How to Measure Threaded Pipe Size
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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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Precision Extreme-Pressure Stainless Steel Threaded Pipe Fittings
Made to tighter tolerances than other stainless steel pipe fittings, these are also known as instrumentation fittings. The male threads are rolled for extra strength in extreme-pressure applications. Fittings are commonly used to connect equipment in gas and hydraulic fluid lines. They are 316 stainless steel for excellent corrosion resistance. 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.
(SAE Straight) Male
Threads with Gasket
- For Use With:
NPT × BSPP: Natural Gas, Water
NPT × BSPT and UN/UNF (SAE Straight) Male × NPT Male: Hydraulic Fluid, Liquid Nitrogen, Natural Gas, Steam, Water - Specifications Met:
NPT × BSPP: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A276, ASTM A479, ISO 228.1, ISO 228.2, ISO BS 2779
NPT × BSPT: ASME B1.20.1, ASME B31.1, ASME B31.3, ISO 7.1, ISO BS2.1
UN/UNF (SAE Straight) Male × NPT Male: ASME B1.20.1, ASME B31.1, ASME B31.3, ASTM A182, ASTM A276, ASTM A479, SAE J1926
Thread Size (A) | Dash Size (A) | Pipe Size (B) | Dash Size (B) | Max. Pressure | Max. Steam Pressure | Each | |
UN/UNF (SAE Straight) Male × NPT Male | |||||||
|---|---|---|---|---|---|---|---|
| 1 5/16"-12 | 18 | 1 | 18 | 2,900 psi @ 72° F | 2,900 psi @ 300° F | 000000000 | 000000 |
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. 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.
(SAE Straight) Male
Threads with Gasket
- Specifications Met: See table
- For Use With: See table
Thread Size | Dash Size | 316 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|---|---|
| (A) | (B) | (A) | (B) | Max. Pressure | Max. Steam Pressure | For Use With | Specifications Met | Each | |
UN/UNF (SAE Straight) Female × UN/UNF (SAE Straight) Male | |||||||||
| 1 5/16"-12 | 1 1/16"-12 | 16 | 12 | 2,400 psi @ 72° F | 2,400 psi @ 200° F | Hydraulic Fluid, Oil, Steam, Water | SAE J514 | 000000000 | 000000 |
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. 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: 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 | ||||||||||
| 3/4"-16 | 1 5/16"-12 | 08 | 16 | 1" | 4,500 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 000000 |
| 1 1/16"-12 | 1 5/16"-12 | 12 | 16 | 1 3/4" | 4,500 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 00000 |
| 1 5/16"-12 | 1 7/8"-12 | 16 | 24 | 1" | 3,000 psi @ 72° F | Zinc Plated Steel | Air, Hydraulic Fluid, Water | ASTM A108 | 000000000 | 00000 |
Straight-Flow Rectangular Manifolds
Unlike other manifolds, which have an inlet on either end, these have one inlet on the opposite side from the outlets. This design allows fluid or air to follow a straight path, improving flow through your system. It also frees up the ends of the manifold, so you can mount it in corners and in narrow spaces. Manifolds are also known as headers. They have mounting holes, so you can mount from the top or side.
Anodized aluminum manifolds are the industry standard for the most common types of applications. They are lighter in weight than other metal manifolds and have good corrosion resistance. These manifolds are anodized for a black finish.
Use a plug (sold separately) to close off any unused inlets and outlets.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Water, Hydraulic Fluid
- Temperature Range: -10° to 200° F
- Maximum Pressure:
Air: 1,000 psi @ 72° F
Water: 1,000 psi @ 72° F
Hydraulic Fluid: 3,000 psi @ 72° F
Low-Profile Square Manifolds
With outlets on the side instead of on top, these manifolds have a lower profile than rectangular manifolds and fit well in cramped spaces. Use them to distribute air, water, or hydraulic fluid to three locations from a single supply source. Manifolds have mounting holes, so you can mount from the top.
Anodized aluminum manifolds are the industry standard for the most common types of applications. They are lighter in weight than other metal manifolds and have good corrosion resistance. These manifolds are anodized for a black finish.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Water, Hydraulic Fluid
- Temperature Range: -10° to 200° F
- Maximum Pressure: 1,000 psi @ 72° F
- Maximum Vacuum: 27 in. of Hg @ 72° F
Inlet | Outlet | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| No. of Outlets | Thread Size | Dash Size | Thread Size | Dash Size | Lg. | Wd. | Ht. | Color | Each | |
| 3 | 1 5/16"-12 | 16 | 1 1/16"-12 | 12 | 2 3/4" | 2 3/4" | 1 1/2" | Black | 0000000 | 0000000 |
Low-Profile Hex Manifolds
When you’re short on vertical space, these manifolds are a good fit—they have outlets on the side instead of on top, so they have a lower profile than rectangular manifolds. Use them to distribute air, water, or hydraulic fluid to five locations from a single supply source. Manifolds have mounting holes, so you can mount from the top.
