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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Extreme-Pressure Stainless Steel Threaded Pipe Fittings
With the strength to handle extreme pressures, these fittings can be used to connect equipment in hydraulic fluid lines. 316 stainless steel fittings have excellent corrosion resistance.
NPTF (Dryseal) threads are compatible with NPT threads. BSPP and metric male threads have either a gasket or a gasket and washer to prevent leaks. UN/UNF (SAE Straight) threads are also known as O-ring boss threads; the male threads have a gasket to prevent leaks.
For technical drawings and 3-D models, click on a part number.
UN/UNF (SAE Straight)
Male Threads with Gasket
- Specifications Met: See table
- For Use With: See table
316 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|
| Thread Size (A) | Dash Size (A) | Thread Size (B) | Max. Pressure | For Use With | Specifications Met | Each | |
UN/UNF (SAE Straight) Female × Metric Male | |||||||
| 1 5/8"-12 | 20 | M42 × 2 mm | 2,000 psi @ 72° F | Hydraulic Fluid (Petroleum Base), Oil, Water | ISO 8434-1, SAE J514 | 000000000 | 000000 |
(SAE Straight) Male
Threads with Gasket
- For Use With: See table
- Specifications Met: See table
316 Stainless Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Pipe Size (A)  | Dash Size (A) | Thread Size (B) | Dash Size (B) | Max. Pressure | Max. Steam Pressure | For Use With | Specifications Met | Each | |
NPTF Male × UN/UNF (SAE Straight) Male | |||||||||
| 1 1/4 | 20 | 1 5/8"-12 | 20 | 3,000 psi @ 72° F | 3,000 psi @ 200° F | Hydraulic Fluid, Oil, Steam, Water | SAE J514 | 000000000 | 0000000 |
Compact Extreme-Pressure Steel Threaded Pipe Fittings
These fittings are strong enough to handle extreme pressures, yet small enough to fit into cramped spaces. They are galvanized and zinc-plated steel, which have better corrosion resistance than plain steel fittings.
NPTF (Dryseal) threads are compatible with NPT threads. UN/UNF (SAE Straight) threads are also known as O-ring boss threads; the male threads have either a gasket or a gasket and washer to prevent leaks.
For technical drawings and 3-D models, click on a part number.
(SAE Straight) Male
Threads with Gasket
- For Use With: See table
- Specifications Met:
NPTF and UN/UNF (SAE Straight): ASTM A108
BSPP: ISO 1179, ISO 8434-6
BSPT: DIN EN 10226-1, ISO 7-1
| Thread Size | Dash Size | Max. Pressure | Material | For Use With | Each | |
UN/UNF (SAE Straight) Male | ||||||
|---|---|---|---|---|---|---|
| 1 5/8"-12 | 20 | 4,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | 000000000 | 000000 |
(SAE Straight) Male
Threads with Gasket
- For Use With: See table
- Specifications Met: See table
| Pipe Size (A) | Dash Size (A) | Thread Size (B) | Dash Size (B) | Max. Pressure | Material | For Use With | Specifications Met | Each | |
NPTF Female × UN/UNF (SAE Straight) Male | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1 | 16 | 1 5/8"-12 | 20 | 3,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 000000 |
(SAE Straight) Male
Threads with Gasket
- For Use With: See table
- Specifications Met: See table
Thread Size | Dash Size | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| (A) | (B) | (A) | (B) | Lg. | Max. Pressure | Material | For Use With | Specifications Met | Each | |
UN/UNF (SAE Straight) Female × UN/UNF (SAE Straight) Male | ||||||||||
| 1 1/16"-12 | 1 5/8"-12 | 12 | 20 | 1" | 4,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 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 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: 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: -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 |
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.
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 | |
304 Stainless Steel | ||||
|---|---|---|---|---|
| 1 1/4" | 1,500 psi @ 72° F | AN818-20J, ASTM A380, SAE AS4841 | 00000000 | 000000 |
| For Tube OD | Max. Pressure | Specifications Met | Each | |
304 Stainless Steel | ||||
|---|---|---|---|---|
| 1 1/4" | 1,500 psi @ 72° F | AN819-20J, ASTM A380, MS20819, SAE AS4841, SAE AS5176 | 00000000 | 000000 |
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
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 |