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ANSI Flange Dimensions
Flange Standards
The most common flange standard in the oil and gas industry is arguably American National Standards Institute (ANSI) B16.5.
Other standards are used, e.g.
- British Imperial flanges BS 10,
- Metric flanges SABS 1123, BS 4504, DIN 2501,
- Japanese and Korean flanges JIS-B-2212, JIS-B-2214 & KS-B-1503
ANSI B16.5. Flange Dimensions
The following tables provide flange dimensions, diameters and drillings for the most common sizes and ratings.
| ANSI 150# |
| Pipe NB | Bolt PCD | No. of Bolts | Bolt Size | Flange OD |
| 1/2" | 2 3/8" | 4 | 1/2" | 3 1/2" |
| 1" | 3 1/8" | 4 | 1/2" | 4 1/4" |
| 2" | 4 3/4" | 4 | 5/8" | 6" |
| 4" | 7 1/2" | 8 | 5/8" | 9" |
| 6" | 9 1/2" | 8 | 3/4" | 11" |
| 8" | 11 3/4" | 8 | 3/4" | 13 1/2" |
| 10" | 14 1/4" | 12 | 7/8" | 16" |
| 12" | 17 " | 12 | 7/8" | 19" |
| 14" | 18 3/4" | 12 | 1" | 21" |
| ANSI 300# |
| Pipe NB | Bolt PCD | No. of Bolts | Bolt Size | Flange OD |
| 1/2" | 2 5/8" | 4 | 1/2" | 3 3/4" |
| 1" | 3 1/2" | 4 | 5/8" | 4 7/8" |
| 2" | 5" | 8 | 5/8" | 6 1/2" |
| 4" | 7 7/8" | 8 | 3/4" | 10" |
| 6" | 10 5/8" | 12 | 3/4" | 12 1/2" |
| 8" | 13" | 12 | 7/8" | 15" |
| 10" | 15 1/4" | 16 | 1" | 17 1/2" |
| 12" | 17 3/4" | 16 | 1 1/8" | 20 1/2" |
| 14" | 20 1/4" | 20 | 1 1/8" | 23" |
| ANSI 600# |
| Pipe NB | Bolt PCD | No. of Bolts | Bolt Size | Flange OD |
| 1/2" | 2 5/8" | 4 | 1/2" | 3 3/4" |
| 1" | 3 1/2" | 4 | 5/8" | 4 7/8" |
| 2" | 5" | 8 | 5/8" | 6 1/2" |
| 4" | 8 1/2" | 8 | 7/8" | 10 3/4" |
| 6" | 11 1/2" | 12 | 1" | 14" |
| 8" | 13 3/4" | 12 | 1 1/8" | 16 1/2" |
| 10" | 17" | 16 | 1 1/4" | 20" |
| 12" | 19 1/4" | 20 | 1 1/4" | 22" |
| 14" | 20 3/4" | 20 | 1 3/8" | 23 3/4" |
| ANSI 900# |
| Pipe NB | Bolt PCD | No. of Bolts | Bolt Size | Flange OD |
| 2" * | 6 1/2" | 8 | 7/8" | 8 1/2" |
| 4" | 9 1/4" | 8 | 1 1/8" | 11 1/2" |
| 6" | 12 1/2" | 12 | 1 1/8" | 15" |
| 8" | 15 1/2" | 12 | 1 3/8" | 18 1/2" |
| 10" | 18 1/2" | 16 | 1 3/8" | 21 1/2" |
| 12" | 21" | 20 | 1 3/8" | 24" |
| 14" | 22" | 20 | 1 1/2" | 25 1/4" |
| * 2" Class 1500 is used for 2" Class 900 |
| ANSI 1500# |
| Pipe NB | Bolt PCD | No. of Bolts | Bolt Size | Flange OD |
| 2" | 6 1/2" | 8 | 7/8" | 8 1/2" |
| 4" | 9 1/2" | 8 | 1 1/4" | 12 1/4" |
| 6" | 12 1/2" | 12 | 1 3/8" | 15 1/2" |
| 8" | 15 1/2" | 12 | 1 5/8" | 19" |
Flange Class Equivalents
The above tables reveal the following equivalences:
- Classes 300 & 600 for sizes 1/2", 3/4" and 1"
- Classes 900 to 1500 for sizes 1/2" to 2 1/2"
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