Anodized aluminum manifolds are the industry standard for the most common types of applications. They are lighter in weight than other metal manifolds and have good corrosion resistance. These manifolds are anodized for a black finish.
316 stainless steel manifolds have excellent corrosion resistance and can handle fuel, gasoline, coolant and other harsh substances.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Water, Hydraulic Fluid
- Temperature Range: -10° to 200° F
- Maximum Pressure: 1,000 psi @ 72° F
- Maximum Vacuum: 27 in. of Hg @ 72° F
- For Use With: Air, Water, Hydraulic Fluid, Alcohol, Coolant, Cutting Oil, Deionized Water, Diesel Fuel, Fuel Oil, Gasoline, Mineral Oil, Nitrogen
- Temperature Range: -100° to 500° F
- Maximum Pressure: 3,500 psi @ 72° F
- Maximum Vacuum: 27 in. of Hg @ 72° F
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 (A) | For Tube OD (B) | Max. Pressure | Specifications Met | Each | |
304 Stainless Steel | |||||
|---|---|---|---|---|---|
| 1" | 1/2" | 3,000 psi @ 72° F | AN919-29J, ASTM A380, SAE AS4841 | 00000000 | 000000 |
| 1" | 3/4" | 3,000 psi @ 72° F | AN919-23J, ASTM A380, SAE AS4841 | 00000000 | 00000 |
316 Stainless Steel | |||||
| 1" | 1/2" | 3,000 psi @ 72° F | AN919-29K, ASTM A380, SAE AS4841 | 00000000 | 00000 |
| 1" | 3/4" | 3,000 psi @ 72° F | AN919-23K, ASTM A380, SAE AS4841 | 00000000 | 000000 |
| For Tube OD | Max. Pressure | Specifications Met | Each | |
304 Stainless Steel | ||||
|---|---|---|---|---|
| 1/2" | 3,000 psi @ 72° F | AN818-8J, ASTM A380, SAE AS4841 | 0000000 | 000000 |
| 3/4" | 3,000 psi @ 72° F | AN818-12J, ASTM A380, SAE AS4841 | 0000000 | 00000 |
| 1" | 3,000 psi @ 72° F | AN818-16J, ASTM A380, SAE AS4841 | 00000000 | 00000 |
316 Stainless Steel | ||||
| 1/2" | 3,000 psi @ 72° F | AN818-8K, ASTM A380, SAE AS4841 | 00000000 | 00000 |
| 3/4" | 3,000 psi @ 72° F | AN818-12K, ASTM A380, SAE AS4841 | 00000000 | 00000 |
| 1" | 3,000 psi @ 72° F | AN818-16K, ASTM A380, SAE AS4841 | 00000000 | 00000 |
| For Tube OD | Max. Pressure | Specifications Met | Each | |
304 Stainless Steel | ||||
|---|---|---|---|---|
| 1/2" | 3,000 psi @ 72° F | AN819-8J, ASTM A380, MS20819, SAE AS4841, SAE AS5176 | 0000000 | 00000 |
| 3/4" | 3,000 psi @ 72° F | AN819-12J, ASTM A380, MS20819, SAE AS4841, SAE AS5176 | 0000000 | 00000 |
| 1" | 3,000 psi @ 72° F | AN819-16J, ASTM A380, MS20819, SAE AS4841, SAE AS5176 | 00000000 | 00000 |
316 Stainless Steel | ||||
| 1/2" | 3,000 psi @ 72° F | AN819-8K, ASTM A380, MS20819, SAE AS4841, SAE AS5176 | 00000000 | 00000 |
| 3/4" | 3,000 psi @ 72° F | AN819-12K, ASTM A380, MS20819, SAE AS4841, SAE AS5176 | 00000000 | 00000 |
| 1" | 3,000 psi @ 72° F | AN819-16K, ASTM A380, MS20819, SAE AS4841, SAE AS5176 | 00000000 | 00000 |
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: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
- Temperature Range: See table
| For Tube OD (A) | For Tube OD (B) | Material | Max. Pressure | Temp. Range, °F | Each | |
| 1" | 1/2" | 316 Stainless Steel | 3,000 psi @ 72° F | -380° to 800° | 000000000 | 000000 |
- For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
- Temperature Range: -420° to 1200°
Fittings with female tube end have an internal flare that mates with the male tube end of another fitting.
- For Use With: Air, Hydraulic Fluid, Isopropyl Alcohol, Natural Gas, Phosphoric Acid, Water
- Temperature Range: -420° to 1,200° F
- 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.
Inch × metric sleeve adapters convert the fitting from inch to metric.
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.
For technical drawings and 3-D models, click on a part number.
- Temperature Range: -60° to 400° F
| For Tube OD (A) | For Tube OD (B) | Material | Max. Pressure | Each | |
| 1" | 3/4" | Zinc-Plated Steel | 4,500 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.
