Carbon and Stainless Steel Flanges - ASME/ANSI Class 2500
ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 2500 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts
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ASME/ANSI B16.5-1996 Pipe Flanges and Flanged Fittings - Class 2500 Flanges - outside and inside diameters, bolt circles, numbers and diameters of bolts for Weld neck, Threaded, Slip-on, Lap joint, Socket weld and Blind flanges.
Carbon and stainless steel qualities according ASME B16.5 Table 1A.
| Pipe Size (inches) | Flange Outside Diameter (inches) | Pipe Outside Diameter (inches) | Number of Bolt Holes | Bolt Hole Diameter (inches) 1) | Bolt Circle (inches) |
|---|---|---|---|---|---|
| 1/2 | 5-1/4 | 0.84 | 4 | 7/8 | 3-1/2 |
| 3/4 | 5-1/2 | 1.05 | 4 | 7/8 | 3-3/4 |
| 1 | 6-1/4 | 1.32 | 4 | 1 | 4-1/4 |
| 1-1/4 | 7-1/4 | 1.66 | 4 | 1-1/8 | 5-1/8 |
| 1-1/2 | 8 | 1.90 | 4 | 1-1/4 | 5-3/4 |
| 2 | 9-1/4 | 2.38 | 8 | 1-1/8 | 6-3/4 |
| 2-1/2 | 10-1/2 | 2.88 | 8 | 1-1/4 | 7-3/4 |
| 3 | 12 | 3.50 | 8 | 1-3/8 | 9 |
| 4 | 14 | 4.50 | 8 | 1-5/8 | 10-3/4 |
| 5 | 16-1/2 | 5.56 | 8 | 1-7/8 | 12-3/4 |
| 6 | 19 | 6.63 | 8 | 2-1/8 | 14-1/2 |
| 8 | 21-3/4 | 8.63 | 12 | 2-1/8 | 17-1/4 |
| 10 | 26-1/2 | 10.75 | 12 | 2-5/8 | 21-1/4 |
| 12 | 30 | 12.75 | 12 | 2-7/8 | 24-3/8 |
1) Recommended bolts are 1/8 smaller than the nominal bolt hole diameters shown.
- 1 inch = 25.4 mm
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