GASKET DIMENSIONS FOR ANSI FLANGES
Ring Gaskets for 125/150# ANSI Pipe Flanges
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Ring Gaskets for 250/300# ANSI Pipe Flanges
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Full Face Gaskets for 125/150# ANSI Flanges
| Nominal Pipe Size | Gasket ID | Gasket OD | Number of Bolt Holes | Bolt Hole Diameter | Bolt Circle |
|---|---|---|---|---|---|
| 1/2" | 13/16 | 3-1/2 | 4 | 5/8 | 2-3/8 |
| 3/4" | 1-1/16 | 3-7/8 | 4 | 5/8 | 2-3/4 |
| 1" | 1-5/16 | 4-1/4 | 4 | 5/8 | 3-1/8 |
| 1-1/4" | 1-5/8 | 4-5/8 | 4 | 5/8 | 3-1/2 |
| 1-1/2" | 1-7/8 | 5 | 4 | 5/8 | 3-7/8 |
| 2" | 2-3/8 | 6 | 4 | 3/4 | 4-3/4 |
| 2-1/2" | 2-7/8 | 7 | 4 | 3/4 | 5-1/2 |
| 3" | 3-1/2 | 7-1/2 | 4 | 3/4 | 6 |
| 3-1/2" | 4 | 8-1/2 | 8 | 3/4 | 7 |
| 4" | 4-1/2 | 9 | 8 | 3/4 | 7-1/2 |
| 5" | 5-9/16 | 10 | 8 | 7/8 | 8-1/2 |
| 6" | 6-5/8 | 11 | 8 | 7/8 | 9-1/2 |
| 8" | 8-5/8 | 13-1/2 | 8 | 7/8 | 11-3/4 |
| 10" | 10-3/4 | 16 | 12 | 1 | 14-1/4 |
| 12" | 12-3/4 | 19 | 12 | 1 | 17 |
| 14" | 14 | 21 | 12 | 1-1/8 | 18-3/4 |
| 16" | 16 | 23-1/2 | 16 | 1-1/8 | 21-1/4 |
| 18" | 18 | 25 | 16 | 1-1/4 | 22-3/4 |
| 20" | 20 | 27-1/2 | 20 | 1-1/4 | 25 |
| 22" | 22 | 29-1/2 | 20 | 1-3/8 | 27-1/4 |
| 24" | 24 | 32 | 20 | 1-3/8 | 29-1/2 |
| 26" | 26 | 34-1/4 | 24 | 1-3/8 | 31-3/4 |
| 28" | 28 | 36-1/2 | 28 | 1-3/8 | 34 |
| 30" | 30 | 38-3/4 | 28 | 1-3/8 | 36 |
| 32" | 32 | 41-3/4 | 28 | 1-5/8 | 38-1/2 |
| 34" | 34 | 43-3/4 | 32 | 1-5/8 | 40-1/2 |
| 36" | 36 | 46 | 32 | 1-5/8 | 42-3/4 |
| 38" | 38 | 48-3/4 | 32 | 1-5/8 | 45-1/4 |
| 40" | 40 | 50-3/4 | 36 | 1-5/8 | 47-1/4 |
| 42" | 42 | 53 | 36 | 1-5/8 | 49-1/2 |
| 44" | 44 | 55-1/4 | 40 | 1-5/8 | 51-3/4 |
| 46" | 46 | 57-1/4 | 40 | 1-5/8 | 53-3/4 |
| 48" | 48 | 59-1/2 | 44 | 1-5/8 | 56 |
| 50" | 50 | 61-3/4 | 44 | 1-7/8 | 58-1/4 |
| 52" | 52 | 64 | 44 | 1-7/8 | 60-1/2 |
| 54" | 54 | 66-1/4 | 44 | 1-7/8 | 62-3/4 |
| 60" | 60 | 73 | 52 | 1-7/8 | 69-1/4 |
| 66" | 66 | 80 | 52 | 1-7/8 | 76 |
| 72" | 72 | 86-1/2 | 60 | 1-7/8 | 82-1/2 |
| 84" | 84 | 99-3/4 | 64 | 2-1/8 | 95-1/2 |
| 96" | 96 | 113-1/4 | 68 | 2-3/8 | 108-1/2 |
Full Face Gaskets for 250/300# ANSI Flanges
| Nominal Pipe Size | Gasket ID | Gasket OD | Number of Bolt Holes | Bolt Hole Diameter | Bolt Circle |
|---|---|---|---|---|---|
| 1" | 1-5/16 | 4-7/8 | 4 | 3/4 | 3-1/2 |
| 1-1/4" | 1-21/32 | 5-1/4 | 4 | 3/4 | 3-7/8 |
