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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High-Pressure Iron and Steel Threaded Pipe Fittings
These fittings can stand up to high-pressure applications. Use them in noncorrosive environments.
Tee outlets allow you to create a threaded outlet anywhere along a pipe. They are also known as branch connectors and are comparable to Thredolet. To install, drill a hole in your pipe to match the fitting’s pipe size and weld in place.
Phosphate-coated and zinc-phosphate-coated fittings offer some corrosion resistance, but aren't intended for corrosive environments.
For technical drawings and 3-D models, click on a part number.

- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Specifications Met : ASME B31.1, ASTM A105, ASME B31.3, MSS SP-97, ASME B16.9, ASME B16.11
- Pipe Nipples and Pipe: Use Schedule 160 steel
- Flanges: Use Class 1500 steel
Pipe Size | Dash Size | For Pipe Size | Construction | Max. Pressure | Max. Steam Pressure | Material | Each | |
NPT Female × Butt Weld | ||||||||
---|---|---|---|---|---|---|---|---|
1/4 | 04 | 1/4 to 3/8 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 000000 |
1/4 | 04 | 1/2 to 36 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 0000000 | 00000 |
3/8 | 06 | 3/8 to 1 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 00000 |
3/8 | 06 | 1 1/4 to 36 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 0000000 | 00000 |
1/2 | 08 | 1/2 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 00000 |
1/2 | 08 | 3/4 to 36 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 0000000 | 00000 |
3/4 | 12 | 3/4 to 1 1/4 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 00000 |
3/4 | 12 | 1 1/2 to 36 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 0000000 | 00000 |
1 | 16 | 1 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 00000 |
1 | 16 | 1 1/4 to 2 1/2 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 00000 |
1 | 16 | 3 to 36 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 0000000 | 00000 |
1 1/4 | 20 | 1 1/4 to 1 1/2 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 00000 |
1 1/4 | 20 | 2 to 3 1/2 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 00000 |
1 1/4 | 20 | 4 to 36 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 0000000 | 00000 |
1 1/2 | 24 | 1 1/2 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 00000 |
1 1/2 | 24 | 2 to 2 1/2 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 00000 |
1 1/2 | 24 | 3 to 5 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 00000 |
1 1/2 | 24 | 6 to 36 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 0000000 | 00000 |
2 | 32 | 2 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 00000 |
2 | 32 | 2 1/2 to 3 1/2 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 00000 |
2 | 32 | 4 to 6 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 00000000 | 00000 |
2 | 32 | 8 to 36 | Seamless | 3,000 psi @ 72° F | 300 psi @ 360° F | Zinc-Phosphate-Coated Steel | 0000000 | 00000 |
High-Pressure Socket-Connect Steel Unthreaded Pipe Fittings
Socket-connect fittings are easier to weld than butt-weld fittings because the fitting doesn’t need to align perfectly to the pipe. Slide pipe into the socket and weld for a strong, permanent connection. Fittings have heavy duty construction that stands up to high-pressure applications. They are for use in noncorrosive environments.
Tee outlets allow you to create a tap anywhere along a pipe. They are also known as branch connectors and are comparable to Sockolet. To install, drill a hole in your pipe to match the fitting’s pipe size and weld in place.
For technical drawings and 3-D models, click on a part number.


