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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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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.
To prevent leaks in threaded connections, apply a sealant to the male threads. Threaded connections can be taken apart as needed for maintenance and repair. 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 Use With: Water
- Maximum Temperature: 180° F
- Pipe Nipples and Pipe: Use Schedule 40 PVC Plastic
- Flanges: Use Class 150 PVC Plastic
Through-wall fittings are also known as bulkhead couplings and panel-mount couplings; they mount through your wall or panel to create an inlet or outlet.
| Pipe Size | Thread Size | For Hole Dia. | For Max. Wall Thick. | Material | Comparable To | Color | Max. Pressure | Each | |
NPT Threads | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| 1/16 | __ | 1/2" | 3/16" | Acetal Plastic | Delrin® Acetal Resin | White | 120 psi @ 72° F | 0000000 | 000000 |
| 1/8 | __ | 5/8" | 1/8" | Acetal Plastic | Delrin® Acetal Resin | Black | 120 psi @ 72° F | 0000000 | 00000 |
| 1/4 | __ | 3/4" | 1/4" | Acetal Plastic | Delrin® Acetal Resin | Black | 120 psi @ 72° F | 0000000 | 00000 |
| 3/8 | __ | 7/8" | 5/16" | Acetal Plastic | Delrin® Acetal Resin | Black | 120 psi @ 72° F | 0000000 | 00000 |
UNF Threads | |||||||||
| __ | 10-32 | 1/2" | 3/16" | Acetal Plastic | Delrin® Acetal Resin | White | 120 psi @ 72° F | 0000000 | 00000 |
| __ | 1/4"-28 | 1/2" | 3/16" | Acetal Plastic | Delrin® Acetal Resin | White | 120 psi @ 72° F | 0000000 | 00000 |
Plastic Pipe Fittings for Food and Beverage
Made of either nylon or acetal, these fittings resist corrosion, so they won't deteriorate in food processing applications. They won’t transfer tastes or odors to your food or beverages. Since these fittings are threaded, you can take apart their connections for maintenance and repair. When connecting to another fitting, 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 threading together fittings, be careful not to overtighten them. To prevent cracks and leaks, finger tighten the fitting, then wrench-tighten one to two turns.
Acetal plugs have excellent moisture resistance, so they won’t soften or lose strength, even in high-humidity environments.
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 Use With: Beverage, Dairy, Food
- Temperature Range:
Nylon Plastic: 0° to 230° F
Acetal Plastic: -30° to 140° F - Specifications Met:
Nylon Plastic: FDA Compliant 21 CFR 177.1500
Acetal Plastic: ASTM D6778
Wear-Resistant Easy-to-Machine Delrin® Acetal Resin Tubes

- Color: White or Black
- Temperature Range:
6" Lengths: 0° to 180° F
All other sizes: -20° to 180° F - Tensile Strength: 7,690 psi (Good)
- Impact Strength: 1-1.5 ft.-lbs./in. (Poor)
- Hardness: Rockwell R120-R122 (Hard)
- For Use Outdoors: No
- Specifications Met: See table
Easy to machine to close tolerances, these dimensionally stable tubes resist expanding when exposed to heat and moisture. They have a naturally slippery surface along with excellent wear resistance. Use them to make precision gears, bushings, and bearings. Delrin® acetal resin, also known as acetal homopolymer, is stronger and stiffer than acetal copolymer.
Tight-tolerance tubes that are 6” long are also known as bushing stock. You can slide them over rods to increase the OD, or into shafts to decrease the ID. Their precise sizing also allows ascending sizes to fit inside of each other to increase the wall thickness.
Tubes with an oversized OD also have an undersized ID for finishing to the sizes listed.
White | |||||||
|---|---|---|---|---|---|---|---|
| OD | OD Tolerance | ID | ID Tolerance | Specifications Met | Lengths, ft. | Per Ft. | |
1/32" Wall Thick. (-0.01" to 0.01") | |||||||
| 1/8" | -0.010" to 0.010" | 1/16" | -0.010" to 0.010" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 3/16" | -0.010" to 0.010" | 1/8" | -0.010" to 0.010" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
1/16" Wall Thick. (-0.01" to 0.01") | |||||||
| 1/4" | -0.010" to 0.010" | 1/8" | -0.010" to 0.010" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 3/8" | -0.010" to 0.010" | 1/4" | -0.010" to 0.010" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 1/2" | -0.010" to 0.010" | 3/8" | -0.010" to 0.010" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 5/8" | -0.010" to 0.010" | 1/2" | -0.010" to 0.010" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 3/4" | -0.010" to 0.010" | 5/8" | -0.010" to 0.010" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 7/8" | -0.010" to 0.010" | 3/4" | -0.010" to 0.010" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
1/8" Wall Thick. (-0.01" to 0.01") | |||||||
| 5/8" | -0.010" to 0.010" | 3/8" | -0.010" to 0.010" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 3/4" | -0.010" to 0.010" | 1/2" | -0.010" to 0.010" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 7/8" | -0.010" to 0.010" | 5/8" | -0.010" to 0.010" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 1" | -0.010" to 0.010" | 3/4" | -0.010" to 0.010" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
White | |||||||
|---|---|---|---|---|---|---|---|
| OD | OD Tolerance | ID | ID Tolerance | Specifications Met | Lg. | Each | |
1/8" Wall Thick. (-0.005" to 0.005") | |||||||
| 1/2" | -0.005" to 0.005" | 1/4" | -0.005" to 0.005" | ASTM D4181, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 6" | 0000000 | 000000 |
| 3/4" | -0.005" to 0.005" | 1/2" | -0.005" to 0.005" | ASTM D4181, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 6" | 0000000 | 00000 |
| 1" | -0.005" to 0.005" | 3/4" | -0.005" to 0.005" | ASTM D4181, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 6" | 0000000 | 00000 |
| 1 1/4" | -0.005" to 0.005" | 1" | -0.005" to 0.005" | ASTM D4181, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 6" | 0000000 | 00000 |
| 1 1/2" | -0.005" to 0.005" | 1 1/4" | -0.005" to 0.005" | ASTM D4181, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 6" | 0000000 | 000000 |
| 1 3/4" | -0.005" to 0.005" | 1 1/2" | -0.005" to 0.005" | ASTM D4181, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 6" | 0000000 | 000000 |
| 2" | -0.005" to 0.005" | 1 3/4" | -0.005" to 0.005" | ASTM D4181, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 6" | 0000000 | 000000 |
| 2 1/4" | -0.005" to 0.005" | 2" | -0.005" to 0.005" | ASTM D4181, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 6" | 0000000 | 000000 |
| 2 1/2" | -0.005" to 0.005" | 2 1/4" | -0.005" to 0.005" | ASTM D4181, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 6" | 0000000 | 000000 |