| 1-1/2" | 1-29/32 | 6-1/8 | 4 | 7/8 | 4-1/2 |
| 2" | 2-3/8 | 6-1/2 | 8 | 3/4 | 5 |
| 2-1/2" | 2-7/8 | 7-1/2 | 8 | 7/8 | 5-7/8 |
| 3" | 3-1/2 | 8-1/4 | 8 | 7/8 | 6-5/8 |
| 3-1/2" | 4 | 9 | 8 | 7/8 | 7-1/4 |
| 4" | 4-1/2 | 10 | 8 | 7/8 | 7-7/8 |
| 5" | 5-9/16 | 11 | 8 | 7/8 | 9-1/4 |
| 6" | 6-5/8 | 12-1/2 | 12 | 7/8 | 10-5/8 |
| 8" | 8-5/8 | 15 | 12 | 1 | 13 |
| 10" | 10-3/4 | 17-1/2 | 16 | 1-1/8 | 15-1/4 |
| 12" | 12-3/4 | 20-1/2 | 16 | 1-1/4 | 17-3/4 |
| 14" | 14 | 23 | 20 | 1-1/4 | 20-1/4 |
| 16" | 16 | 25-1/2 | 20 | 1-3/8 | 22-1/2 |
| 18" | 18 | 28 | 24 | 1-3/8 | 24-3/4 |
| 20" | 20 | 30-1/2 | 24 | 1-3/8 | 27 |
| 22" | 22 | 33 | 24 | 1-5/8 | 29-1/4 |
| 24" | 24 | 36 | 24 | 1-5/8 | 32 |
| 26" | 26 | 38-1/4 | 28 | 1-7/8 | 34-1/2 |
| 28" | 28 | 40-3/4 | 28 | 1-7/8 | 37 |
| 30" | 30 | 43 | 28 | 1-7/8 | 39-1/4 |
| 32" | 32 | 45-1/4 | 28 | 1-7/8 | 41-1/2 |
| 34" | 34 | 47-1/2 | 28 | 1-7/8 | 43-1/2 |
| 36" | 36 | 50 | 32 | 2-1/8 | 46 |
| 38" | 38 | 52-1/4 | 32 | 2-1/8 | 48 |
| 40" | 40 | 54-1/2 | 36 | 2-1/8 | 50-1/4 |
| 42" | 42 | 57 | 36 | 2-1/8 | 52-3/4 |
| 44" | 44 | 59-1/4 | 36 | 2-1/8 | 55 |
| 46" | 46 | 61-1/2 | 40 | 2-1/8 | 57-1/4 |
| 48" | 48 | 65 | 40 | 2-1/8 | 60-3/4 |
Dimensions for API Standard 605 (Class A) - 150# Flanges
| Nominal Pipe Size | Flange OD | Raised Face Diameter | Ring Gasket OD | Number of Bolt Holes | Bolt Hole Diameter | Bolt Circle |
|---|---|---|---|---|---|---|
| 26" | 30.94 | 28.00 | 28.56 | 36 | 0.88 | 29.31 |
| 28" | 32.94 | 30.00 | 30.56 | 40 | 0.88 | 31.31 |
| 30" | 34.94 | 32.00 | 32.56 | 44 | 0.88 | 33.31 |
| 32" | 37.06 | 34.00 | 34.68 | 48 | 0.88 | 35.44 |
| 34" | 39.56 | 36.25 | 36.81 | 40 | 1.00 | 37.69 |
| 36" | 41.62 | 38.25 | 38.88 | 44 | 1.00 | 39.75 |
| 38" | 44.25 | 40.25 | 41.13 | 40 | 1.12 | 42.12 |
| 40" | 46.25 | 42.50 | 43.13 | 44 | 1.12 | 44.12 |
| 42" | 48.25 | 44.50 | 45.13 | 48 | 1.12 | 46.12 |
| 44" | 50.25 | 46.50 | 47.13 | 52 | 1.12 | 48.12 |
| 46" | 52.81 | 48.62 | 49.44 | 40 | 1.25 | 50.56 |
| 48" | 54.81 | 50.75 | 51.44 | 44 | 1.25 | 52.56 |
| 50" | 56.81 | 52.75 | 53.44 | 48 | 1.25 | 54.56 |
| 52" | 58.81 | 54.75 | 55.44 | 52 | 1.25 | 56.56 |
| 54" | 61.00 | 56.75 | 57.63 | 56 | 1.25 | 58.75 |
| 56" | 63.00 | 58.75 | 59.63 | 60 | 1.25 | 60.75 |
| 58" | 65.94 | 60.75 | 62.19 | 48 | 1.38 | 63.44 |
| 60" | 67.94 | 63.00 | 64.19 | 52 | 1.38 | 65.44 |