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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Yor-Lok Fittings for Stainless Steel Tubing
(SAE Straight) Male
Threads with Gasket
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.
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.
(SAE Straight) Male
Threads with Gasket
- For Use With:
Inch:
NPT and BSPT Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water
BSPP Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Mineral Oil, Water
UN/UNF (SAE Straight) Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil
Metric:
NPT, BSPT, and UN/UNF (SAE Straight) Threads: Air, Cutting Oil, Fuel Oil, Gasoline, Hydraulic Fluid, Mineral Oil, Natural Gas, Steam, Water - Tubing:
Inch:
NPT and UN/UNF (SAE Straight) Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
BSPP and BSPT Threads: Use with seamless 304 or 316 stainless steel that meets ASTM A269
Metric:
NPT, BSPT, and UN/UNF (SAE Straight) Threads: Use with welded or seamless 304/304L or 316/316L stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
For Tube | ||||||||
|---|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Thread Size  | Material | Gasket Material | Max. Pressure | Temp. Range, °F | Each | |
UN/UNF (SAE Straight) Threads | ||||||||
| 1 1/4" | 0.083" | 1 5/8"-12 | 316 Stainless Steel | Fluoroelastomer Rubber | 1,900 psi @ 72° F | -15° to 400° | 00000000 | 0000000 |
Use these nuts with Yor-Lok sleeves and fittings to create an extra-strong seal on stainless steel tubing. They are 316 stainless steel for excellent corrosion resistance.
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Nut Material | Max. Pressure | Temp. Range, °F | Each | |
| 1 1/4" | 0.083" | 316 Stainless Steel | 2,000 psi @ 72° F | -420° to 1200° | 00000000 | 000000 |
Couple these sleeves with Yor-Lok nuts and fittings to create an extra-strong seal on stainless steel tubing. Sleeves are 316 stainless steel for excellent corrosion resistance. They are also known as ferrules.
For Tube | Front Sleeve | Back Sleeve | |||||||
|---|---|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Sleeve Material | Lg. | No. Included | Lg. | No. Included | Max. Pressure | Each | |
Sleeves | |||||||||
| 1 1/4" | 0.083" | 316 Stainless Steel | 35/64" | 1 | 13/64" | 1 | 2,000 psi @ 72° F | 00000000 | 000000 |
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 withstand high pressure, so they’re often used in hydraulic applications. Made from 316 stainless steel, they resist corrosion from water and chemicals. A complete fitting requires 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: See table
- Temperature Range: See table
| For Tube OD | Pipe Size | For Use With | Material | Max. Pressure | Temp. Range, °F | Each | |
NPT Threads | |||||||
|---|---|---|---|---|---|---|---|
| 1 1/4" | 1 1/4 | Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water | 316 Stainless Steel | 3,000 psi @ 72° F | -420° to 1200° | 000000000 | 0000000 |
- For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
- Temperature Range: See table
| For Tube OD | Pipe Size | Material | Max. Pressure | Temp. Range, °F | Each | |
NPT Threads | ||||||
|---|---|---|---|---|---|---|
| 1 1/4" | 1 1/4 | 316 Stainless Steel | 2,500 psi @ 72° F | -380° to 800° | 000000000 | 0000000 |
- For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
- Temperature Range: See table
| For Tube OD | Material | Temp. Range, °F | Each | |
| 1 1/4" | 316 Stainless Steel | -420° to 1200° | 000000000 | 0000000 |
- For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
- Temperature Range: See table
| For Tube OD | Material | Temp. Range, °F | Each | |
| 1 1/4" | 316 Stainless Steel | -420° to 1200° | 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 1/4" | 316 Stainless Steel | 000000000 | 000000 |
- 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 1/4" | 316 Stainless Steel | 000000000 | 000000 |
Nuts for 37° Flared Fittings for Stainless Steel Tubing
- For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
- Temperature Range: -420° to 1,200° F
- Tubing: Use with seamless or welded 304 or 316 stainless steel that meets ASTM A213, ASTM A249, or ASTM A269
- Specifications Met: ISO 8434, SAE J514
Use these nuts with a sleeve and fitting to provide a tight metal-to-metal seal on stainless steel tubing that is flared to 37°. Nuts are 316 stainless steel for excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Nut Material | Each | |
| 1 1/4" | 316 Stainless Steel | 000000000 | 000000 |
Precision AN 37° Flared Fittings for Stainless Steel Tubing
- For Use With: Air, Cutting Oil, Fuel Oil, Hydraulic Fluid, Mineral Oil, Water
- Temperature Range: -320° to 1200° F
- Tubing: Use with seamless 304 or 316 stainless steel
- Specifications Met: See Table
The threads on the tube end of these fittings are Class 3A or 3B and adhere to tighter tolerances than other 37° flared fittings. They are made to exact AS (formerly AN) specifications and provide a tight metal-to-metal seal on tubing that is flared to 37°. Fittings require a nut and a sleeve (ferrule) for each tube end. Nuts and sleeves are sold separately.
