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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Nickel-Plated Brass Push-to-Connect Tube Fittings for Air
(SAE Straight) Male
Threads with Gasket
- For Use With: Air, Lubricated Air
- Temperature Range: 0° to 140° F
- Tubing: Fittings with Release Ring and Fittings with no Release Type: Use with firm or hard (Durometer 95A-60D) nylon plastic, polyethylene plastic or polyurethane rubber
Fittings with Release Sleeve: Use with firm or hard (Durometer 95A-60D) polyethylene plastic or polyurethane rubber
Made of nickel-plated brass, these fittings have better corrosion resistance than unplated brass fittings. Also known as instant fittings, they connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. To disconnect, push on the release ring or sleeve and pull the tubing out of the fitting.
Fittings with release sleeve are easier to disconnect than fittings with a release ring because they are seamless and won't collect dirt and debris.
Metric and UN/UNF (SAE Straight) male threads with gasket or thread sealant provide extra protection against leaks. UN/UNF (SAE Straight) threads are also known as O-ring boss threads.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
Release Sleeve | |||||||
|---|---|---|---|---|---|---|---|
| For Tube OD | Thread Size | Thread Pitch, mm | Material | Gasket Material | Max. Pressure | Each | |
Metric Threads | |||||||
| 3/16" | M3 | 0.5 | Nickel-Plated Brass | Buna-N Rubber | 230 psi @ 72° F | 00000000 | 000000 |
| 3/16" | M5 | 0.8 | Nickel-Plated Brass | Buna-N Rubber | 230 psi @ 72° F | 00000000 | 00000 |
UN/UNF (SAE Straight) Threads | |||||||
| 5/32" | 10-32 | __ | Nickel-Plated Brass | Buna-N Rubber | 230 psi @ 72° F | 00000000 | 00000 |
Moisture-Resistant Push-to-Connect Tube Fittings for Air and Water
- For Use With: Air, Lubricated Air, Water,
except Manifolds with Swivel: Air, Water - Temperature Range: 32° to 100° F
- Tubing: Use with firm (Durometer 90A-95A) nylon plastic or polyurethane rubber
These fittings won’t absorb moisture, so they’re good for water and high-humidity air applications. Also known as instant fittings, they connect to tubing with a push, and an internal gripping ring and O-ring hold the tubing tight. To disconnect, push on the release ring and pull the tubing out of the fitting. They have good corrosion resistance.
Nickel-plated brass fittings have better corrosion resistance than unfinished brass fittings.
Fittings with thread sealant offer extra protection against leaks.
UN/UNF (SAE Straight) male threads have a gasket or a washer and gasket to protect against leaks. UN/UNF (SAE Straight) threads are also known as O-ring boss threads.
For technical drawings and 3-D models, click on a part number.
Release Ring | ||||||||
|---|---|---|---|---|---|---|---|---|
| For Tube OD | Pipe Size | Material | Color | Max. Pressure | Features | Choose a Material | Each | |
NPT Threads | ||||||||
| 5/32" | 1/16 | Plastic | Orange | 140 psi @ 72° F | Acrylic Thread Sealant | 00000000 | 00000 | |
Release Ring | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | Pipe Size | Material | Color | Max. Pressure | Drive Size | Features | Choose a Material | Each | |
NPT Threads | |||||||||
| 5/32" | 1/16 | Plastic | Orange | 140 psi @ 72° F | 1/8" | Acrylic Thread Sealant | 00000000 | 00000 | |
| 3/16" | 1/8 | Plastic | Orange | 140 psi @ 72° F | 1/8" | Acrylic Thread Sealant | 00000000 | 0000 | |
| 1/4" | 1/8 | Plastic | Orange | 140 psi @ 72° F | 3/16" | Acrylic Thread Sealant | 00000000 | 0000 | |
| 1/4" | 1/4 | Plastic | Orange | 140 psi @ 72° F | 3/16" | Acrylic Thread Sealant | 00000000 | 0000 | |
Release Ring | |||||||
|---|---|---|---|---|---|---|---|
| For Tube OD | Thread Size | Material | Color | Max. Pressure | Choose a Material | Each | |
UN/UNF (SAE Straight) Threads | |||||||
| 1/8" | 10-32 | Plastic | Orange | 140 psi @ 72° F | 00000000 | 00000 | |
Choose-a-Color Aluminum Low-Pressure Barbed Tube Fittings for Air and Water
- For Use With: Air, Lubricated Air, Water
- Temperature Range: -40° to 230° F
- Tubing: Use with hard (Durometer 75A-60D) EVA plastic, polyethylene plastic, polyurethane rubber or PVDF plastic
Color-code fittings for easy identification. Fittings are aluminum, which is lightweight with good corrosion resistance. The barb grips onto tubing, providing a secure hold with no clamp required.
