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.
More
About Duct Connections
More
Standard Duct and Fittings
No need for clamps or connectors—duct and fittings press-fit together. Male ends are crimped or tapered, making them slightly smaller than a female end for simple assembly.
Galvanized steel has good corrosion resistance. Aluminum is more lightweight than steel and stainless steel and has good corrosion resistance. 304 stainless steel is more corrosion resistant than steel and aluminum.
For technical drawings and 3-D models, click on a part number.
Galvanized Steel | Aluminum | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Duct Size | Female ID | Male OD | Includes | End Construction | Gauge | Each | Gauge | Each | ||
Exhaust Vent | ||||||||||
| 3 | 3" | __ | Damper | Plain | __ | 000000 | 00 | 30 | 0000000 | 000000 |
| 4 | 4" | __ | Damper | Plain | 30 | 00000000 | 000000 | 30 | 0000000 | 00000 |
| 5 | 5" | __ | Damper | Plain | 30 | 00000000 | 00000 | __ | 000000 | 00 |
| 6 | 6" | __ | Damper | Plain | 30 | 00000000 | 00000 | 22 | 0000000 | 00000 |
| 7 | 7" | __ | Damper | Plain | 30 | 00000000 | 00000 | __ | 000000 | 00 |
| 8 | 8" | __ | Damper | Plain | 30 | 00000000 | 00000 | 22 | 0000000 | 000000 |
Intake Vent | ||||||||||
| 4 | __ | 3 7/8" | Screen | Crimped | 30 | 00000000 | 00000 | __ | 000000 | 00 |
| 5 | __ | 4 7/8" | Screen | Crimped | 30 | 00000000 | 00000 | __ | 000000 | 00 |
| 6 | __ | 5 7/8" | Screen | Crimped | 30 | 00000000 | 00000 | __ | 000000 | 00 |
| 7 | __ | 6 7/8" | Screen | Crimped | 30 | 00000000 | 00000 | __ | 000000 | 00 |
| 8 | __ | 7 7/8" | Screen | Crimped | 30 | 00000000 | 00000 | __ | 000000 | 00 |
Galvanized Steel | 304 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|---|
| Duct Size | Female ID | End Construction | Gauge | Each | Gauge | Each | ||
| 3 | 3" | Plain | 26 | 0000000 | 000000 | __ | 000000 | 00 |
| 4 | 4" | Plain | 26 | 0000000 | 00000 | 26 | 0000000 | 000000 |
| 5 | 5" | Plain | 26 | 0000000 | 00000 | __ | 000000 | 00 |
| 6 | 6" | Plain | 26 | 0000000 | 00000 | 26 | 0000000 | 00000 |
| 7 | 7" | Plain | 26 | 0000000 | 00000 | __ | 000000 | 00 |
| 8 | 8" | Plain | 26 | 0000000 | 00000 | 26 | 0000000 | 00000 |
| 9 | 9" | Plain | 26 | 0000000 | 00000 | __ | 000000 | 00 |
| 10 | 10" | Plain | 26 | 0000000 | 00000 | 26 | 0000000 | 000000 |
| 12 | 12" | Plain | 26 | 0000000 | 00000 | 26 | 0000000 | 000000 |
Galvanized Steel | 304 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|---|
| Duct Size | Female ID | Male OD | Gauge | End Construction | Each | Each | ||
Female | ||||||||
| 3 | 3" | __ | 26 | Plain | 00000000 | 00000 | 0000000 | 000000 |
| 4 | 4" | __ | 26 | Plain | 00000000 | 0000 | 0000000 | 00000 |
| 5 | 5" | __ | 26 | Plain | 00000000 | 0000 | 000000 | 00 |
| 6 | 6" | __ | 26 | Plain | 00000000 | 0000 | 0000000 | 00000 |
| 7 | 7" | __ | 26 | Plain | 00000000 | 00000 | 000000 | 00 |
| 8 | 8" | __ | 26 | Plain | 00000000 | 00000 | 0000000 | 00000 |
| 9 | 9" | __ | 26 | Plain | 00000000 | 00000 | 000000 | 00 |
| 10 | 10" | __ | 26 | Plain | 00000000 | 00000 | 0000000 | 000000 |
| 12 | 12" | __ | 26 | Plain | 00000000 | 00000 | 000000 | 00 |
| 14 | 14" | __ | 26 | Plain | 00000000 | 00000 | 000000 | 00 |
| 16 | 16" | __ | 26 | Plain | 00000000 | 00000 | 000000 | 00 |
| 18 | 18" | __ | 26 | Plain | 00000000 | 00000 | 000000 | 00 |
| 20 | 20" | __ | 24 | Plain | 00000000 | 00000 | 000000 | 00 |
| 22 | 22" | __ | 24 | Plain | 00000000 | 00000 | 000000 | 00 |
| 24 | 24" | __ | 24 | Plain | 00000000 | 00000 | 000000 | 00 |
Male | ||||||||
| 3 | __ | 2 7/8" | 26 | Crimped | 00000000 | 0000 | 000000 | 00 |
