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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Low-Pressure Stainless Steel Threaded Pipe Fittings
Use these fittings in a low-pressure pipe line.
Fittings that meet ANSI/MSS SP-114 adhere to high-quality standards for heat treating, material thickness, and marking. 304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance. Adapters with weld end allow for a permanent connection.
Adapters for tanks create an inlet or outlet connection on the surface of any tank, pressure vessel, or drum. Adapters with extension fit tightly into the hole, which keeps the fitting steady during welding.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
NPTF (Dryseal) threads and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
- For Use With: Water, Oil, Gasoline, Diesel Fuel
- Specifications Met: ASTM A182, ASME B1.20.1
316 Stainless Steel | |||||
|---|---|---|---|---|---|
Pipe Size | For Hole Dia. | OD | Lg. | Each | |
NPT Female × Weld | |||||
| 3/8 | 15/16" | 1 1/2" | 5/16" | 0000000 | 000000 |
- For Use With: Air, Natural Gas, Oil, Steam, Water
- Pressure Class:
NPSL: 150 - Fabrication:
NPSL: Heat Treated - Specifications Met:
NPSL: ANSI/MSS SP-114, ASTM A351
BSPP: DIN 431 - Pipe Nipples and Pipe:
NPSL: Use Schedule 40 stainless steel - Flanges:
NPSL: Use Class 150 stainless steel
Low-Pressure Iron and Steel Threaded Pipe Fittings
Use these fittings for low-pressure applications in noncorrosive environments.
Adapters for tanks create an inlet or outlet connection on the surface of any tank, pressure vessel, or drum. Adapters with weld end allow for a permanent connection. Adapters with extension fit tightly into the hole, which keeps the fitting steady during welding.
For technical drawings and 3-D models, click on a part number.
- For Use With: Diesel Fuel, Gasoline, Oil, Water
- Specifications Met: ASTM A105, ASTM A181
| Pipe Size | For Hole Dia. | OD | Lg. | Material | Each | |
NPT Female × Weld | ||||||
|---|---|---|---|---|---|---|
| 3/8 | 15/16" | 1 1/4" | 3/8" | Carbon Steel | 00000000 | 000000 |
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: See table
- Specifications Met: ASME B16.14
- Pipe Nipples and Pipe: Use Schedule 40 steel
Pipe Size | |||||||
|---|---|---|---|---|---|---|---|
| (A) | (B) | Pressure Class | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Male × NPT Female | |||||||
| 3/8 | 1/8 | 150 | 150 psi @ 72° F | 150 psi @ 350° F | Steel | 000000000 | 00000 |
| 3/8 | 1/4 | 150 | 150 psi @ 72° F | 150 psi @ 350° F | Steel | 000000000 | 0000 |
| 1/2 | 3/8 | 150 | 150 psi @ 72° F | 150 psi @ 350° F | Steel | 000000000 | 0000 |
| 3/4 | 3/8 | 150 | 150 psi @ 72° F | 150 psi @ 350° F | Steel | 000000000 | 0000 |
| 1 | 3/8 | 150 | 150 psi @ 72° F | 150 psi @ 350° F | Steel | 000000000 | 0000 |
- For Use With: Air, Diesel Fuel, Gasoline, Oil, Steam, Water
- Pipe Nipples and Pipe: Use Schedule 40 steel
Pipe Size | ||||||
|---|---|---|---|---|---|---|
| (A) | (B) | Lg. | Hex Wd. | Material | Each | |
NPT Male × NPT Female | ||||||
| 2 | 3/8 | 1 5/16" | 1 3/8" | Iron | 0000000 | 000000 |
Low-Pressure Galvanized Iron and Steel Threaded Pipe Fittings
The galvanized finish on these fittings provides fair corrosion resistance. Fittings are for use in low-pressure applications.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
NPSC (National Pipe Straight Coupling) threads and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Steam, Oil, Water, Natural Gas
- Pressure Class: 150
- Specifications Met: ASME B16.14
- Pipe Nipples and Pipe: Use Schedule 40 galvanized steel
- Flanges: Use Class 150 galvanized steel
| Pipe Size | Material | Each | |
NPSL Female | |||
|---|---|---|---|
| 3/8 | Galvanized Iron | 00000000 | 00000 |
Extreme-Pressure Steel Threaded Pipe Fittings
The strongest steel fittings we offer, these can withstand extreme-pressure applications.
Galvanized and zinc-plated steel fittings have better corrosion resistance than plain steel fittings. PTFE-coated steel fittings have better corrosion resistance than galvanized and zinc-plated steel fittings.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Temperature Range: -100° to 500° F
- Pipe Nipples and Pipe: Use Schedule XXH steel
- Flanges: Use Class 1500 steel
| Pipe Size | Dash Size | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Female | ||||||
|---|---|---|---|---|---|---|
| 3/8 | 06 | 10,000 psi @ 72° F | 5,000 psi @ 500° F | Galvanized Steel | 0000000 | 000000 |
Low-Pressure Aluminum Threaded Pipe Fittings
In addition to being lightweight, these aluminum fittings offer good corrosion resistance. Use them in low-pressure flow applications. To prevent cracking, do not tighten more than a 1/4-turn past hand tight.
Adapters for tanks weld onto the surface of any tank, pressure vessel, or drum to create a permanent inlet or outlet connection. Adapters with extended lip fit tightly into the hole, which keeps the fitting steady during welding.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
NPTF (Dryseal) threads and NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
DIN 3852 fittings meet DIN standards for mating surface outer diameter. They have a Buna-N rubber gasket that resists grease, hydraulic oil, and motor oil—plus mild chemicals and water. The gasket stays in a groove undercut in the mating face, which prevents it from dropping out and from extruding when fittings are tightened. Black anodized and powder-coated fittings have a decorative matte black finish.
