AWWA C207 Class E Flange Dimensions
This chart gives AWWA C207 Class E steel pipe flange dimensions in inches — outside diameter, bolt circle, number and size of bolt holes, bolt size and flange thickness for ring (slip-on) and hub flanges. AWWA C207 covers steel flanges for waterworks service from 4 in to 144 in; Class E is rated 275 psi.
Teshi Group manufactures AWWA C207 ring and hub flanges in India for water transmission, treatment and pumping projects.
Key to dimensions
- D
- Outside diameter of flange
- C
- Flange thickness, excluding raised face unless stated
- N
- Neck / hub diameter at base
- H
- Length through hub / neck length
- K
- Bolt circle (pitch circle) diameter
- n
- Number of bolts
- L
- Bolt hole diameter
- Bolt
- Bolt size (metric M or inch diameter)
AWWA C207 Class E Flange Dimensions — tables
Class E — steel ring (slip-on) flange, 275 psi — inches
| Size | DFlange OD | KBolt circle | nBolts | LHole dia | BoltSize | CSlip-on ring |
|---|---|---|---|---|---|---|
| 4 | 9 | 7.5 | 8 | 0.75 | — | 1.125 |
| 5 | 10 | 8.5 | 8 | 0.875 | — | 1.188 |
| 6 | 11 | 9.5 | 8 | 0.875 | — | 1.313 |
| 8 | 13.5 | 11.75 | 8 | 0.875 | — | 1.5 |
| 10 | 16 | 14.25 | 12 | 1 | — | 1.563 |
| 12 | 19 | 17 | 12 | 1 | — | 1.75 |
| 14 | 21 | 18.75 | 12 | 1.125 | — | 1.875 |
| 16 | 23.5 | 21.25 | 16 | 1.125 | — | 2 |
| 18 | 25 | 22.75 | 16 | 1.25 | — | 2.125 |
| 20 | 27.5 | 25 | 20 | 1.25 | — | 2.375 |
| 22 | 29.5 | 27.25 | 20 | 1.375 | — | 2.5 |
| 24 | 32 | 29.5 | 20 | 1.375 | — | 2.625 |
| 26 | 34.25 | 31.75 | 24 | 1.375 | — | 2.75 |
| 28 | 36.5 | 34 | 28 | 1.375 | — | 2.75 |
| 30 | 38.75 | 36 | 28 | 1.375 | — | 2.875 |
| 32 | 41.75 | 38.5 | 28 | 1.625 | — | 3 |
| 34 | 43.75 | 40.5 | 32 | 1.625 | — | 3 |
| 36 | 46 | 42.75 | 32 | 1.625 | — | 3.125 |
| 38 | 48.75 | 45.25 | 32 | 1.625 | — | 3.125 |
| 40 | 50.75 | 47.25 | 36 | 1.625 | — | 3.25 |
| 42 | 53 | 49.5 | 36 | 1.625 | — | 3.375 |
| 44 | 55.25 | 51.75 | 40 | 1.625 | — | 3.375 |
| 46 | 57.25 | 53.75 | 40 | 1.625 | — | 3.438 |
| 48 | 59.5 | 56 | 44 | 1.625 | — | 3.5 |
| 50 | 61.75 | 58.25 | 44 | 1.875 | — | 3.5 |
| 52 | 64 | 60.5 | 44 | 1.875 | — | 3.625 |
| 54 | 66.25 | 62.75 | 44 | 1.875 | — | 3.75 |
| 60 | 73 | 69.25 | 52 | 1.875 | — | 3.875 |
| 66 | 80 | 76 | 52 | 1.875 | — | 4.25 |
| 72 | 86.5 | 82.5 | 60 | 1.875 | — | 4.375 |
| 78 | 93 | 89 | 64 | 2.125 | — | 4.75 |
| 84 | 99.75 | 95.5 | 64 | 2.125 | — | 4.75 |
| 90 | 106.5 | 102 | 68 | 2.438 | — | 5.125 |
| 96 | 113.25 | 108.5 | 68 | 2.438 | — | 5.125 |
| 102 | 120 | 114.5 | 72 | 2.688 | — | 5.5 |
| 108 | 126.75 | 120.75 | 72 | 2.688 | — | 5.5 |
| 114 | 133.5 | 126.75 | 76 | 2.938 | — | 5.875 |
| 120 | 140.25 | 132.75 | 76 | 2.938 | — | 5.875 |
| 126 | 147 | 139.25 | 80 | 3.188 | — | 6.25 |
| 132 | 153.75 | 145.75 | 80 | 3.188 | — | 6.25 |
| 138 | 160.5 | 152 | 84 | 3.438 | — | 6.75 |
| 144 | 167.25 | 158.25 | 84 | 3.438 | — | 6.75 |
Class E — steel hub flange, 275 psi — inches
| Size | DFlange OD | KBolt circle | nBolts | LHole dia | BoltSize | CHub flange | HOverall length incl. hub | NHub / neck dia |
|---|---|---|---|---|---|---|---|---|
| 4 | 9 | 7.5 | 8 | 0.75 | — | 0.938 | 1.312 | 5.312 |
| 5 | 10 | 8.5 | 8 | 0.875 | — | 0.938 | 1.438 | 6.438 |
| 6 | 11 | 9.5 | 8 | 0.875 | — | 1 | 1.562 | 7.562 |
| 8 | 13.5 | 11.75 | 8 | 0.875 | — | 1.125 | 1.75 | 9.688 |
| 10 | 16 | 14.25 | 12 | 1 | — | 1.188 | 1.938 | 12 |
| 12 | 19 | 17 | 12 | 1 | — | 1.25 | 2.188 | 14.375 |
| 14 | 21 | 18.75 | 12 | 1.125 | — | 1.375 | 2.25 | 15.75 |
| 16 | 23.5 | 21.25 | 16 | 1.125 | — | 1.438 | 2.5 | 18 |
| 18 | 25 | 22.75 | 16 | 1.25 | — | 1.562 | 2.688 | 19.875 |
| 20 | 27.5 | 25 | 20 | 1.25 | — | 1.688 | 2.875 | 22 |