| 4 | __ | 3 7/8" | 26 | Crimped | 00000000 | 0000 | 000000 | 00 |
| 5 | __ | 4 7/8" | 26 | Crimped | 00000000 | 0000 | 000000 | 00 |
| 6 | __ | 5 7/8" | 26 | Crimped | 00000000 | 0000 | 000000 | 00 |
| 7 | __ | 6 7/8" | 26 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 8 | __ | 7 7/8" | 26 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 9 | __ | 8 15/16" | 26 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 10 | __ | 9 7/8" | 26 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 12 | __ | 11 7/8" | 26 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 14 | __ | 13 7/8" | 26 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 16 | __ | 15 7/8" | 26 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 18 | __ | 17 7/8" | 24 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 20 | __ | 19 7/8" | 24 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 22 | __ | 21 7/8" | 24 | Crimped | 00000000 | 00000 | 000000 | 00 |
| 24 | __ | 23 7/8" | 24 | Crimped | 00000000 | 00000 | 000000 | 00 |
Chemical-Resistant Duct and Fittings
Made of PVC plastic to withstand acids, alkalies, salts, and other corrosive vapors and fumes. Use PVC pipe cement (not included) to secure components. Fittings have female ends with a slightly larger diameter to press-fit over duct.
For technical drawings and 3-D models, click on a part number.
Quick-Disconnect Duct and Fittings
Join duct and fittings with quick-release clamps for faster disassembly and cleanout than other duct systems.
Galvanized steel has good corrosion resistance. 304 stainless steel is the most corrosion resistant.
For technical drawings and 3-D models, click on a part number.
Galvanized Steel | 304 Stainless Steel | ||||||
|---|---|---|---|---|---|---|---|
| Duct Size | ID | Gauge | End Construction | Each | Each | ||
| 3 | 2 7/8" | 18 | Rolled | 00000000 | 000000 | 000000 | 00 |
| 3 | 3 1/16" | 22 | Rolled | 000000 | 00 | 00000000 | 000000 |
| 4 | 3 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 5 | 4 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 6 | 5 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 7 | 6 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 8 | 7 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 9 | 8 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 10 | 9 7/8" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 12 | 12" | 22 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 14 | 13 15/16" | 20 | Rolled | 00000000 | 00000 | 00000000 | 00000 |
| 16 | 16" | 20 | Rolled | 00000000 | 00000 | 00000000 | 000000 |
| 18 | 17 7/8" | 20 | Rolled | 00000000 | 00000 | 000000 | 00 |
| 18 | 17 15/16" | 20 | Rolled | 000000 | 00 | 00000000 | 000000 |
| 20 | 19 7/8" | 20 | Rolled | 00000000 | 00000 | 000000 | 00 |
| 20 | 19 15/16" | 20 | Rolled | 000000 | 00 | 00000000 | 000000 |
| 22 | 21 7/8" | 20 | Rolled | 00000000 | 00000 | 000000 | 00 |
| 24 | 23 7/8" | 20 | Rolled | 00000000 | 00000 | 000000 | 00 |
Sure-Seal Spiral Duct and Fittings
Fittings have gaskets which create a tight seal—you don't need to seal joints with coating or tape. Fittings have male ends with a slightly smaller diameter to press-fit into duct. These duct and fittings are compatible with Crush-Resistant Spiral Duct and Fittings.
For technical drawings and 3-D models, click on a part number.
Crush-Resistant Spiral Duct and Fittings
A spiral seam makes this duct strong and rigid. Fittings have male ends with a slightly smaller diameter to press-fit into duct.
Galvanized steel has good corrosion resistance. 304 stainless steel is more corrosion resistant than steel.
For technical drawings and 3-D models, click on a part number.
