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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Thick-Wall Galvanized Iron and Steel Threaded Pipe Nipples and Pipe
Made of galvanized iron or steel, this pipe has fair corrosion resistance. It has thick, Schedule 80 walls for good strength in medium-pressure applications.
Seamless pipe has a smooth interior for unrestricted flow and is stronger than welded pipe.
Straight reducers are also known as swage nipples.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Natural Gas, Nitrogen Gas, Oil, Steam, Water
- Specifications Met: ASTM B633, ASTM A234, MSS SP-95, ASME B1.20.1
- Fittings: Use Class 300 iron or steel
- Flanges: Use Class 300 steel
Pipe Size | |||||||
---|---|---|---|---|---|---|---|
(A) | (B) | Lg. | Thread Type | Construction | Material | Each | |
1/4 | 1/8 | 2 1/4" | NPT | Seamless | Galvanized Steel | 00000000 | 000000 |
3/8 | 1/4 | 2 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1/2 | 1/8 | 2 3/4" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1/2 | 1/4 | 2 3/4" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1/2 | 3/8 | 2 3/4" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
3/4 | 1/8 | 3" | NPT | Seamless | Galvanized Iron | 00000000 | 00000 |
3/4 | 1/4 | 3" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
3/4 | 1/2 | 3" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1 | 1/8 | 3 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1 | 1/4 | 3 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1 | 3/8 | 3 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1 | 1/2 | 3 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1 | 3/4 | 3 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1 1/4 | 1/2 | 4" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1 1/4 | 3/4 | 4" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1 1/4 | 1 | 4" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1 1/2 | 1/2 | 4 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1 1/2 | 3/4 | 4 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1 1/2 | 1 | 4 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
1 1/2 | 1 1/4 | 4 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
2 | 1/4 | 6 1/2" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
2 | 1/2 | 6 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 000000 |
2 | 3/4 | 6 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 000000 |
2 | 1 | 6 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
2 | 1 1/4 | 6 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 000000 |
2 | 1 1/2 | 6 1/2" | NPT | Seamless | Galvanized Steel | 00000000 | 00000 |
2 1/2 | 3/4 | 7" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
2 1/2 | 1 | 7" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
2 1/2 | 1 1/4 | 7" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
2 1/2 | 1 1/2 | 7" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
2 1/2 | 2 | 7" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
3 | 1/2 | 8" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
3 | 3/4 | 8" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
3 | 1 | 8" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
3 | 1 1/4 | 8" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
3 | 1 1/2 | 8" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
3 | 2 | 8" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
3 | 2 1/2 | 8" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
4 | 1/2 | 9" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
4 | 3/4 | 9" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
4 | 1 | 9" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
4 | 1 1/4 | 9" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
4 | 1 1/2 | 9" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
4 | 2 | 9" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
4 | 2 1/2 | 9" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
4 | 3 | 9" | NPT | Seamless | Galvanized Iron | 00000000 | 000000 |
Thick-Wall Stainless Steel Threaded Pipe Nipples and Pipe
Thick walls, also known as Schedule 80, give this pipe the strength to handle high-pressure applications. It is seamless so it has a smooth interior for unrestricted flow.
304 stainless steel pipe has very good corrosion resistance.
