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.
NPTF (Dryseal) threads are compatible with NPT threads.
Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size.
- 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.
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 | Each | |
Brass | |||||
| 3/4 | 5/16" | 13/16" | 1/2 | 0000000 | 000000 |
- 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.
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 | Each | |
Brass | |||||
| 3/4 | 5/16" | 13/16" | 1/2 | 0000000 | 000000 |
- 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.
Tru-Flate 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 Tru-Flate plugs are compatible with any of the Tru-Flate sockets of the same coupling size, regardless of the pipe size or barbed hose ID. They are also known as automotive couplings.
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.
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. NPTF (Dryseal) threads are compatible with NPT threads.
Note: To ensure a correct fit, make sure that the plug and socket have the same coupling size.
- Maximum Pressure: 300 psi @ 72° F
- Maximum Vacuum: 26 in. of Hg @ 72° F
- Temperature Range: -40° to 225° F
For Plug Tip | |||||
|---|---|---|---|---|---|
| Coupling Size | Lg. | Dia. | Pipe Size | Each | |
Zinc-Plated Steel | |||||
| 1/2 | 1/8" | 9/16" | 1/2 | 00000000 | 000000 |
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 with a threaded end are also known as hose nipples.
Note: To ensure proper connection, the barbed end has to be pushed in all the way, with the hose end concealed by the ring.
- Maximum Pressure: See table
- Maximum Vacuum: See table
- Temperature Range: -20° to 150° F
Adapters | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
Ring Stop | Replacement Ring Stops | ||||||||||
| For Hose ID | Pipe Size | Material | Color | Max. Pressure | Max. Vacuum | Pkg. Qty. | Pkg. | Pkg. Qty. | Pkg. | ||
Brass | |||||||||||
| 1" | 1 1/2 | Plastic | Yellow | 250 psi @ 72° F | 27 in. of Hg @ 72° F | 1 | 00000000 | 000000 | 5 | 000000000 | 000000 |
303/304 Stainless Steel | |||||||||||
| 1" | 1 1/2 | Plastic | Yellow | 250 psi @ 72° F | 27 in. of Hg @ 72° F | 1 | 00000000 | 000000 | 5 | 000000000 | 00000 |
Quick-Clamp High-Vacuum Fittings for Stainless Steel Tubing
- For Use With:
Fittings with Gasket End: Air, Argon, Helium, Nitrogen
All Other Fittings: Air - Specifications Met: ISO 2861
Instead of a gasket, these fittings have a metal-reinforced O-ring that is designed for high-vacuum applications, such as vacuum coating and heat treating, leak testing, and analyzing gases. Also known as KF, QF, and NW fittings, they are the most common type of connection in high-vacuum systems. Connect with a clamp and another quick-clamp fitting for fast, easy access to your line. To use fittings in pressure applications, use a pressure-rated ring (sold separately). Made of 304 stainless steel, these fittings have very good corrosion resistance.
Note: To complete a connection, you’ll need two quick-clamp fittings, a ring, and a clamp (all sold separately).
- Temperature Range: 0° to 300° F
- Tubing: Use with 304/304L or 316/316L stainless steel
Fittings with threaded pipe end require PTFE tape for sealing the threads.
| For Tube OD | Flange OD | High-Vacuum Flange Size | High Vacuum Connection Type | Pipe Size | Material | Max. Vacuum | Each | |
NPT Threads | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1" | 1.57" | 25 | ISO-KF | 1/2 | 304 Stainless Steel | 10 -8 torr @ 72° F | 00000000 | 0000000 |
| 1" | 1.57" | 25 | ISO-KF | 3/4 | 304 Stainless Steel | 10 -8 torr @ 72° F | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 1/2 | 304 Stainless Steel | 10 -8 torr @ 72° F | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 3/4 | 304 Stainless Steel | 10 -8 torr @ 72° F | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 1 | 304 Stainless Steel | 10 -8 torr @ 72° F | 00000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 1/2 | 304 Stainless Steel | 10 -8 torr @ 72° F | 00000000 | 000000 |
- Temperature Range: 0° to 300° F
- Tubing: Use with 304/304L stainless steel, 316/316L stainless steel, or aluminum
Clamps tighten by hand.
Lever clamps are also known as toggle clamps.
Clamps with lanyard let you secure the clamp to equipment.
| For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | Material | Max. Vacuum | Lanyard Lg. | Each | |
Wing Nut | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1" | 1.57" | 25 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | __ | 0000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | __ | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | __ | 0000000 | 00000 |
Lever | ||||||||
| 1" | 1.57" | 25 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | __ | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | __ | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | __ | 0000000 | 00000 |
Lever with Lanyard | ||||||||
| 1" | 1.57" | 25 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | 5 3/4" | 00000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | 5 3/4" | 00000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | Aluminum | 10 -8 torr @ 72° F | 5 3/4" | 00000000 | 00000 |
- Temperature Range:
Fittings with Viton® Fluoroelastomer Rubber O-Ring: 0° to 300° F
Fittings with Silicone Rubber O-Ring: -50° to 390°F - Tubing: Use with 304/304L stainless steel, 316/316L stainless steel, or aluminum
Use these rings with quick-clamp high-vacuum fittings. They consist of a stainless steel inner ring covered by an O-ring.