Galvanized Steel | 304 Stainless Steel | ||||||
|---|---|---|---|---|---|---|---|
| Duct Size | Male OD | Gauge | End Construction | Each | Each | ||
Male | |||||||
| 3 | 2 7/8" | 24 | Spiral | 0000000 | 000000 | 00000000 | 000000 |
| 4 | 3 7/8" | 24 | Plain | 000000 | 00 | 0000000 | 00000 |
| 4 | 3 7/8" | 24 | Spiral | 0000000 | 00000 | 000000 | 00 |
| 5 | 4 7/8" | 24 | Spiral | 0000000 | 00000 | 00000000 | 00000 |
| 6 | 5 7/8" | 24 | Plain | 000000 | 00 | 0000000 | 00000 |
| 6 | 5 7/8" | 24 | Spiral | 0000000 | 00000 | 000000 | 00 |
| 7 | 6 7/8" | 24 | Spiral | 00000000 | 00000 | 00000000 | 00000 |
| 8 | 7 7/8" | 24 | Plain | 000000 | 00 | 0000000 | 00000 |
| 8 | 7 7/8" | 24 | Spiral | 0000000 | 00000 | 000000 | 00 |
| 9 | 8 7/8" | 24 | Spiral | 00000000 | 00000 | 00000000 | 00000 |
| 10 | 9 7/8" | 24 | Plain | 000000 | 00 | 0000000 | 00000 |
| 10 | 9 7/8" | 24 | Spiral | 0000000 | 00000 | 000000 | 00 |
| 12 | 11 7/8" | 24 | Spiral | 0000000 | 00000 | 00000000 | 00000 |
| 14 | 13 7/8" | 24 | Spiral | 0000000 | 00000 | 00000000 | 000000 |
| 16 | 15 7/8" | 24 | Spiral | 0000000 | 00000 | 00000000 | 000000 |
| 18 | 17 7/8" | 22 | Spiral | 00000000 | 00000 | 000000 | 00 |
| 18 | 17 7/8" | 24 | Spiral | 000000 | 00 | 00000000 | 000000 |
| 20 | 19 7/8" | 24 | Spiral | 00000000 | 00000 | 00000000 | 000000 |
| 22 | 21 7/8" | 24 | Spiral | 00000000 | 00000 | 000000 | 00 |
| 24 | 23 7/8" | 24 | Spiral | 00000000 | 00000 | 000000 | 00 |
Rectangular Duct and Fittings
Often used in tight spaces, such as in walls and ceilings, rectangular duct allows you to select larger sizes without increasing duct height. Duct and fittings have interconnecting ends that lock together with brackets.
For technical drawings and 3-D models, click on a part number.
Wall Vent Caps
Cover external vents to reduce downdrafts and prevent obstructions from entering the vent.
For Duct | Mounting | Painted Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Ht. | Wd. | Ht. | Wd. | Lg. | Gauge | Features | Includes | Fasteners Included | Hole Dia. | Each | |
For Rectangular Duct | |||||||||||
| 10" | 3 1/4" | 5 5/8" | 12 3/4" | 8 7/8" | 24 | Bird Screen | Backdraft Damper | No | 3/16" | 0000000 | 000000 |
Sloped Roof Vent Caps
Cover external vents to reduce downdrafts and prevent obstructions from entering the vent.
For Duct | Painted Steel | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Ht. | Wd. | Dia. | Ht. | Wd. | Lg. | Gauge | Features | Includes | Each | |
For Rectangular and Round Duct | ||||||||||
| 10" | 3 1/4" | 8" | 6 5/8" | 14 1/4" | 18 3/4" | 24 | Bird Screen | Backdraft Damper | 0000000 | 000000 |
45° Flared Fittings for Copper and Brass Tubing
- Temperature Range: -65° to 250° F
- Tubing: Use with seamless brass and copper that meets ASTM B280
No sleeve is required to assemble these fittings, which makes for a faster, more convenient installation compared to 37° flared fittings. They require a nut (sold separately) for each tube end. Fittings are also known as refrigeration and SAE fittings. They are brass for good corrosion resistance.
Copper tube size is the accepted designation of the copper tubing industry, not the actual tube OD.
For technical drawings and 3-D models, click on a part number.