The contact surface on fittings with a flange extends beyond the external hex drive.
For technical drawings and 3-D models, click on a part number.
- For Use With: Water, Oil, Gasoline, Diesel Fuel
- Specifications Met: ASTM B221
- Pipe Nipples and Pipe: Use Schedule 40 aluminum
| Pipe Size | For Hole Dia. | OD | Lg. | Each | |
NPT Female × Weld | |||||
|---|---|---|---|---|---|
| 3/8 | 1 3/16" | 1 7/16" | 1/4" | 0000000 | 000000 |
- For Use With: Air, Oil, Water
- Pressure Class: 150
- Pipe Nipples and Pipe: Use Schedule 40 aluminum
- Flanges: Use Class 125 aluminum
| Pipe Size | Max. Pressure | Each | |
NPSL Female | |||
|---|---|---|---|
| 3/8 | 150 psi @ 72° F | 000000000 | 00000 |
Male Threads
with Gasket
- For Use With: Air, Oil, Water
- Specifications Met: DIN 3852
- Pipe Nipples and Pipe: Use aluminum
Medium-Pressure Aluminum Threaded Pipe Fittings
Designed for medium-pressure applications, these fittings have better strength than our low-pressure aluminum pipe fittings. They are lightweight with good corrosion resistance.
Fittings with blue anodized finish have better corrosion resistance and a harder surface than plain aluminum fittings.
BSPP male threads have a gasket to protect against leaks.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Oil, Water
- Pipe Nipples and Pipe: Use Schedule 40 aluminum
| Pipe Size | Max. Pressure | Each | |
BSPT Female | |||
|---|---|---|---|
| 3/8 | 250 psi @ 72° F | 0000000 | 000000 |
- For Use With: Air, Oil, Water
| Pipe Size | Max. Pressure | Color | Finish | Each | |
NPT Female | |||||
|---|---|---|---|---|---|
| 3/8 | 500 psi @ 72° F | Blue | Anodized | 0000000 | 000000 |
- For Use With: Air, Oil, Water
| Pipe Size | Max. Pressure | Color | Finish | Each | |
NPT Male | |||||
|---|---|---|---|---|---|
| 3/8 | 500 psi @ 72° F | Blue | Anodized | 0000000 | 000000 |
- For Use With: Air, Oil, Water
- Specifications Met: ASME B1.20.1, ASTM B241
Low-Pressure Brass and Bronze Threaded Pipe Fittings
Use these fittings in low-pressure flow applications. They have good corrosion resistance. Fittings rated for use with drinking water meet NSF/ANSI 61 safety standards.
Locknuts thread onto the male end of a fitting to provide extra holding power so the fitting won’t loosen from vibration.
NPSL (National Pipe Straight Locknut) threads are compatible with NPT threads.
For technical drawings and 3-D models, click on a part number.
- For Use With: See table
- Pressure Class: See table
- Specifications Met: See table
- Pipe Nipples and Pipe: See table
- Flanges: See table
For Pipe | For Flange | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Pipe Size | Max. Pressure | Pressure Class | Material | Schedule | Material | Class | Material | For Use With | Specifications Met | Each | |
NPSL Female | |||||||||||
| 3/8 | 200 psi @ 72° F | 125 | Brass | 40 | Brass | 150 | Brass | Air, Drinking Water, Natural Gas, Oil | ASME B1.20.1, ASME B16.15, ASTM A584, NSF/ANSI 61 | 00000000 | 00000 |
Plastic Pipe Fittings for Gasoline
Use these plastic fittings to connect gasoline fuel lines to machines and equipment. They have excellent corrosion resistance as well as high strength and impact resistance. Apply a non-hardening, plastic-compatible sealant to the male threads to prevent leaks. Tape or sealants with PTFE are not recommended for plastic-to-plastic threaded connections. When making a threaded connection be careful not to overtighten the threads. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.
Plugs with fluoroelastomer gaskets, also known as Viton® fluoroelastomer gaskets, ensure a tight seal. They also resist a wide range of chemicals, including benzene, butyl alcohol, and ethylene glycol.
Warning: Never use plastic pipe fittings and pipe with compressed air or gas.
Sealants cannot be sold to Colorado, Connecticut, District of Columbia, Delaware, Illinois, Indiana, Massachusetts, Maryland, Maine, Michigan, New Hampshire, New Jersey, Northern Virginia, New York, Ohio, Pennsylvania, Rhode Island, or Utah due to local VOC (Volatile Organic Compounds) regulations.
For technical drawings and 3-D models, click on a part number.
- For Use With: Gasoline
- Temperature Range:
Gray Plugs: -40° to 190° F
White Plugs: 32° to 160° F
Black Plugs: -20° to 210° F
| Pipe Size | Drive Size | Material | Color | Gasket Material | Max. Pressure | Features | Each | |
BSPP Threads | ||||||||
|---|---|---|---|---|---|---|---|---|
| 3/8 | 22 mm | Nylon Plastic | Black | Fluoroelastomer Rubber | Not Rated | Flange | 0000000 | 00000 |
Floor, Wall, and Ceiling Plates
Add a finishing touch to the area around protruding pipes with these corrosion-resistant plates, which are also known as escutcheons.
Plastic plates twist open to fit around pipe.
Steel and zinc plates hinge open and close tightly around pipe.
For technical drawings and 3-D models, click on a part number.