- For Use With: Air, Hydraulic Fluid, Natural Gas, Oil, Steam, Water
- Specifications Met: ASME B31.1, ASME B31.3, ASTM A105, MSS SP-97, ASME B16.9, ASME B16.11
- Pipe Nipples and Pipe: Use Schedule 80 steel
- Flanges: Use Class 300 and 600 steel
Pipe Size | Dash Size | For Pipe Size | Ht. | Max. Pressure | Max. Steam Pressure | Material | Each | |
1/4 | 04 | 1/4 | 3/4" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 000000 |
1/4 | 04 | 3/8 to 36 | 3/4" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
3/8 | 06 | 3/8 to 1/2 | 7/8" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
3/8 | 06 | 3/4 to 36 | 7/8" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
1/2 | 08 | 1/2 | 1" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
1/2 | 08 | 3/4 to 36 | 1" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
3/4 | 12 | 1 1/2 to 36 | 1 1/8" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
3/4 | 12 | 3/4 to 1 1/4 | 1 1/8" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
1 | 16 | 1 1/4 to 2 1/2 | 1 3/8" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
1 | 16 | 1 | 1 3/8" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
1 | 16 | 3 to 36 | 1 3/8" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
1 1/4 | 20 | 1 1/4 to 1 1/2 | 1 3/8" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
1 1/4 | 20 | 2 to 3 1/2 | 1 3/8" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
1 1/4 | 20 | 4 to 36 | 1 3/8" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
1 1/2 | 24 | 6 to 36 | 1 3/8" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
1 1/2 | 24 | 1 1/2 | 1 3/8" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
1 1/2 | 24 | 2 to 2 1/2 | 1 3/8" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
1 1/2 | 24 | 3 to 5 | 1 3/8" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
2 | 32 | 4 to 6 | 1 1/2" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 00000000 | 00000 |
2 | 32 | 8 to 36 | 1 1/2" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
2 | 32 | 2 | 1 1/2" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
2 | 32 | 2 1/2 to 3 1/2 | 1 1/2" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 00000 |
Standard-Wall Butt-Weld Steel Unthreaded Pipe Fittings
Butt-weld fittings allow for a smooth connection that provides maximum flow. They have beveled ends that, when flush to pipe, create a trough for a strong, permanent weld. Fittings are also known as Schedule 40. They are for use in noncorrosive environments.
Tee outlets allow you to create a tap anywhere along a pipe. They are known as branch connectors and are comparable to Weldolet. To install, drill a hole in your pipe to match the fitting's pipe size and weld in place.
For technical drawings and 3-D models, click on a part number.


- For Use With: Air, Natural Gas, Oil, Steam, Water
- Specifications Met: ASTM A105, MSS SP-97
- Pipe Nipples and Pipe: Use Schedle 80 steel
Pipe Size (Wall Thick.) | For Pipe Size (Wall Thick.) | Height | Construction | Maximum Pressure | Maximum Steam Pressure | Each | |
1/4 (0.088") | 1/4 to 3/8 (0.256") | 5/8" | Seamless | 3,000 psi @ 72° F | 3,000 psi @ 210° F | 0000000 | 000000 |
1/4 (0.088") | 1/2 to 36 (0.256") | 5/8" | Seamless | 3,000 psi @ 72° F | 3,000 psi @ 210° F | 0000000 | 00000 |
3/8 (0.091") | 3/8 to 1/2 (0.285") | 3/4" | Seamless | 3,000 psi @ 72° F | 3,000 psi @ 210° F | 0000000 | 00000 |
3/8 (0.091") | 3/4 to 36 (0.285") | 3/4" | Seamless | 3,000 psi @ 72° F | 3,000 psi @ 210° F | 0000000 | 00000 |
1/2 (0.109") | 3/4 to 36 (0.314") | 3/4" | Seamless | 3,000 psi @ 72° F | 3,000 psi @ 210° F | 0000000 | 00000 |
