -420° to 1200° | 00000000 | 000000 |
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Sleeve Material | Max. Pressure | Temp. Range, °F | Each | |
| 1/2" | 0.035" | 316 Stainless Steel | 2,000 psi @ 72° F | -420° to 1200° | 00000000 | 00000 |
PTFE sleeves are plastic instead of stainless steel, so they won’t damage tubing.
| For Tube OD | Sleeve Material | Max. Pressure | Temp. Range, °F | Each | |
| 1/2" | PTFE Plastic | Not Rated | -65° to 350° | 00000000 | 00000 |
Tube supports are recommended for soft plastic tubing to prevent the tube from collapsing.
For Tube | |||||
|---|---|---|---|---|---|
| OD | ID | Tube Support Material | Temp. Range, °F | Each | |
| 1/2" | 1/4" | 316 Stainless Steel | -420° to 1200° | 00000000 | 00000 |
Brass Push-to-Connect Fittings for Copper Tubing
- Tubing: Use with K, M, L copper, polyethylene plastic, CPVC
Connect these fittings to copper tubing with a push—no heat, solder, or flux required. They have an internal gripping ring and O-ring that hold the fitting secure. They also come with a tube support if you want to use them with polyethylene plastic (PEX) tubing. They are also known as instant fittings. Fittings are brass for good corrosion resistance. They are compatible with SharkBite® fittings. To adhere to safety standards for drinking water systems, use fittings that meet NSF/ANSI 61.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Drinking Water
- Temperature Range: 32° to 200° F
- Specifications Met: NSF/ANSI 61
Standard Caps | |||||||
|---|---|---|---|---|---|---|---|
| Copper Tube Size | For Tube OD | Material | Release Ring Material | Release Ring Color | Max. Pressure | Each | |
| 1 1/2 | 1 5/8" | Brass | Plastic | Black | 200 psi @ 72° F | 0000000 | 000000 |
A release clip or release wrench is required to disconnect the fitting from the tubing.
| For Copper Tube Size | For Tube OD | Each | |
| 1 1/4, 1 1/2, 2 | 1 3/8", 1 5/8", 2 1/8" | 0000000 | 000000 |