Straight reducers are also known as swage nipples.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Water, Hydraulic Fluid, Natural Gas, Oil, Steam
- Specifications Met: MSS SP-95, ASTM A403
- Fittings: Use Class 3000 stainless steel
- Flanges: Use Use Class 300 or 600 stainless steel
Pipe Size | Dash Size | |||||||
---|---|---|---|---|---|---|---|---|
(A) | (B) | (A) | (B) | Lg. | Thread Type | Construction | Each | |
3/8 | 1/4 | 06 | 04 | 2 1/2" | NPT | Seamless | 0000000 | 000000 |
1/2 | 1/4 | 08 | 04 | 2 3/4" | NPT | Seamless | 0000000 | 00000 |
1/2 | 3/8 | 08 | 06 | 2 3/4" | NPT | Seamless | 0000000 | 00000 |
3/4 | 1/4 | 12 | 04 | 3" | NPT | Seamless | 0000000 | 00000 |
3/4 | 3/8 | 12 | 06 | 3" | NPT | Seamless | 0000000 | 00000 |
3/4 | 1/2 | 12 | 08 | 3" | NPT | Seamless | 0000000 | 00000 |
1 | 1/4 | 16 | 04 | 3 1/2" | NPT | Seamless | 0000000 | 00000 |
1 | 3/8 | 16 | 06 | 3 1/2" | NPT | Seamless | 0000000 | 00000 |
1 | 1/2 | 16 | 08 | 3 1/2" | NPT | Seamless | 0000000 | 00000 |
1 | 3/4 | 16 | 12 | 3 1/2" | NPT | Seamless | 0000000 | 00000 |
1 1/4 | 3/4 | 20 | 12 | 4" | NPT | Seamless | 0000000 | 000000 |
1 1/4 | 1 | 20 | 16 | 4" | NPT | Seamless | 0000000 | 000000 |
1 1/2 | 1/2 | 24 | 08 | 4 1/2" | NPT | Seamless | 0000000 | 000000 |
1 1/2 | 3/4 | 24 | 12 | 4 1/2" | NPT | Seamless | 0000000 | 000000 |
1 1/2 | 1 | 24 | 16 | 4 1/2" | NPT | Seamless | 0000000 | 000000 |
1 1/2 | 1 1/4 | 24 | 20 | 4 1/2" | NPT | Seamless | 0000000 | 000000 |
2 | 1/2 | 32 | 08 | 6 1/2" | NPT | Seamless | 0000000 | 000000 |
2 | 3/4 | 32 | 12 | 6 1/2" | NPT | Seamless | 0000000 | 000000 |
2 | 1 | 32 | 16 | 6 1/2" | NPT | Seamless | 0000000 | 000000 |
2 | 1 1/4 | 32 | 20 | 6 1/2" | NPT | Seamless | 0000000 | 000000 |
2 | 1 1/2 | 32 | 24 | 6 1/2" | NPT | Seamless | 0000000 | 000000 |
UV-Resistant Polypropylene Pipe Fittings for Chemicals
Made of polypropylene, these fittings won’t deteriorate when exposed to the damaging effects of ultraviolet light and are suitable to use outdoors. They have the chemical resistance to withstand a wide variety of acids, solvents, and other harsh substances. 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.
Schedule 80 fittings have thicker, stronger walls than Schedule 40 fittings for heavy duty, industrial chemical processing applications.
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: Acetic Acid (5%), Calcium Chloride, Hydrochloric Acid (10%), Phosphoric Acid (85%), Salt Water, Sodium Hydroxide, Sulfuric Acid (30%), Water
- Temperature Range: See table
- Pipe Nipples and Pipe: Use Schedule 80 Polypropylene Plastic
- Flanges: Use Class 150 Polypropylene Plastic
Pipe Size (A) | Pipe Size (B) | Schedule | Material | Color | Max. Pressure | Temp. Range, °F | Each | |
NPT Threads | ||||||||
---|---|---|---|---|---|---|---|---|
1/2 | 3/8 | 80 | Polypropylene Plastic | Black | 300 psi @ 72° F | 0° to 150° | 000000000 | 00000 |
3/4 | 1/2 | 80 | Polypropylene Plastic | Black | 300 psi @ 72° F | 0° to 150° | 000000000 | 0000 |
1 | 1/2 | 80 | Polypropylene Plastic | Black | 300 psi @ 72° F | 0° to 150° | 000000000 | 0000 |
1 | 3/4 | 80 | Polypropylene Plastic | Black | 300 psi @ 72° F | 0° to 150° | 000000000 | 0000 |
1 1/4 | 3/4 | 80 | Polypropylene Plastic | Black | 300 psi @ 72° F | 0° to 150° | 000000000 | 0000 |
1 1/4 | 1 | 80 | Polypropylene Plastic | Black | 300 psi @ 72° F | 0° to 150° | 000000000 | 0000 |
1 1/2 | 1 | 80 | Polypropylene Plastic | Black | 300 psi @ 72° F | 0° to 150° | 000000000 | 0000 |
1 1/2 | 1 1/4 | 80 | Polypropylene Plastic | Black | 300 psi @ 72° F | 0° to 150° | 000000000 | 0000 |
2 | 1 1/4 | 80 | Polypropylene Plastic | Black | 300 psi @ 72° F | 0° to 150° | 000000000 | 0000 |
2 | 1 1/2 | 80 | Polypropylene Plastic | Black | 300 psi @ 72° F | 0° to 150° | 000000000 | 0000 |
3 | 2 | 80 | Polypropylene Plastic | Black | 300 psi @ 72° F | 0° to 150° | 000000000 | 00000 |
Non-Hardening Thread Sealant (8-oz. Brush-Top Can) | 000000 | Each | 000000 |
Crack-Resistant PFA Pipe Fittings for Chemicals
- For Use With: Acetic Acid, Alcohol, Salt Water
- Max. Temperature: 150° F
Not only do these PFA fittings have the chemical resistance to handle acid and salt water, they also have better crack resistance than other plastic pipe fittings for chemicals. Also known as Schedule 80 fittings, they have thick, strong walls to handle heavy duty chemical processing applications. Fittings have a super-smooth interior for unrestricted flow. They are commonly used in high-purity chemical flow processes, such as semiconductor and clean room applications, because the material won’t leach contaminates into the line. 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 connect, finger tighten the fitting, then wrench-tighten one to two turns.
