Dimensions for PIPE FLANGE GASKETS to suit ASME B16.21 Forged Steel Flanges
All Dimensions in Inches.
| Nom. Pipe Size | All Class I.D. | Class 150# O.D. | Class 300# O.D. | Class 400# O.D. | Class 600# O.D. | Class 900# O.D. | Class 1500# O.D. | Class 2500# O.D. |
|---|---|---|---|---|---|---|---|---|
| ½ | 27/32 | 1 7/8 | 2 1/8 | 2 1/8 | 2 1/8 | 2 1/2 | 2 1/2 | 2 3/4 |
| ¾ | 1 1/16 | 2 1/4 | 2 5/8 | 2 5/8 | 2 5/8 | 2 3/4 | 2 3/4 | 3 |
| 1 | 1 5/16 | 2 5/8 | 2 7/8 | 2 7/8 | 2 7/8 | 3 1/8 | 3 1/8 | 3 3/8 |
| 1 ¼ | 1 21/32 | 3 | 3 1/4 | 3 1/4 | 3 1/4 | 3 1/2 | 3 1/2 | 4 1/4 |
| 1 ½ | 1 29/32 | 3 3/8 | 3 3/4 | 3 3/4 | 3 3/4 | 3 7/8 | 3 7/8 | 4 5/8 |
| 2 | 2 3/8 | 4 1/8 | 4 3/8 | 4 3/8 | 4 3/8 | 5 5/8 | 5 5/8 | 5 3/4 |
| 2 ½ | 2 7/8 | 4 7/8 | 5 1/8 | 5 1/8 | 5 1/8 | 6 1/2 | 6 1/2 | 6 5/8 |
| 3 | 3 1/2 | 5 3/8 | 5 7/8 | 5 7/8 | 5 7/8 | 6 5/8 | 6 7/8 | 7 3/4 |
| 3 1/2 | 4 | 6 3/8 | 6 1/2 | 6 3/8 | 6 3/8 | |||
| 4 | 4 1/2 | 6 7/8 | 7 1/8 | 7 | 7 5/8 | 8 1/8 | 8 1/8 | 9 1/4 |
| 5 | 5 9/16 | 7 3/4 | 8 1/2 | 8 3/8 | 9 1/2 | 9 3/4 | 10 | 11 |
| 6 | 6 5/8 | 8 3/4 | 9 7/8 | 9 3/4 | 10 1/2 | 11 3/8 | 11 1/8 | 12 1/2 |
| 8 | 8 5/8 | 11 | 12 1/8 | 12 | 12 5/8 | 14 1/8 | 13 7/8 | 15 1/4 |
| 10 | 10 3/4 | 13 3/8 | 14 1/4 | 14 1/8 | 15 3/4 | 17 1/8 | 17 1/8 | 18 3/4 |
| 12 | 12 3/4 | 16 1/8 | 16 5/8 | 16 1/2 | 18 | 19 5/8 | 20 1/2 | 21 5/8 |
| 14 | 14 | 17 3/4 | 19 1/8 | 19 | 19 3/8 | 20 1/2 | 22 3/4 | |
| 16 | 16 | 20 1/4 | 21 1/4 | 21 1/8 | 22 1/4 | 22 5/8 | 25 1/4 | |
| 18 | 18 | 21 5/8 | 23 1/2 | 23 3/8 | 24 1/8 | 25 1/8 | 27 3/4 | |
| 20 | 20 | 23 7/8 | 25 3/4 | 25 1/2 | 26 7/8 | 27 1/2 | 29 3/4 | |
| 24 | 24 | 28 1/4 | 30 1/2 | 30 1/4 | 31 7/8 | 33 | 35 1/2 |