1/2 (0.109") | 1/2 (0.314") | 3/4" | Seamless | 3,000 psi @ 72° F | 3,000 psi @ 210° F | 0000000 | 00000 |
3/4 (0.113") | 1 1/2 to 36 (0.338") | 7/8" | Seamless | 3,000 psi @ 72° F | 3,000 psi @ 210° F | 0000000 | 00000 |
3/4 (0.113") | 3/4 to 1 1/4 (0.338") | 7/8" | Seamless | 3,000 psi @ 72° F | 3,000 psi @ 210° F | 0000000 | 00000 |
1 (0.133") | 1 1/4 to 2 1/2 (0.382") | 1 1/16" | Seamless | 3,000 psi @ 72° F | 3,000 psi @ 210° F | 0000000 | 00000 |
1 (0.133") | 3 to 36 (0.382") | 1 1/16" | Seamless | 3,000 psi @ 72° F | 3,000 psi @ 210° F | 0000000 | 00000 |
1 (0.133") | 1 (0.382") | 1 1/16" | Seamless | 3,000 psi @ 72° F | 3,000 psi @ 210° F | 0000000 | 00000 |
1 1/4 (0.14") | 1 1/4 to 1 1/2 (0.435") | 1 1/4" | Seamless | 3,000 psi @ 72° F | 3,000 psi @ 210° F | 0000000 | 00000 |
1 1/4 (0.14") | 2 to 3 1/2 (0.435") | 1 1/4" | Seamless | 3,000 psi @ 72° F | 3,000 psi @ 210° F | 0000000 | 00000 |
1 1/4 (0.14") | 4 to 36 (0.435") | 1 1/4" | Seamless | 3,000 psi @ 72° F | 3,000 psi @ 210° F | 0000000 | 00000 |
1 1/2 (0.145") | 1 1/2 (0.445") | 1 5/16" | Seamless | 2,800 psi @ 72° F | 2,800 psi @ 210° F | 0000000 | 00000 |
1 1/2 (0.145") | 2 to 2 1/2 (0.445") | 1 5/16" | Seamless | 2,800 psi @ 72° F | 2,800 psi @ 210° F | 0000000 | 00000 |
1 1/2 (0.145") | 3 to 5 (0.445") | 1 5/16" | Seamless | 2,800 psi @ 72° F | 2,800 psi @ 210° F | 0000000 | 00000 |
1 1/2 (0.145") | 6 to 36 (0.445") | 1 5/16" | Seamless | 2,800 psi @ 72° F | 2,800 psi @ 210° F | 0000000 | 00000 |
2 (0.154") | 2 1/2 to 3 1/2 (0.467") | 1 1/2" | Seamless | 2,300 psi @ 72° F | 2,300 psi @ 210° F | 0000000 | 00000 |
2 (0.154") | 4 to 6 (0.467") | 1 1/2" | Seamless | 2,300 psi @ 72° F | 2,300 psi @ 210° F | 0000000 | 00000 |
2 (0.154") | 8 to 36 (0.467") | 1 1/2" | Seamless | 2,300 psi @ 72° F | 2,300 psi @ 210° F | 0000000 | 00000 |
2 (0.154") | 2 (0.467") | 1 1/2" | Seamless | 2,300 psi @ 72° F | 2,300 psi @ 210° F | 0000000 | 000000 |
Standard-Wall Plastic Pipe Fittings for Water
Connect these fittings to Schedule 40 plastic pipe–they are the industry standard for residential and commercial low-pressure plumbing and water supply applications. They are plastic for good corrosion resistance.
Fittings for drinking water meet NSF/ANSI Standard 61.
Attach socket-connect ends to unthreaded pipe or another socket-connect fitting with a PVC primer and cement (also known as solvent weld).
To prevent leaks in threaded connections, apply a sealant to the male threads. For plastic threads, apply a non-hardening, plastic-compatible sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic connections. Fittings that meet ASTM D1784, ASTM D1785, and ASTM D4066 adhere to specifications and testing requirements for material quality.
Note: For fittings that are not rated for pressure, you can use the pressure rating of the plastic pipe as a reference. Threaded fittings are limited to 50% of the rated pressure of the pipe.
Warning: Never use plastic pipe fittings and pipe with compressed air or gas.
For technical drawings and 3-D models, click on a part number.

- For Use With: Drinking Water, Water
- Maximum Temperature: 140° F
- Specifications Met: ASTM D1784, NSF/ANSI 61
- Pipe Nipples and Pipe: Use Schedule 40 Aluminum, Iron, PVC Plastic, Stainless Steel, Steel
- Flanges: Use Schedule 40 PVC Plastic
Saddle-tap tee adapters allow you to create additional outlets and connections in metal or plastic pipe. To install, shut down your line and drill a hole in the pipe where you want to create a connection. Position the saddle over the hole so the gasket and lip are fully engaged and secure with the included nuts, bolts, and washers.