Metric and UN/UNF (SAE Straight) male threads have a gasket for a tight seal.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
Aluminum Low-Pressure Barbed Tube Fittings for Air and Water
- For Use With: Air, Lubricated Air, Water
- Temperature Range: -40° to 230° F
- Tubing: Use with hard (Durometer 75A-60D) EVA plastic, polyethylene plastic, polyurethane rubber or PVDF plastic
Made of aluminum, these fittings are lighter in weight than other metal barbed tube fittings and have good corrosion resistance. The barb grips onto tubing, providing a secure hold with no clamp required.
Metric, BSPP, and UN/UNF (SAE Straight) male threads have a gasket or O-ring for a tight seal.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
Stainless Steel High-Pressure Barbed Tube Fittings for Air and Water
- Temperature Range: See table
- Tubing: Use with firm (Durometer 75A-95A) EVA plastic, polyethylene plastic, polypropylene plastic or PVC plastic
Fittings withstand pressures up to 250 psi. They are 303 stainless steel for very good corrosion resistance.
Metric, BSPP, and UN/UNF (SAE Straight) male threads have a gasket to protect against leaks. UN/UNF (SAE Straight) threads are also known as O-ring boss threads.
For technical drawings and 3-D models, click on a part number.
UN/UNF (SAE Straight)
Male Threads with Gasket
| For Tube ID | Thread Size | Material | Gasket Material | Max. Pressure | Temp. Range, °F | Number of Barbs | Each | |
UN/UNF (SAE Straight) Threads | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/4" | 10-32 | 303 Stainless Steel | Viton® Fluoroelastomer Rubber | 250 psi @ 72° F | -40° to 1200° F | Single | 0000000 | 00000 |
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
- Clarity: Black: Opaque; White: Opaque; Off-White: Semi-Clear
| For Tube ID | Thread Size | Material | Max. Pressure | Temp. Range, °F | Pkg. Qty. | Color | Pkg. | |
UNF Threads | ||||||||
|---|---|---|---|---|---|---|---|---|
| 1/8" | 1/4"-28 | Nylon Plastic | Not Rated | -50° to 275° | 10 | White | 00000000 | 00000 |
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 | |||||||
|---|---|---|---|---|---|---|---|
| 1/8" | 1/4"-28 | Acetal Plastic | White | Semi-Clear | Not Rated | 00000000 | 00000 |
Tight-Seal Brass Compression Tube Fittings for Air and Water
- Temperature Range: -65° to 250° F
- Tubing: Use with firm (Durometer 95A) EVA plastic or polyurethane rubber
- Specifications Met: SAE J512
A built-in tube support slips inside the tubing to prevent collapsing and provides a sturdy connection for an extra-tight seal. Fittings have a single sleeve (ferrule) that compresses the tubing as you tighten the nut. The nut and sleeve are included. Fittings are also known as flareless fittings. They are brass for good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Pipe Size | Material | Max. Pressure | Each | |
NPT Threads | |||||
|---|---|---|---|---|---|
| 3/8" | 1/8 | Brass | 90 psi @ 72° F | 00000000 | 00000 |
| For Tube OD | Nut Material | Max. Pressure | Pkg. Qty. | Pkg. | |
| 3/8" | Brass | 90 psi @ 72° F | 25 | 00000000 | 000000 |
Sleeve | ||||||
|---|---|---|---|---|---|---|
| For Tube OD | Material | Color | Max. Pressure | Pkg. Qty. | Pkg. | |
| 3/8" | Acetal Plastic | White | 90 psi @ 72° F | 25 | 00000000 | 00000 |
Plastic Quick-Turn Tube Couplings for Air and Water
- For Use With: Polycarbonate Plastic: Air
Nylon Plastic: Air, Water
Polypropylene Plastic: Water - Temperature Range: Nylon Plastic, Polycarbonate Plastic: -20° to 200° F
Polypropylene Plastic: 35° to 150° F - Tubing: Use with soft (Durometer 40A-65A) PVC plastic or silicone rubber
Made of plastic, these couplings are lighter in weight than metal quick-turn couplings. Also known as luer lock couplings, they consist of a plug and socket (sold separately) that connect with a half turn. They have a compact body for easy installation in tight spaces. Plugs and sockets are open-flow style, so there is no shut-off valve to stop the flow when the coupling is separated. They have a universal connection, so the plugs will connect to any of the sockets, regardless of the pipe or tube size.