- For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water;
except caps for 1/8" tube OD are only for use with refrigerant - Specifications Met: See table
For Tube | ||||||
|---|---|---|---|---|---|---|
| OD | Wall Thick. | Material | Max. Pressure | Specifications Met | Each | |
| 1/8" | 0.03" | Brass | 2,800 psi @ 73° F | __ | 000000000 | 00000 |
| 3/16" | 0.03" | Brass | 1,900 psi @ 72° F | SAE J512, SAE J513, UL Listed | 000000000 | 0000 |
| 1/4" | 0.03" | Brass | 1,400 psi @ 72° F | SAE J512, SAE J513, UL Listed | 000000000 | 0000 |
| 5/16" | 0.032" | Brass | 1,200 psi @ 72° F | SAE J512, SAE J513, UL Listed | 000000000 | 0000 |
| 3/8" | 0.032" | Brass | 1,000 psi @ 72° F | SAE J512, SAE J513, UL Listed | 000000000 | 0000 |
| 1/2" | 0.032" | Brass | 750 psi @ 72° F | SAE J512, SAE J513, UL Listed | 000000000 | 0000 |
| 5/8" | 0.035" | Brass | 650 psi @ 72° F | SAE J512, SAE J513, UL Listed | 000000000 | 0000 |
| 3/4" | 0.035" | Brass | 550 psi @ 72° F | SAE J512, SAE J513, UL Listed | 000000000 | 00000 |
- For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water
- Specifications Met: SAE J512, SAE J513, UL Listed
- For Use With: Air, Cutting Oil, Diesel Fuel, Fuel Oil, Mineral Oil, Refrigerant, Water; except nuts for 1" tube OD are not for use with fuel oil
- Specifications Met: SAE J512, SAE J513, UL Listed; except nuts for 1" tube OD meet SAE J512 and SAE J513 only
For Tube | |||||||
|---|---|---|---|---|---|---|---|
| OD | Wall Thick. | Nut Material | Max. Pressure | Lg. | Each | ||
Short Nuts  | |||||||
| A | 1/8" | 0.03" | Brass | 2,800 psi @ 72° F | 1/2" | 000000000 | 00000 |
| A | 3/16" | 0.035" | Brass | 1,900 psi @ 72° F | 5/8" | 000000000 | 0000 |
| A | 1/4" | 0.049" | Brass | 1,400 psi @ 72° F | 3/4" | 000000000 | 0000 |
| A | 5/16" | 0.049" | Brass | 1,200 psi @ 72° F | 7/8" | 000000000 | 0000 |
| A | 3/8" | 0.032" | Brass | 1,000 psi @ 72° F | 29/32" | 000000000 | 0000 |
| A | 3/8" | 0.065" | Brass | 1,000 psi @ 72° F | 1" | 000000000 | 0000 |
| A | 1/2" | 0.032" | Brass | 750 psi @ 72° F | 1" | 000000000 | 0000 |
| A | 1/2" | 0.083" | Brass | 750 psi @ 72° F | 1 1/8" | 000000000 | 0000 |
| A | 5/8" | 0.035" | Brass | 650 psi @ 72° F | 1 1/16" | 000000000 | 00000 |
| A | 5/8" | 0.095" | Brass | 650 psi @ 72° F | 1 5/16" | 000000000 | 00000 |
| A | 3/4" | 0.035" | Brass | 550 psi @ 72° F | 1 5/32" | 000000000 | 00000 |
| A | 3/4" | 0.109" | Brass | 550 psi @ 72° F | 1 1/2" | 000000000 | 00000 |
| B | 1/4" | 0.03" | Brass | 1,400 psi @ 72° F | 5/8" | 00000000 | 0000 |
| B | 1/2" | 0.032" | Brass | 750 psi @ 72° F | 27/32" | 000000000 | 0000 |
| B | 5/8" | 0.035" | Brass | 650 psi @ 72° F | 31/32" | 000000000 | 00000 |
Long Nuts | |||||||
| A | 1/8" | 0.03" | Brass | 2,800 psi @ 72° F | 3/4" | 000000000 | 0000 |
| A | 3/16" | 0.035" | Brass | 1,900 psi @ 72° F | 13/16" | 000000000 | 0000 |
| A | 1/4" | 0.049" | Brass | 1,400 psi @ 72° F | 15/16" | 000000000 | 0000 |
| A | 5/16" | 0.049" | Brass | 1,200 psi @ 72° F | 1 1/8" | 000000000 | 0000 |
| A | 3/8" | 0.065" | Brass | 1,000 psi @ 72° F | 1 5/16" | 000000000 | 0000 |
| A | 1/2" | 0.083" | Brass | 750 psi @ 72° F | 1 5/8" | 000000000 | 00000 |
| A | 5/8" | 0.095" | Brass | 650 psi @ 72° F | 1 7/8" | 000000000 | 00000 |
| A | 3/4" | 0.109" | Brass | 550 psi @ 72° F | 2 3/16" | 000000000 | 00000 |