| 22 | 29.5 | 27.25 | 20 | 1.375 | — | 1.812 | 3.125 | 24 |
| 24 | 32 | 29.5 | 20 | 1.375 | — | 1.875 | 3.25 | 26.125 |
| 26 | 34.25 | 31.75 | 24 | 1.375 | — | 2 | 3.375 | 28.5 |
| 28 | 36.5 | 34 | 28 | 1.375 | — | 2.062 | 3.438 | 30.75 |
| 30 | 38.75 | 36 | 28 | 1.375 | — | 2.125 | 3.5 | 32.75 |
| 32 | 41.75 | 38.5 | 28 | 1.625 | — | 2.25 | 3.625 | 35 |
| 34 | 43.75 | 40.5 | 32 | 1.625 | — | 2.312 | 3.688 | 37 |
| 36 | 46 | 42.75 | 32 | 1.625 | — | 2.375 | 3.75 | 39.25 |
| 38 | 48.75 | 45.25 | 32 | 1.625 | — | 2.375 | 3.75 | 41.75 |
| 40 | 50.75 | 47.25 | 36 | 1.625 | — | 2.5 | 3.875 | 43.75 |
| 42 | 53 | 49.5 | 36 | 1.625 | — | 2.625 | 4 | 46 |
| 44 | 55.25 | 51.75 | 40 | 1.625 | — | 2.625 | 4 | 48 |
| 46 | 57.25 | 53.75 | 40 | 1.625 | — | 2.688 | 4.062 | 50 |
| 48 | 59.5 | 56 | 44 | 1.625 | — | 2.75 | 4.125 | 52.25 |
| 50 | 61.75 | 58.25 | 44 | 1.875 | — | 2.75 | 4.125 | 54.25 |
| 52 | 64 | 60.5 | 44 | 1.875 | — | 2.875 | 4.25 | 56.5 |
| 54 | 66.25 | 62.75 | 44 | 1.875 | — | 3 | 4.375 | 58.75 |
| 60 | 73 | 69.25 | 52 | 1.875 | — | 3.125 | 4.5 | 65.25 |
| 66 | 80 | 76 | 52 | 1.875 | — | 3.375 | 4.875 | 71.5 |
| 72 | 86.5 | 82.5 | 60 | 1.875 | — | 3.5 | 5 | 78.5 |
| 78 | 93 | 89 | 64 | 2.125 | — | 3.875 | 5.375 | 84.5 |
| 84 | 99.75 | 95.5 | 64 | 2.125 | — | 3.875 | 5.375 | 90.5 |
| 90 | 106.5 | 102 | 68 | 2.438 | — | 4.25 | 5.75 | 96.75 |
| 96 | 113.25 | 108.5 | 68 | 2.438 | — | 4.25 | 5.75 | 102.75 |
Notes
- All dimensions are in inches (1 in = 25.4 mm).
- AWWA C207 drilling matches ASME B16.1 / B16.5 Class 125/150 drilling in the sizes they share, so AWWA flanges bolt to Class 150 valves and fittings.
- Pressure ratings are for water service at ambient temperature; refer to the standard for test pressures.
- Values are nominal, compiled from published copies of the standard; blank cells (—) are values not confirmed from the sources available. Verify against the current edition before design, purchase or fabrication.
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
Dimension finder
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AWWA C207 Class E Flange Dimensions — size by size
Every size has its own page with a drawing, mm and inch values and a one-size PDF.
Equivalent and related standards to AWWA C207 Class E Flange Dimensions
All equivalents| Region | Standard | Relationship |
|---|---|---|
| USA | AWWA C228 | Stainless steel waterworks flanges with C207 drilling |
| USA | ASME B16.5 Class 150 / B16.47 | Class 150 drilling matches C207 Class D/E up to NPS 24 — check thickness |
| Australia | AS 4087 | Waterworks flanges |
Teshi Group manufactures flanges and fittings to all of these standards on request, including Chinese GB / HG / SH and European EN dimensions for export projects. Always confirm bolting, facing and thickness when substituting one standard for another.
FAQ
AWWA C207 Class E Flange dimensions: common questions
What are the dimensions of a 24 inch AWWA C207 Class E flange?
A 24 in AWWA C207 Class E ring flange has an outside diameter of 32 in, a bolt circle of 29.5 in, 20 holes of 1.375 in and a thickness of 2.625 in.
Do AWWA C207 flanges mate with ASME Class 150 flanges?
In the sizes both standards cover the bolt circle and drilling match ASME Class 125/150, so they bolt together; thickness and pressure ratings differ.
Does Teshi Group manufacture AWWA C207 flanges?
Teshi Group manufactures steel flanges in India to AWWA C207 drilling — weld neck, slip-on, plate and blind — in carbon, alloy, stainless, duplex and nickel-alloy grades, with EN 10204 3.1 certificates.
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