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 | Pipe Size | Max. Pressure | Specifications Met | Each | |
304 Stainless Steel | |||||
|---|---|---|---|---|---|
ANPT Threads | |||||
| 1 1/4" | 1 1/4 | 1,500 psi @ 72° F | AN816-20J, ASTM A380, SAE AS4841 | 00000000 | 0000000 |
| For Tube OD | Max. Pressure | Specifications Met | Each | |
316 Stainless Steel | ||||
|---|---|---|---|---|
| 1 1/4" | 1,500 psi @ 72° F | AN929-20K, ASTM A380, SAE AS4841 | 00000000 | 0000000 |
Nuts for Precision AN 37° Flared Fittings for Stainless Steel Tubing
- For Use With: Air, Cutting Oil, Fuel Oil, Hydraulic Fluid, Mineral Oil, Water
- Temperature Range: -320° to 1200° F
- Tubing: Use with seamless 304 or 316 stainless steel
- Specifications Met: See Table
Use these nuts with precision AN sleeves and fittings to provide a tight metal-to-metal seal on stainless steel tubing that is flared to 37°. The threads are Class 3B and adhere to tighter tolerances than other nuts. They are made to exact AS (formerly AN) specifications.
304 stainless steel nuts have very good corrosion resistance. 316 stainless steel nuts have excellent corrosion resistance.
For technical drawings and 3-D models, click on a part number.
37° Flared Fittings for Steel Tubing
- For Use With: Air, Cutting Oil, Fuel Oil, Hydraulic Fluid, Mineral Oil
- Tubing: Use with seamless steel
- Specifications Met: SAE J514
Also known as JIC (Joint Industrial Council) fittings, these provide a tight metal-to-metal seal on tubing that is flared to 37°. They require a nut and a sleeve (ferrule) for each tube end. Nuts and sleeves are sold separately. Fittings are zinc-plated steel for fair corrosion resistance.
NPTF (Dryseal) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
- Temperature Range: -60° to 400° F
| For Tube OD | Pipe Size | Material | Max. Pressure | Each | |
NPTF Threads | |||||
|---|---|---|---|---|---|
| 1 1/4" | 1 1/4 | Zinc-Plated Steel | 2,000 psi @ 72° F | 00000000 | 000000 |
- Temperature Range: -60° to 400° 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 | |
NPTF Threads | |||||
|---|---|---|---|---|---|
| 1 1/4" | 1 1/4 | Zinc-Plated Steel | 2,500 psi @ 72° F | 000000000 | 000000 |
- Temperature Range: -60° to 400° F
| For Tube OD | Material | Max. Pressure | Each | |
| 1 1/4" | Zinc-Plated Steel | 2,000 psi @ 72° F | 000000000 | 000000 |
- Temperature Range: NPT: -65° to 400° F
NPTF and BSPT: -60° to 400° F
Metric and BSPP with O-Rings: -30° to 200°F
BSPP with Washers: -20° to 212° F
| For Tube OD | Pipe Size | Material | Max. Pressure | Each | |
NPTF Threads | |||||
|---|---|---|---|---|---|
| 1 1/4" | 1 1/4 | Zinc-Plated Steel | 1,150 psi @ 72° F | 000000000 | 000000 |
- Temperature Range: -60° to 400° F
| For Tube OD | Material | Max. Pressure | Each | |
| 1 1/4" | Zinc-Plated Steel | 4,000 psi @ 72° F | 000000000 | 000000 |
- Temperature Range: -60° to 400° F
| For Tube OD | Material | Max. Pressure | Each | |
| 1 1/4" | Zinc-Plated Steel | 4,000 psi @ 72° F | 000000000 | 000000 |
- Temperature Range: -60° to 400° F
Use these sleeves with a nut and fitting to provide a tight metal-to-metal seal on steel tubing that is flared to 37°. Sleeves are zinc-plated steel for fair corrosion resistance. They are also known as ferrules.
