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.
Brass is softer than other metals, so it’s easier to thread together. It has good corrosion resistance. 303 stainless steel has very good corrosion resistance, so it’s the best choice for high-humidity 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: 300 psi @ 72° F
- Temperature Range: -40° to 225° F
- Attachment Type: See table
- Specifications Met: See table
Plugs are also known as nipples.
Plugs and sockets with a clamp-on/crimp-on barbed end insert into rubber hose and secure with a clamp or a crimp-on hose ferrule.
Plug Tip | |||||||
|---|---|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | For Hose ID | Attachment Type | Specifications Met | Each | |
Brass | |||||||
| 1/2 | 3/8" | 9/16" | 3/4" | Band-and-Buckle Clamp | Fed. Spec. A-A-59439, ISO 6150/B | 0000000 | 000000 |
- Maximum Pressure: 300 psi @ 72° F
- Temperature Range: -40° to 225° F
- Attachment Type: See table
- 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.
Plugs and sockets with a clamp-on/crimp-on barbed end insert into rubber hose and secure with a clamp or a crimp-on hose ferrule.
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. | For Hose ID | Attachment Type | Specifications Met | Each | |
Brass | |||||||
| 1/4 | 3/16" | 5/16" | 1/4" | Crimp-On Hose Ferrule | Fed. Spec. A-A-59439, ISO 6150/B | 0000000 | 000000 |
| 1/4 | 3/16" | 5/16" | 3/8" | Crimp-On Hose Ferrule | Fed. Spec. A-A-59439, ISO 6150/B | 0000000 | 00000 |
303 Stainless Steel  | |||||||
| 1/4 | 3/16" | 5/16" | 1/4" | Crimp-On Hose Ferrule | Fed. Spec. A-A-59439, ISO 6150/B | 0000000 | 00000 |
| 1/4 | 3/16" | 5/16" | 3/8" | Crimp-On Hose Ferrule | Fed. Spec. A-A-59439, ISO 6150/B | 0000000 | 00000 |
Metal Push-On Barbed Hose Fittings for Air and Water
Fittings have sharper barbs than standard barbed hose fittings to grip rubber push-on hose with no clamps or ferrules required. The more you pull on the fittings, the tighter the hose will grip.
Brass fittings are softer than other metal fittings, so they’re easier to thread together. They have good corrosion resistance.
Fittings that swivel until tightened rotate 360° for easy installation.
Fittings with a threaded end are also known as hose nipples.The optional installation tool (sold separately) allows you to connect large quantities of barbed fittings to push-on hose. Use the built-in cutter to squarely cut the hose without fraying. Next, lubricate either the push-on hose, fitting or both. Then, clamp the hose into the tool’s vise and apply light pressure on the handle to drive into the fitting.
NPTF (Dryseal) threads are compatible with NPT threads.
Note: To ensure proper connection, the barbed end has to be pushed in all the way, with the hose end concealed by the ring.
For technical drawings and 3-D models, click on a part number.
Mounting Hole | ||||||||
|---|---|---|---|---|---|---|---|---|
| For Hose ID Range | Lg. | Ht. | Dp. | Dia. | No. of | Mounting Fasteners Included | Each | |
| 1/4" to 3/4" | 13 1/2" | 7" | 2 3/8" | 5/8" | 4 | No | 00000000 | 0000000 |
Push-to-Connect Tube Fittings for Air
- Temperature Range: 0° to 170° F, except polybutylene plastic fittings are 32° to 140° F
- Tubing: Use with firm (Durometer 95A-45D) polyethylene plastic or polyurethane rubber
- Specifications Met: ISO 14743, except cartridges and polybutylene plastic fittings
Insert tubing into these fittings and an internal gripping ring and O-ring hold the tubing tight. They are also known as instant fittings. To disconnect, push on the release ring and pull the tubing out of the fitting. Fittings have good corrosion resistance. Use them in low-pressure applications.
Identification rings (sold separately) snap over the release ring so you can color-code your lines.
Clips (sold separately) align and organize your tubing and fittings.
For technical drawings and 3-D models, click on a part number.
37° Flared Fittings for Stainless Steel Tubing
- Tubing: Use with welded or seamless 304 or 316 stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
- Specifications Met: ISO 8434, SAE J514, except fittings with BSPP and BSPT threads meet SAE J514 only
Also known as JIC (Joint Industrial Council) fittings, these provide a tight metal-to-metal seal on tubing that is flared to 37°. They are 316 stainless steel for excellent corrosion resistance. Fittings require a nut and a sleeve (ferrule) for each tube end. Nuts and sleeves are sold separately.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
- Temperature Range: -420° to 1,200° F
Fittings that swivel until tightened have a built-in nut that rotates 360° for easy installation.
Fittings with female tube end have an internal flare that mates with the male tube end of another fitting.
| For Tube OD | Pipe Size | Material | Max. Pressure | Each | |
NPT Threads | |||||
|---|---|---|---|---|---|
| 1 1/2" | 1 1/2 | 316 Stainless Steel | 2,000 psi @ 72° F | 000000000 | 0000000 |
- For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
- Temperature Range: -420° to 1,200° F
| For Tube OD | Nut Material | Each | |
| 1 1/2" | 316 Stainless Steel | 000000000 | 0000000 |
- For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
- Temperature Range: -420° to 1,200° F
Use these sleeves with a nut and fitting to provide a tight metal-to-metal seal on stainless steel tubing that is flared to 37°. Sleeves are 316 stainless steel for excellent corrosion resistance. They are also known as ferrules.
For Tube OD | |||
|---|---|---|---|
| Inch | Sleeve Material | Each | |
Inch | |||
| 1 1/2" | 316 Stainless Steel | 000000000 | 000000 |
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 | |||||||||
| 3/4" | 0.049" to 0.109" | 3/4 | 316 Stainless Steel | 2,000 psi @ 72° F | -420° to 1200° | 1 1/16" | 25/32" | 00000000 | 0000000 |
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Nut Material | Max. Pressure | Temp. Range, °F | Each | |
| 3/4" | 0.049" | 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 | |
| 3/4" | 0.049" | 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 | |
| 3/4" | PTFE Plastic | Not Rated | -65° to 350° | 00000000 | 000000 |
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 | |
| 3/4" | 1/2" | 316 Stainless Steel | -420° to 1200° | 00000000 | 000000 |