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 Socket-Connect Stainless Steel Unthreaded Pipe Fittings
Forged for excellent strength, these heavy duty socket-connect fittings stand up to high-pressure applications. They 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.
304 stainless steel fittings have very good corrosion resistance. 316 stainless steel fittings have excellent corrosion resistance.
Tee outlets allow you to create a tap anywhere along a pipe. They are also 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 A182
- Pipe Nipples and Pipe: Use Schedule 80 stainless steel
Pipe Size | For Pipe Size | Height | Max. Pressure | Max. Steam Pressure | Each | |
304/304L Stainless Steel | ||||||
|---|---|---|---|---|---|---|
Socket Connect × Butt Weld | ||||||
| 1/4 | 1/4 to 3/8 | 3/4" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 000000 |
| 1/4 | 1/2 to 36 | 3/4" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 00000 |
| 3/8 | 3/4 to 36 | 13/16" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 00000 |
| 1/2 | 1/2 | 1" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 00000 |
| 1/2 | 3/4 to 36 | 1" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 00000 |
| 3/4 | 1 1/2 to 36 | 1 1/16" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 00000 |
| 3/4 | 3/4 to 1 1/4 | 1 1/16" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 00000 |
| 1 | 1 1/4 to 2 1/2 | 1 5/16" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 00000 |
| 1 | 1 | 1 5/16" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 00000 |
| 1 | 3 to 36 | 1 5/16" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 00000 |
| 1 1/4 | 2 to 3 1/2 | 1 5/16" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 000000 |
| 1 1/2 | 6 to 36 | 1 3/8" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 000000 |
| 1 1/2 | 1 1/2 | 1 3/8" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 000000 |
| 1 1/2 | 2 to 2 1/2 | 1 3/8" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 000000 |
| 1 1/2 | 3 to 5 | 1 3/8" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 000000 |
| 2 | 4 to 6 | 1 1/2" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 000000 |
| 2 | 8 to 36 | 1 1/2" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 000000 |
| 2 | 2 | 1 1/2" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 000000 |
| 2 | 2 1/2 to 3 1/2 | 1 1/2" | 2,900 psi @ 72° F | 2,400 psi @ 212° F | 0000000 | 000000 |
316/316L Stainless Steel | ||||||
Socket Connect × Butt Weld | ||||||
| 1/4 | 1/4 to 3/8 | 3/4" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 00000 |
| 1/4 | 1/2 to 36 | 3/4" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 00000 |
| 3/8 | 3/4 to 36 | 13/16" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 00000 |
| 1/2 | 1/2 | 1" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 00000 |
| 1/2 | 3/4 to 36 | 1" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 00000 |
| 3/4 | 1 1/2 to 36 | 1 1/16" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 00000 |
| 3/4 | 3/4 to 1 1/4 | 1 1/16" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 00000 |
| 1 | 1 1/4 to 2 1/2 | 1 5/16" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 00000 |
| 1 | 1 | 1 5/16" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 00000 |
| 1 | 3 to 36 | 1 5/16" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 00000 |
| 1 1/2 | 6 to 36 | 1 3/8" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 000000 |
| 1 1/2 | 3 to 5 | 1 3/8" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 000000 |
| 2 | 4 to 6 | 1 1/2" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 000000 |
| 2 | 2 | 1 1/2" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 000000 |
| 2 | 2 1/2 to 3 1/2 | 1 1/2" | 2,900 psi @ 72° F | 2,480 psi @ 212° F | 0000000 | 000000 |
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 | 3/8 to 36 | 3/4" | 3,000 psi @ 72° F | 300 psi @ 360° F | Steel | 0000000 | 000000 |
| 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 | 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 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 PVC Plastic
- Flanges: Use Schedule 40 PVC Plastic
Tee outlet adapters allow you to create additional outlets and connections in plastic pipe. Use a PVC primer and cement to secure the tee outlet into position, then drill a hole through the fitting and pipe. They are also known as branch connectors.
| Pipe Size | For Pipe Size | Material | Color | Each | |
NPT Threads | |||||
|---|---|---|---|---|---|
| 1/8 | 1/2 | PVC Plastic | White | 00000000 | 00000 |
| 1/8 | 3/4 | PVC Plastic | White | 00000000 | 0000 |
| 1/2 | 1/2 | PVC Plastic | White | 00000000 | 0000 |
| 1/2 | 1 | PVC Plastic | White | 00000000 | 0000 |
| 1/2 | 3/4 | PVC Plastic | White | 00000000 | 0000 |
| 3/4 | 1 | PVC Plastic | White | 00000000 | 0000 |
| 3/4 | 3/4 | PVC Plastic | White | 00000000 | 0000 |
| 1 | 1 | PVC Plastic | White | 00000000 | 0000 |