Pipe Size | Socket Depth | For Pipe Size | For Pipe OD | For Hole Dia. | OD | ID | Wall Thick. | Material | Color | Max. Pressure | Each | |
1 1/2 | 1/2" | 4 | 4 1/2" | 1 3/4" | 1 29/32" | 1.61" | 0.145" | PVC Plastic | White | 200 psi @ 72° F | 0000000 | 0000000 |
1 1/2 | 29/32" | 3 | 3 1/2" | 2 1/4" | 1 29/32" | 1.61" | 0.145" | PVC Plastic | White | 200 psi @ 72° F | 0000000 | 00000 |
2 | 3/8" | 3 | 3 1/2" | 2 1/4" | 2 3/8" | 2.067" | 0.154" | PVC Plastic | White | 200 psi @ 72° F | 0000000 | 00000 |
2 | 7/16" | 4 | 4 1/2" | 2 1/4" | 2 3/8" | 2.067" | 0.154" | PVC Plastic | White | 200 psi @ 72° F | 0000000 | 000000 |
2 | 11/16" | 6 | 6 5/8" | 2 1/4" | 2 3/8" | 2.067" | 0.154" | PVC Plastic | White | 200 psi @ 72° F | 0000000 | 000000 |
3 | 1/2" | 4 | 4 1/2" | 3" | 3 1/2" | 3.068" | 0.216" | PVC Plastic | White | 200 psi @ 72° F | 0000000 | 000000 |

- For Use With: Drinking Water, Water
- Maximum Temperature: 140° F
- Specifications Met: ASTM D1784, NSF/ANSI 61
- Pipe Nipples and Pipe: Use Schedule 40 Aluminum, Iron, PVC Plastic, Stainless Steel, Steel
- Flanges: Use Schedule 40 PVC Plastic
Fittings with stainless steel collar have a reinforcement on the female threads to prevent the threads from cracking.
Saddle-tap tee adapters allow you to create additional outlets and connections in metal or plastic pipe. To install, shut down your line and drill a hole in the pipe where you want to create a connection. Position the saddle over the hole so the gasket and lip are fully engaged and secure with the included nuts, bolts, and washers.
Pipe Size | Socket Depth | For Pipe Size | For Pipe OD | For Hole Dia. | OD | ID | Wall Thick. | Material | Collar Material | Color | Max. Pressure | Each | |
NPT Threads | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1/2 | 5/16" | 2 | 2 3/8" | 3/4" | 27/32" | 0.622" | 0.109" | PVC Plastic | Stainless Steel | White | 200 psi @ 72° F | 0000000 | 000000 |
3/4 | 5/16" | 2 | 2 3/8" | 7/8" | 1 3/64" | 0.824" | 0.113" | PVC Plastic | Stainless Steel | White | 200 psi @ 72° F | 0000000 | 00000 |
3/4 | 27/32" | 4 | 4 1/2" | 1 1/8" | 1 3/64" | 0.824" | 0.113" | PVC Plastic | Stainless Steel | White | 200 psi @ 72° F | 0000000 | 000000 |
1 | 5/16" | 2 | 2 3/8" | 1 1/8" | 1 5/16" | 1.049" | 0.133" | PVC Plastic | Stainless Steel | White | 200 psi @ 72° F | 0000000 | 00000 |
1 | 7/16" | 4 | 4 1/2" | 1 1/8" | 1 5/16" | 1.049" | 0.133" | PVC Plastic | Stainless Steel | White | 200 psi @ 72° F | 0000000 | 000000 |
2 | 11/16" | 6 | 6 5/8" | 2 1/4" | 2 3/8" | 2.067" | 0.154" | PVC Plastic | Stainless Steel | White | 200 psi @ 72° F | 0000000 | 000000 |
Thick-Wall Plastic Pipe Fittings for Water
Connect these fittings to Schedule 80 pipe–they have thicker, stronger walls than standard-wall fittings so they can handle heavy duty industrial plumbing and water supply applications, such as water processing, waste water treatment, and irrigation. Fittings are plastic for good corrosion resistance. They meet ASTM specifications and testing requirements for material quality.