Nylon plugs and sockets have good impact and abrasion resistance. Polycarbonate plugs and sockets are clear so you can monitor your line. Note: For a complete coupling, order a plug and a socket.
For technical drawings and 3-D models, click on a part number.
| Pipe Size | Material | Color | Clarity | Max. Pressure | Pkg. Qty. | Pkg. | |
NPT Threads | |||||||
|---|---|---|---|---|---|---|---|
| 1/8 | Nylon Plastic | White | Opaque | 40 psi @ 72° F | 10 | 000000000 | 000000 |
Butt-Weld Fittings for Stainless Steel Tubing
- For Use With: See table
- Temperature Range: See table
- Tubing:
304 Stainless Steel: Use with 304/304L stainless steel that meets ASTM A213, ASTM A269, or ASTM A270, except DIN EN 10357 fittings with only ASTM A269 or ASTM A270
316 Stainless Steel: Use with 316/316L stainless steel that meets ASTM A213, ASTM A269, or ASTM A270, except ASME BPE and DIN EN 10357 fittings with only ASTM A269 or ASTM A270 - Specifications Met: See table
Weld these fittings to tubing for a permanent, flush connection that permits smooth flow through a line.
304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Max. Pressure | Max. Vacuum | Temp. Range Min., °F | Temp. Range Max., °F | Wall Thick. | For Use With | Each | |
304/304L Stainless Steel | ||||||||
|---|---|---|---|---|---|---|---|---|
Polished | ||||||||
| 2" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° | 250° | 0.065" | Air, Food, Water | 00000000 | 000000 |
316/316L Stainless Steel | ||||||||
Polished | ||||||||
| 2" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° | 250° | 0.065" | Air, Food, Water | 0000000 | 00000 |
Dull | ||||||||
| 2" | 550 psi @ 72° F | 10 -6 torr @ 72° F | -65° | 250° | 0.065" | Air, Food, Water | 00000000 | 00000 |
Ultra-High-Vacuum Flanges and Fittings for Stainless Steel Tubing
- For Use With: Air
- Temperature Range:
Flanges: -300° to 800° F
Gaskets: Not Rated - Tubing: Use with 304/304L and 316/316L stainless steel
- Specifications Met:
Flanges: ASTM A240, ASTM E45, ASTM E12
Gaskets: ASTM B152-179, ASTM F68
Create access points in ultra-high-vacuum lines or chambers by bolting two same-size flanges together with a copper gasket (sold separately) between them. The flanges’ sharp edges dig into the copper gasket and form an extremely tight seal, which means they handle higher vacuum pressures than other high-vacuum fittings with rubber gaskets. Also known as CF, Conflat, and UHV fittings, use them in vacuum coating, heat treating, and drying applications, as well as for leak testing and analyzing gases. They’re stainless steel so they resist rusting.
Fittings with a rotating flange turn so you can easily match up the bolt holes with another flange that may be misaligned.
Socket-connect flanges are easier to weld than butt-weld flanges because they don’t need to align perfectly to tubing; insert the tubing into the socket end and weld together.
Caps are also known as blind flanges.
Bolt kits are required to make a complete connection.
For technical drawings and 3-D models, click on a part number.
