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DFARS Specialty Metals
About Duct Connections
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Duct Flanges
Bolt flanges to equipment to start a run of duct. They can also create secure connections between two duct ends by mounting a flange to each end and then joining the flanges.
Steel, galvanized steel, 304 stainless steel, and aluminum flanges are also known as angle rings.
Galvanized steel flanges have good corrosion resistance. Aluminum flanges have good corrosion resistance in wet environments, and weigh less than steel and stainless steel flanges. 304 stainless steel flanges are more corrosion resistant than steel. PVC plastic flanges are chemical resistant and withstand harsh environments. They’re compatible with Chemical-Resistant Duct and Fittings.
For technical drawings and 3-D models, click on a part number.
Steel, Galvanized Steel, 304 Stainless Steel, and Aluminum
Steel, Galvanized
Steel, 304 Stainless
Steel, and Aluminum
Steel, 304 Stainless
Steel, and Aluminum
Flange | Mounting | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Duct Size | Female ID | Overall Dp. | Ht. | Thick. | Fasteners Included | No. of Holes | Hole Dia. | Connection Type | Each | |
Steel | ||||||||||
| 3 | 3 1/16" | 1" | 1" | 1/8" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 3 1/2 | 3 9/16" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 4 | 4 1/16" | 1" | 1" | 1/8" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 4 1/2 | 4 9/16" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 5 | 5 1/16" | 1" | 1" | 1/8" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 5 1/2 | 5 9/16" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 6 | 6 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 7 | 7 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 8 | 8 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 9 | 9 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 10 | 10 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 11 | 11 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 12 | 12 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 13 | 13 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 14 | 14 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 15 | 15 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 16 | 16 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 17 | 17 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 18 | 18 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 19 | 19 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 00000000 | 00000 |
| 20 | 20 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 00000 |
| 21 | 21 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 00000 |
| 22 | 22 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 00000 |
| 23 | 23 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 00000 |
| 24 | 24 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 00000 |
| 25 | 25 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 00000 |
| 26 | 26 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 00000 |
| 27 | 27 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 00000 |
| 28 | 28 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 00000 |
| 29 | 29 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 00000 |
| 30 | 30 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 00000 |
| 32 | 32 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 00000 |
| 34 | 34 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 00000 |
| 36 | 36 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 00000000 | 00000 |
| 38 | 38 1/8" | 2" | 2" | 3/16" | No | 24 | 7/16" | Press Fit | 00000000 | 00000 |
| 40 | 40 1/8" | 2" | 2" | 3/16" | No | 24 | 7/16" | Press Fit | 00000000 | 000000 |
| 42 | 42 1/8" | 2" | 2" | 3/16" | No | 24 | 7/16" | Press Fit | 00000000 | 000000 |
| 44 | 44 1/8" | 2" | 2" | 3/16" | No | 24 | 7/16" | Press Fit | 00000000 | 000000 |
| 46 | 46 1/8" | 2" | 2" | 3/16" | No | 24 | 7/16" | Press Fit | 00000000 | 000000 |
| 48 | 48 1/8" | 2" | 2" | 3/16" | No | 24 | 7/16" | Press Fit | 00000000 | 000000 |
| 52 | 52 1/8" | 2" | 2" | 3/16" | No | 24 | 7/16" | Press Fit | 00000000 | 000000 |
Galvanized Steel | ||||||||||
| 3 | 3 1/16" | 1" | 1" | 1/8" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 3 1/2 | 3 17/32" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 00000000 | 00000 |
| 4 | 4 1/16" | 1" | 1" | 1/8" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 4 1/2 | 4 17/32" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 00000000 | 00000 |
| 5 | 5 1/16" | 1" | 1" | 1/8" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 5 1/2 | 5 17/32" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 00000000 | 00000 |
| 6 | 6 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 7 | 7 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 8 | 8 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 9 | 9 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 10 | 10 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 11 | 11 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 12 | 12 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 13 | 13 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 14 | 14 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 15 | 15 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 16 | 16 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 17 | 17 3/16" | 1 1/2" | 1 1/2" | 3/16" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 18 | 18 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 20 | 20 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 00000 |