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.
Pipe Size (A) | Pipe Size (B) | Material | Color | Max. Pressure | Each | |
NPT Threads | ||||||
---|---|---|---|---|---|---|
1/4 | 1/8 | PFA Plastic | White | 120 psi @ 72° F | 000000000 | 000000 |
3/8 | 1/4 | PFA Plastic | White | 120 psi @ 72° F | 000000000 | 00000 |
1/2 | 1/4 | PFA Plastic | White | 100 psi @ 72° F | 000000000 | 00000 |
1/2 | 3/8 | PFA Plastic | White | 100 psi @ 72° F | 000000000 | 00000 |
3/4 | 1/2 | PFA Plastic | White | 70 psi @ 72° F | 000000000 | 00000 |
Non-Hardening Thread Sealant (8-oz. Brush-Top Can) | 000000 | Each | 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: Water
- Maximum Temperature: 110° F
- Specifications Met: ASTM D1784
- Pipe Nipples and Pipe: Use Schedule 80 PVC Plastic
- Flanges: Use Class 150 PVC Plastic
Plastic Pipe Fittings for Oil
Made of corrosion-resistant plastic, these fittings won’t deteriorate when used in oil applications. They also have 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.
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: Oil
- Temperature Range: 0° to 230° F
Pipe Size | ||||||
---|---|---|---|---|---|---|
A | B | Material | Color | Max. Pressure | Each | |
NPT Threads | ||||||
1/4 | 1/8 | Nylon Plastic | Gray | 200 psi @ 72° F | 00000000 | 00000 |
3/8 | 1/8 | Nylon Plastic | Gray | 200 psi @ 72° F | 00000000 | 0000 |
3/8 | 1/4 | Nylon Plastic | Gray | 200 psi @ 72° F | 00000000 | 0000 |
1/2 | 1/8 | Nylon Plastic | Gray | 200 psi @ 72° F | 00000000 | 0000 |
1/2 | 1/4 | Nylon Plastic | Gray | 200 psi @ 72° F | 00000000 | 0000 |
1/2 | 3/8 | Nylon Plastic | Gray | 200 psi @ 72° F | 00000000 | 0000 |
3/4 | 1/4 | Nylon Plastic | Gray | 200 psi @ 72° F | 00000000 | 0000 |
3/4 | 3/8 | Nylon Plastic | Gray | 200 psi @ 72° F | 00000000 | 0000 |
3/4 | 1/2 | Nylon Plastic | Gray | 200 psi @ 72° F | 00000000 | 0000 |
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.
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: 32° to 160° F
Pipe Size (A) | Pipe Size (B) | Material | Color | Max. Pressure | Each | |
NPT Threads | ||||||
---|---|---|---|---|---|---|
3/8 | 1/4 | Nylon Plastic | White | 70 psi @ 72° F | 000000000 | 00000 |
1/2 | 1/4 | Nylon Plastic | White | 70 psi @ 72° F | 000000000 | 0000 |
1/2 | 3/8 | Nylon Plastic | White | 70 psi @ 72° F | 000000000 | 0000 |
3/4 | 3/8 | Nylon Plastic | White | 70 psi @ 72° F | 000000000 | 0000 |
3/4 | 1/2 | Nylon Plastic | White | 70 psi @ 72° F | 000000000 | 0000 |
1 1/4 | 1 | Nylon Plastic | White | 70 psi @ 72° F | 000000000 | 0000 |
Non-Hardening Thread Sealant (8-oz. Brush-Top Can) | 000000 | Each | 000000 |
Threaded Hose Fittings for Hydraulic Fluid
Fittings are threaded on both ends so you can connect them directly to a threaded hose or to pumps, cylinders, and other equipment in your hydraulic system.
Zinc-plated steel fittings are stronger and more durable than stainless steel fittings. They have fair corrosion resistance. BSPP threads have a gasket or a 60° internal flare to protect against leaks.
For technical drawings and 3-D models, click on a part number.