Fittings for drinking water meet NSF/ANSI Standard 61.
To prevent leaks in threaded connections, apply a sealant to the male threads. For plastic threads, apply a non-hardening, plastic-compatible sealant. Tape or sealants with PTFE are not recommended for plastic-to-plastic connections.
Note: For fittings that are not rated for pressure, you can use the pressure rating of the plastic pipe as a reference. Threaded fittings are limited to 50% of the rated pressure of the pipe.
Warning: Never use plastic pipe fittings and pipe with compressed air or gas.
For technical drawings and 3-D models, click on a part number.

- For Use With: Drinking Water, Water
- Maximum Temperature: 140° F
- Specifications Met: ASTM D1784, NSF/ANSI 61
- Pipe Nipples and Pipe: Use Schedule 80 Aluminum, Iron, PVC Plastic, Stainless Steel, Steel
- Flanges: Use Class 150 PVC Plastic
Saddle-tap tee adapters allow you to create additional outlets and connections in metal or plastic pipe. To install, shut down your line and drill a hole in the pipe where you want to create a connection. Position the saddle over the hole so the gasket and lip are fully engaged and secure with the included nuts, bolts, and washers.
Pipe Size | For Pipe Size | For Pipe OD | For Hole Dia. | Material | Collar Material | Color | Max. Pressure | Each | |
NPT Threads | |||||||||
---|---|---|---|---|---|---|---|---|---|
1/2 | 2 | 2 3/8" | 3/4" | PVC Plastic | Stainless Steel | Dark Gray | 200 psi @ 72° F | 0000000 | 000000 |
1/2 | 3 | 3 1/2" | 7/8" | PVC Plastic | Stainless Steel | Dark Gray | 200 psi @ 72° F | 0000000 | 00000 |
1/2 | 4 | 4 1/2" | 1 1/8" | PVC Plastic | Stainless Steel | Dark Gray | 200 psi @ 72° F | 0000000 | 000000 |
3/4 | 2 | 2 3/8" | 7/8" | PVC Plastic | Stainless Steel | Dark Gray | 200 psi @ 72° F | 0000000 | 00000 |
3/4 | 3 | 3 1/2" | 7/8" | PVC Plastic | Stainless Steel | Dark Gray | 200 psi @ 72° F | 0000000 | 00000 |
3/4 | 4 | 4 1/2" | 1 1/8" | PVC Plastic | Stainless Steel | Dark Gray | 200 psi @ 72° F | 0000000 | 000000 |
1 | 2 | 2 3/8" | 1 1/8" | PVC Plastic | Stainless Steel | Dark Gray | 200 psi @ 72° F | 0000000 | 00000 |
1 | 3 | 3 1/2" | 1 1/8" | PVC Plastic | Stainless Steel | Dark Gray | 200 psi @ 72° F | 0000000 | 00000 |
1 | 4 | 4 1/2" | 1 1/8" | PVC Plastic | Stainless Steel | Dark Gray | 200 psi @ 72° F | 0000000 | 000000 |
1 1/2 | 3 | 3 1/2" | 2 1/4" | PVC Plastic | Stainless Steel | Dark Gray | 200 psi @ 72° F | 0000000 | 00000 |
1 1/2 | 4 | 4 1/2" | 1 3/4" | PVC Plastic | Stainless Steel | Dark Gray | 200 psi @ 72° F | 0000000 | 000000 |
2 | 4 | 4 1/2" | 2 1/4" | PVC Plastic | Stainless Steel | Dark Gray | 200 psi @ 72° F | 0000000 | 000000 |
2 | 6 | 6 5/8" | 2 1/4" | PVC Plastic | Stainless Steel | Dark Gray | 200 psi @ 72° F | 0000000 | 000000 |