| 21 | 21 3/16" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 00000 |
| 22 | 22 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 00000 |
| 23 | 23 3/16" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 00000 |
| 24 | 24 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 00000 |
| 26 | 26 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 000000 |
| 28 | 28 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 000000 |
| 30 | 30 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 000000 |
| 34 | 34 3/16" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 000000 |
| 36 | 36 3/16" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 000000 |
| 38 | 38 3/16" | 2" | 2" | 3/16" | No | 24 | 7/16" | Press Fit | 0000000 | 000000 |
| 40 | 40 3/16" | 2" | 2" | 3/16" | No | 24 | 7/16" | Press Fit | 0000000 | 000000 |
304 Stainless Steel | ||||||||||
| 3 | 3 1/16" | 7/8" | 1" | 1/8" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 3 1/2 | 3 9/16" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 00000000 | 00000 |
| 4 | 4 1/16" | 1" | 1" | 1/8" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 4 1/2 | 4 9/16" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 00000000 | 00000 |
| 5 | 5 1/16" | 1" | 1" | 1/8" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 5 1/2 | 5 9/16" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 00000000 | 00000 |
| 6 | 6 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 7 | 7 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 8 | 8 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 9 | 9 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 10 | 10 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 11 | 11 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 12 | 12 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 13 | 13 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 14 | 14 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 15 | 15 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 16 | 16 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 8 | 7/16" | Press Fit | 0000000 | 000000 |
| 18 | 18 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 8 | 7/16" | Press Fit | 0000000 | 000000 |
| 19 | 19 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 00000000 | 000000 |
| 20 | 20 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 000000 |
| 22 | 22 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 000000 |
| 24 | 24 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 000000 |
| 26 | 26 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 000000 |
| 28 | 28 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 000000 |
| 30 | 30 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 000000 |
| 32 | 32 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 00000000 | 000000 |
| 36 | 36 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 00000000 | 000000 |
| 38 | 38 1/8" | 2" | 2" | 3/16" | No | 24 | 7/16" | Press Fit | 00000000 | 000000 |
| 40 | 40 1/8" | 2" | 2" | 3/16" | No | 24 | 7/16" | Press Fit | 00000000 | 000000 |
Alumiunum | ||||||||||
| 3 | 3 1/16" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 3 1/2 | 3 9/16" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 4 | 4 1/16" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 4 1/2 | 4 9/16" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 5 | 5 1/16" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 5 1/2 | 5 9/16" | 1" | 1" | 9/64" | No | 6 | 9/32" | Press Fit | 0000000 | 00000 |
| 6 | 6 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 7 | 7 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 8 | 8 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 9 | 9 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 10 | 10 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 11 | 11 1/8" | 1 1/4" | 1 1/4" | 1/8" | No | 6 | 3/8" | Press Fit | 0000000 | 00000 |
| 12 | 12 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 13 | 13 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 14 | 14 1/8" | 1 1/2" | 1 1/2" | 1/8" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 16 | 16 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 18 | 18 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 8 | 7/16" | Press Fit | 0000000 | 00000 |
| 20 | 20 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 00000 |
| 24 | 24 1/8" | 1 1/2" | 1 1/2" | 3/16" | No | 12 | 7/16" | Press Fit | 0000000 | 000000 |
| 26 | 26 1/8" | 2" | 2" | 3/16" | No | 16 | 7/16" | Press Fit | 0000000 | 000000 |
PVC Plastic
PVC Plastic
Flange | Mounting | PVC Plastic | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Duct Size | Female ID | Overall Dp. | Ht. | Thick. | Fasteners Included | No. of Holes | Hole Dia. | Connection Type | Each | |
| 4 | 4 1/2" | 2 1/4" | 1 7/8" | 1/4" | No | 4 | 5/16" | Press Fit | 000000 | 000000 |
| 6 | 6 5/8" | 3 1/4" | 1 1/2" | 1/4" | No | 8 | 5/16" | Press Fit | 0000000 | 00000 |
| 8 | 8 5/8" | 3 1/4" | 1 1/2" | 1/4" | No | 10 | 5/16" | Press Fit | 0000000 | 00000 |
| 10 | 10 3/4" | 3 1/4" | 1 3/8" | 1/4" | No | 12 | 5/16" | Press Fit | 0000000 | 000000 |
| 12 | 12 3/4" | 3 1/2" | 1 3/8" | 1/4" | No | 16 | 5/16" | Press Fit | 0000000 | 000000 |
| 14 | 14" | 3 1/2" | 1 3/4" | 1/4" | No | 16 | 5/16" | Press Fit | 0000000 | 000000 |
| 16 | 16" | 3 1/2" | 1 3/4" | 1/4" | No | 18 | 5/16" | Press Fit | 0000000 | 000000 |
Weld-On Duct Flanges
Weld flanges to equipment to start a run of duct. They can also create secure connections between two duct ends by mounting a flange to each end and then joining the flanges. Also known as angle rings.
