Ring Gaskets - AWWA C207 & C228 Class B, D & E
The table below provides the gasket dimensions for American Water Works Association flanges of type C207 (steel flanges) and C228 (stainless steel flanges).
| NPS | ID | OD |
|---|---|---|
| 4 | 4.5 | 6.88 |
| 5 | 5.56 | 7.75 |
| 6 | 6.62 | 8.75 |
| 8 | 8.62 | 11 |
| 10 | 10.75 | 13.38 |
| 12 | 12.75 | 16.13 |
| 14 | 14 | 17.75 |
| 16 | 16 | 20.25 |
| 18 | 18 | 21.62 |
| 20 | 20 | 23.88 |
| 24 | 24 | 28.25 |
| NPS | ID | OD |
|---|---|---|
| 26 | 26 | 30.5 |
| 28 | 28 | 32.75 |
| 30 | 30 | 34.75 |
| 32 | 32 | 37 |
| 34 | 34 | 39 |
| 36 | 36 | 41.25 |
| 38 | 38 | 43.75 |
| 40 | 40 | 45.75 |
| 42 | 42 | 48 |
| 44 | 44 | 50.25 |
| 46 | 46 | 52.25 |
| 48 | 48 | 54.5 |
| 50 | 50 | 56.5 |
| 52 | 52 | 58.75 |
| 54 | 54 | 61 |
| 56 | 56 | 63.25 |
| 58 | 58 | 65.5 |
| 60 | 60 | 67.5 |
| NPS | ID | OD |
|---|---|---|
| 66¹ | 66 | 74.25 |
| 72¹ | 72 | 80.75 |
| 84¹ | 84 | 93.5 |
| 96¹ | 96 | 106.25 |
NPS = Nominal Pipe Size
ID = Inner Diameter
OD = Outer Diameter
General Note:
All dimensions are in inches.
Larger sizes as well as customized sizes can be furnished.
Bolt diameter should be 1/8″ less than the bolt hole size.
¹ For Reference Only:
Sizes NPS 66, 72, 84 and 96 are equal to Taylor-Forge Class 125
Standards:
ASME B16.5 – Pipe flanges and flanged fittings: NPS 4 through 24
ASME B16.47 – Large diameter steel flanges: NPS 26 through NPS 60 standard
No liability or guarantee for the correctness and completeness of the information provided
| NPS | ID | OD |
|---|---|---|
| 4 | 4.5 | 6.88 |
| 5 | 5.56 | 7.75 |
| 6 | 6.62 | 8.75 |
| 8 | 8.62 | 11 |
| 10 | 10.75 | 13.38 |
| 12 | 12.75 | 16.13 |
| 14 | 14 | 17.75 |
| 16 | 16 | 20.25 |
| 18 | 18 | 21.62 |
| 20 | 20 | 23.88 |
| 24 | 24 | 28.25 |
| NPS | ID | OD |
|---|---|---|
| 26 | 26 | 30.5 |
| 28 | 28 | 32.75 |
| 30 | 30 | 34.75 |
| 32 | 32 | 37 |
| 34 | 34 | 39 |
| 36 | 36 | 41.25 |
| 38 | 38 | 43.75 |
| 40 | 40 | 45.75 |
| 42 | 42 | 48 |
| 44 | 44 | 50.25 |
| 46 | 46 | 52.25 |
| 48 | 48 | 54.5 |
| 50 | 50 | 56.5 |
| 52 | 52 | 58.75 |
| 54 | 54 | 61 |
| 56 | 56 | 63.25 |
| 58 | 58 | 65.5 |
| 60 | 60 | 67.5 |
| NPS | ID | OD |
|---|---|---|
| 66¹ | 66 | 74.25 |
| 72¹ | 72 | 80.75 |
| 84¹ | 84 | 93.5 |
| 96¹ | 96 | 106.25 |
NPS = Nominal Pipe Size
ID = Inner Diameter
OD = Outer Diameter
General Note:
All dimensions are in inches.
Larger sizes as well as customized sizes can be furnished.
Bolt diameter should be 1/8″ less than the bolt hole size.
¹ For Reference Only:
Sizes NPS 66, 72, 84 and 96 are equal to Taylor-Forge Class 125
Standards:
ASME B16.5 – Pipe flanges and flanged fittings: NPS 4 through 24
ASME B16.47 – Large diameter steel flanges: NPS 26 through NPS 60 standard
No liability or guarantee for the correctness and completeness of the information provided