Silicone rings withstand higher temperatures than fluoroelastomer ones.
| For Tube OD | For Flange OD | For High-Vacuum Flange Size | High Vacuum Connection Type | Inner Ring Material | Max. Vacuum | Max. Pressure | Each | |
Viton® Fluoroelastomer Rubber O-Ring | ||||||||
|---|---|---|---|---|---|---|---|---|
Rings | ||||||||
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 0000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 0000000 | 00000 |
Rings with Stainless Steel Screen | ||||||||
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
Rings with Aluminum Outer Ring | ||||||||
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 100 psi @ 72° F | 0000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 75 psi @ 72° F | 0000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 50 psi @ 72° F | 0000000 | 00000 |
Silicone Rubber O-Ring | ||||||||
Rings | ||||||||
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | Not Rated | 00000000 | 00000 |
- Temperature Range: 0° to 300° F
- Tubing: Use with 304/304L stainless steel, 316/316L stainless steel, or aluminum
Hose absorbs moderate vibration
| For Tube OD | Flange OD | High-Vacuum Flange Size | High Vacuum Connection Type | Material | Max. Vacuum | Bend Radius | Flexibility | Each | |
4 3/16" Lg. | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | __ | Flexible | 0000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | __ | Flexible | 0000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | __ | Flexible | 0000000 | 000000 |
12" Lg. | |||||||||
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 1 3/8" | Flexible | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 2 1/2" | Flexible | 00000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 3 1/4" | Flexible | 00000000 | 000000 |
24" Lg. | |||||||||
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 1 3/8" | Flexible | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 2 1/2" | Flexible | 00000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 3 1/4" | Flexible | 00000000 | 000000 |
39" Lg. | |||||||||
| 1" | 1.57" | 25 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 1 3/8" | Flexible | 00000000 | 000000 |
| 1 1/2" | 2.16" | 40 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 2 1/2" | Flexible | 00000000 | 000000 |
| 2" | 2.95" | 50 | ISO-KF | 304 Stainless Steel | 10 -8 torr @ 72° F | 3 1/4" | Flexible | 00000000 | 000000 |
- Temperature Range: 0° to 190° F
- Tubing: Use with 304/304L or 316/316L stainless steel
Valves are also known as vacuum isolation valves. They connect to a vacuum system so you can install gauges, release gases, and remove air. They operate manually and have a compact body that fits easily into tight spaces.
| Actuation | For Tube OD | Flange OD | High-Vacuum Flange Size | High Vacuum Connection Type | Max. Vacuum | Body Material | Overall Ht. | Overall Lg. | Each | |
| Manual | 1" | 1 9/16" | 25 | ISO-KF | 10 -8 torr @ 72° F | 304 Stainless Steel | 5 5/8" | 3" | 00000000 | 0000000 |
| Manual | 1 1/2" | 2 1/8" | 40 | ISO-KF | 10 -8 torr @ 72° F | 304 Stainless Steel | 6 3/8" | 3 7/8" | 00000000 | 000000 |
| Manual | 2" | 2 15/16" | 50 | ISO-KF | 10 -8 torr @ 72° F | 304 Stainless Steel | 8" | 4 1/2" | 00000000 | 000000 |
Compression Fittings for Steel Tubing
- For Use With: Inch: Air, Hydraulic Fluid, Water
Metric: Hydraulic Fluid - Tubing: Inch: Use with welded steel
Metric: Use with seamless steel - Specifications Met: Inch: SAE J514
Metric: ISO 8434, DIN 2353
A single sleeve (ferrule) bites into tubing as you tighten the nut, creating a strong seal. The nut and sleeve are included. Fittings are also known as flareless and bite fittings.
Zinc-plated steel fittings have fair corrosion resistance.
- Temperature Range: See table
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Temp. Range, °F | Each | |
| 3/4" | 0.065" | Zinc-Plated Steel | 2,000 psi @ 72° F | -65° to 400° | 000000000 | 000000 |
- Temperature Range: See table
| For Tube OD | Nut Material | Max. Pressure | Temp. Range, °F | Each | |
| 3/4" | Zinc-Plated Steel | 2,000 psi @ 72° F | -65° to 400° | 000000000 | 00000 |
- Temperature Range: See table
| For Tube OD | Sleeve Material | Max. Pressure | Temp. Range, °F | Each | |
| 3/4" | Zinc-Plated Steel | 2,000 psi @ 72° F | -65° to 400° | 000000000 | 00000 |