304 stainless steel flanges are more corrosion resistant than steel.
For technical drawings and 3-D models, click on a part number.
Flange | Steel | 304 Stainless Steel | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Duct Size | Female ID | Overall Dp. | Ht. | Thick. | Connection Type | Each | Each | ||
| 3 | 3 1/16" | 1" | 1" | 1/8" | Press Fit | 0000000 | 00000 | 000000 | 00 |
| 4 | 4 1/16" | 1" | 1" | 1/8" | Press Fit | 0000000 | 00000 | 0000000 | 000000 |
| 5 | 5 1/16" | 1" | 1" | 1/8" | Press Fit | 0000000 | 00000 | 0000000 | 00000 |
| 6 | 6 1/8" | 1 1/4" | 1 1/4" | 1/8" | Press Fit | 0000000 | 00000 | 0000000 | 00000 |
| 7 | 7 1/8" | 1 1/4" | 1 1/4" | 1/8" | Press Fit | 0000000 | 00000 | 0000000 | 00000 |
| 8 | 8 1/8" | 1 1/4" | 1 1/4" | 1/8" | Press Fit | 0000000 | 00000 | 0000000 | 00000 |
| 9 | 9 1/8" | 1 1/4" | 1 1/4" | 1/8" | Press Fit | 0000000 | 00000 | 0000000 | 00000 |
| 10 | 10 1/8" | 1 1/4" | 1 1/4" | 1/8" | Press Fit | 0000000 | 00000 | 0000000 | 00000 |
| 11 | 11 1/8" | 1 1/4" | 1 1/4" | 1/8" | Press Fit | 0000000 | 00000 | 0000000 | 00000 |
| 12 | 12 1/8" | 1 1/2" | 1 1/2" | 1/8" | Press Fit | 0000000 | 00000 | 0000000 | 00000 |
| 13 | 13 1/8" | 1 1/2" | 1 1/2" | 1/8" | Press Fit | 0000000 | 00000 | 0000000 | 00000 |
| 14 | 14 1/8" | 1 1/2" | 1 1/2" | 1/8" | Press Fit | 0000000 | 00000 | 0000000 | 00000 |
| 15 | 15 1/8" | 1 1/2" | 1 1/2" | 1/8" | Press Fit | 0000000 | 00000 | 0000000 | 00000 |
| 16 | 16 1/8" | 1 1/2" | 1 1/2" | 3/16" | Press Fit | 0000000 | 00000 | 0000000 | 000000 |
| 18 | 18 1/8" | 1 1/2" | 1 1/2" | 3/16" | Press Fit | 0000000 | 00000 | 0000000 | 000000 |
| 20 | 20 1/8" | 1 1/2" | 1 1/2" | 3/16" | Press Fit | 0000000 | 00000 | 0000000 | 000000 |
| 22 | 22 1/8" | 1 1/2" | 1 1/2" | 3/16" | Press Fit | 0000000 | 00000 | 0000000 | 000000 |
| 24 | 24 1/8" | 1 1/2" | 1 1/2" | 3/16" | Press Fit | 0000000 | 00000 | 0000000 | 000000 |
| 26 | 26 1/8" | 2" | 2" | 3/16" | Press Fit | 0000000 | 00000 | 0000000 | 000000 |
| 28 | 28 1/8" | 2" | 2" | 3/16" | Press Fit | 0000000 | 00000 | 0000000 | 000000 |
| 30 | 30 1/8" | 2" | 2" | 3/16" | Press Fit | 0000000 | 00000 | 0000000 | 000000 |