Socket-Connect Tube Connection | Flanged Tube Connection | Bolt Hole | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | Socket Dp. | For Tube OD | Flange OD | High-Vacuum Flange Size | High Vacuum Connection Type | Bolt Circle Dia. | Dia. | No. of | Bolts Included | No. of Bolt Kits Required | Lg. | Max. Vacuum | Material | Appearance | Each | |
Fixed | ||||||||||||||||
| 4" | 7/16" | 4" | 6" | 100 | CF | 5 1/8" | 21/64" | 16 | No | 2 | 25/32" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 0000000 |
Rotating | ||||||||||||||||
| 4" | 7/16" | 4" | 6" | 100 | CF | 5 1/8" | 21/64" | 16 | No | 2 | 25/32" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 000000 |
Bolt Hole | ||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | Flange OD | High-Vacuum Flange Size | High Vacuum Connection Type | Bolt Circle Dia. | Dia. | No. of | Bolts Included | No. of Bolt Kits Required | Lg. | Max. Vacuum | Material | Appearance | Each | |
Fixed | ||||||||||||||
| 4" | 6" | 100 | CF | 5 1/8" | 21/64" | 16 | No | 2 | 25/32" | 1 × 10 -13 torr @72° F | 304 Stainless Steel | Polished | 0000000 | 0000000 |
| For Tube OD | For Flange OD | Gasket Material | Specifications Met | Each | |
| 4" | 6" | Copper | ASTM F68 | 0000000 | 000000 |
| For Flange OD | For High-Vacuum Flange Size | Bolt Dia. | Thread Size | No. of Bolts Included | No. of Nuts Included | No. of Washers Included | Bolt Material | Each | |
| 6" | 100 | 5/16" | 5/16"-24 | 16 | 16 | 32 | 18-8 Stainless Steel | 0000000 | 000000 |
30° Flared Fittings for Steel Tubing
- Specifications Met: See table
Also known as JIS (Japanese Industrial Standard) fittings, these have a 30° flare on one or both ends. Fittings are zinc-plated steel for fair corrosion resistance.
For technical drawings and 3-D models, click on a part number.
- Temperature Range: -65° to 500° F
| For Tube OD | Pipe Size | Material | Max. Pressure | Specifications Met | Each | |
| 1/4" | 1/8 | Zinc-Plated Steel | 5,000 psi @ 72° F | ISO 228-1, JIS B 0202, JIS B 8363 | 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.
For technical drawings and 3-D models, click on a part number.
- Temperature Range: See table
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Temp. Range, °F | Each | |
| 3/8" | 0.035" | Zinc-Plated Steel | 3,000 psi @ 72° F | -65° to 400° | 000000000 | 00000 |
- Temperature Range: See table
| For Tube OD | Nut Material | Max. Pressure | Temp. Range, °F | Each | |
| 3/8" | Zinc-Plated Steel | 3,000 psi @ 72° F | -65° to 400° | 000000000 | 00000 |
- Temperature Range: See table
| For Tube OD | Sleeve Material | Max. Pressure | Temp. Range, °F | Each | |
| 3/8" | Zinc-Plated Steel | 3,000 psi @ 72° F | -65° to 400° | 000000000 | 00000 |
45° Flared Fittings for Copper and Brass Tubing
- Temperature Range: -65° to 250° F
- Tubing: Use with seamless brass and copper that meets ASTM B280
No sleeve is required to assemble these fittings, which makes for a faster, more convenient installation compared to 37° flared fittings. They require a nut (sold separately) for each tube end. Fittings are also known as refrigeration and SAE fittings. They are brass for good corrosion resistance.
Copper tube size is the accepted designation of the copper tubing industry, not the actual tube OD.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water
- Specifications Met: SAE J512, SAE J513, UL Listed
For Tube | |||||
|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Each | |
| 5/16" | 0.032" | Brass | 1,200 psi @ 72° F | 000000000 | 00000 |
- For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water; except nuts for 1" tube OD are not for use with fuel oil
- Specifications Met: SAE J512, SAE J513, UL Listed; except nuts for 1" tube OD meet SAE J512 and SAE J513 only
Supported 45° Flared Fittings for Copper and Brass Tubing
- For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water
- Temperature Range: -65° to 250° F
- Tubing: Use with seamless brass and copper
- Specifications Met:
Metric: SAE J512, SAE J513, UL Listed
All other fittings: SAE J512, UL Listed; except tee connectors for 1/2" tube OD
The flared end nests inside the fitting body, providing extra support to the tubing. Fittings are also known as inverted 45° flared fittings, refrigeration fittings, and SAE fittings. To assemble, place the nut (sold separately) on the tubing, flare the end of the tubing, then insert the tubing into the fitting and tighten the nut. Fittings are brass for good corrosion resistance.
NPTF (Dryseal) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