| OD | ID | Lengths, ft. | Specifications Met | Per Ft. | |
White | |||||
|---|---|---|---|---|---|
1/16" Wall Thick. | |||||
| 1/4" | 1/8" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 5/8" | 1/2" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
1/8" Wall Thick. | |||||
| 1/2" | 1/4" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 3/4" | 1/2" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 7/8" | 5/8" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 1 1/4" | 1" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 1 1/2" | 1 1/4" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 1 3/4" | 1 1/2" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 2" | 1 3/4" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 2 1/4" | 2" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
3/16" Wall Thick. | |||||
| 5/8" | 1/4" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
1/4" Wall Thick. | |||||
| 3/4" | 1/4" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 1" | 1/2" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 1 1/4" | 3/4" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 1 1/2" | 1" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 1 3/4" | 1 1/4" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 2" | 1 1/2" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 2 1/2" | 2" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
Black | |||||
1/16" Wall Thick. | |||||
| 1/4" | 1/8" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 5/8" | 1/2" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
1/8" Wall Thick. | |||||
| 1/2" | 1/4" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 3/4" | 1/2" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 7/8" | 5/8" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 1 1/4" | 1" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 1 1/2" | 1 1/4" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 1 3/4" | 1 1/2" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 2" | 1 3/4" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 2 1/4" | 2" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
3/16" Wall Thick. | |||||
| 5/8" | 1/4" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
1/4" Wall Thick. | |||||
| 3/4" | 1/4" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 0000 | |
| 1" | 1/2" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 1 1/4" | 3/4" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 1 1/2" | 1" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 1 3/4" | 1 1/4" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 2" | 1 1/2" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
| 2 1/2" | 2" | ASTM D6778, FDA Compliant 21 CFR 177.2480, NSF/ANSI 51 | 00000000 | 00000 | |
Slippery Wear-Resistant Easy-to-Machine Delrin® Acetal AF Resin Tubes
- Color: Brown
- Temperature Range: -40° to 185° F
- Tensile Strength: 7,690-8,100 psi (Good)
- Impact Strength: 0.7-1 ft.-lbs./in. (Poor)
- Hardness: Rockwell R115-R118 (Hard)
- For Use Outdoors: No
- Specifications Met: See table
PTFE is added to these Delrin® acetal resin tubes to make the surface even more slippery and wear resistant. They resist expanding when exposed to heat and moisture, so they can be machined to close tolerances. Fabricate them into pump components, gears, and bearings. The OD is oversized and the ID is undersized for finishing to the sizes listed. Delrin® acetal resin is also known as acetal homopolymer.

| OD | ID | Specifications Met | Lengths, ft. | Per Ft. | |
1/16" Wall Thick. | |||||
|---|---|---|---|---|---|
| 0.25" | 1/8" | ASTM D6778, UL 94 HB | 0000000 | 00000 | |
| 0.625" | 1/2" | ASTM D6778, UL 94 HB | 0000000 | 00000 | |
1/8" Wall Thick. | |||||
| 0.5" | 1/4" | ASTM D6778, UL 94 HB | 0000000 | 00000 | |
| 0.75" | 1/2" | ASTM D6778, UL 94 HB | 0000000 | 00000 | |
| 1.25" | 1" | ASTM D6778, UL 94 HB | 0000000 | 00000 | |
3/16" Wall Thick. | |||||
| 0.625" | 1/4" | ASTM D6778, UL 94 HB | 0000000 | 00000 | |
1/4" Wall Thick. | |||||
| 0.75" | 1/4" | ASTM D6778, UL 94 HB | 0000000 | 00000 | |
| 1" | 1/2" | ASTM D6778, UL 94 HB | 0000000 | 00000 | |
| 1.25" | 3/4" | ASTM D6778, UL 94 HB | 0000000 | 00000 | |
| 1.5" | 1" | ASTM D6778, UL 94 HB | 0000000 | 00000 | |
| 2" | 1 1/2" | ASTM D6778, UL 94 HB | 0000000 | 00000 | |

