For Tube OD | ||||
|---|---|---|---|---|
| Inch | Sleeve Material | Max. Pressure | Each | |
Inch Sleeves | ||||
| 1 1/4" | Zinc-Plated Steel | 2,000 psi @ 72° F | 00000000 | 00000 |
- Temperature Range: -60° to 400° F
| For Tube OD | Nut Material | Max. Pressure | Each | |
| 1 1/4" | Zinc-Plated Steel | 2,000 psi @ 72° F | 00000000 | 000000 |
Nuts for 37° Flared Fittings for Steel Tubing
- For Use With: Air, Fuel Oil, Hydraulic Fluid, Mineral Oil
- Temp. Range: -60° to 400° F
- Tubing: Use with seamless steel
- Specifications Met: SAE J514
Use these nuts with a sleeve and fitting to provide a tight metal-to-metal seal on steel tubing that is flared to 37°. They are zinc-plated steel for fair corrosion resistance.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Nut Material | Max. Pressure | Each | |
| 1 1/4" | Zinc-Plated Steel | 2,000 psi @ 72° F | 00000000 | 000000 |
Nuts for 37° Flared Fittings for Aluminum Tubing
- For Use With: Air, Coolant, Gasoline, Hydraulic Fluid, Water
- Temperature Range: -60° to 350° F
- Tubing: Use with seamless aluminum
Use these nuts with a sleeve and fitting to provide a tight metal-to-metal seal on aluminum tubing that is flared to 37°. Nuts are aluminum, which is lightweight with good corrosion resistance.
For technical drawings and 3-D models, click on a part number.
| For Tube OD | Nut Material | Max. Pressure | Each | |
| 1 1/4" | Anodized 2024 Aluminum | 1,500 psi @ 72° F | 0000000 | 000000 |
Gaskets for 37° Flared Tube Fittings
Prevent leaks from temperature fluctuations and vibration that can loosen 37° flared tube fittings. In general, you should match your gasket material to your fitting material. But, if you have a brass fitting, you can use a copper gasket.
Gaskets without a coating are best for fittings that are exposed to harsh chemicals, such as antifreeze, which can dissolve the threadlocker coating.
Threadlocker-coated gaskets offer a more secure hold than uncoated gaskets, so they’re best for areas with high vibration.
For technical drawings and 3-D models, click on a part number.
Thread | Temperature, °F | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| For Tube OD | Dash Size | Size | Type | Thickness | Maximum Pressure, psi | Min. | Max. | Each | |
304 Stainless Steel | |||||||||
| 1 1/4" | 20 | 1 5/8"-12 | UN/UNF (JIC) | 0.335" | 20,000 | Not Rated | 2500° | 00000000 | 000000 |
Threadlocker-Coated 304 Stainless Steel—Orange | |||||||||
| 1 1/4" | 20 | 1 5/8"-12 | UN/UNF (JIC) | 0.335" | 20,000 | -40° | 300° | 00000000 | 00000 |
316 Stainless Steel | |||||||||
| 1 1/4" | 20 | 1 5/8"-12 | UN/UNF (JIC) | 0.335" | 20,000 | Not Rated | 2500° | 00000000 | 00000 |
Threadlocker-Coated 316 Stainless Steel—Black | |||||||||
| 1 1/4" | 20 | 1 5/8"-12 | UN/UNF (JIC) | 0.335" | 20,000 | -40° | 1200° | 00000000 | 0000 |
Threadlocker-Coated 316 Stainless Steel—Green | |||||||||
| 1 1/4" | 20 | 1 5/8"-12 | UN/UNF (JIC) | 0.335" | 20,000 | -40° | 300° | 00000000 | 00000 |
Copper | |||||||||
| 1 1/4" | 20 | 1 5/8"-12 | UN/UNF (JIC) | 0.335" | 20,000 | -420° | 800° | 00000000 | 00000 |
Threadlocker-Coated Copper—Purple | |||||||||
| 1 1/4" | 20 | 1 5/8"-12 | UN/UNF (JIC) | 0.335" | 20,000 | -40° | 300° | 00000000 | 00000 |