ANSI B 16.1 CLASS 125 Slip On Flanges Add Flanges
| Nominal Size |
Outside Diameter (OD) |
Thickness (T) |
Diameter at Base (E) |
Bore (B) |
LTH (L) |
Drilling - Bolt Circle (BC) |
Drilling - Hole Diameter | Drilling - No. of Holes |
Weight (lbs) |
|---|---|---|---|---|---|---|---|---|---|
| 26 | 34.25 | 2 | 28.5 | 26.19 | 3.375 | 31.75 | 1.375 | 24 | 235 |
| 28 | 36.5 | 2.062 | 30.75 | 28.19 | 3.438 | 34 | 1.375 | 28 | 269 |
| 30 | 38.75 | 2.125 | 32.75 | 30.19 | 3.5 | 36 | 1.375 | 28 | 303 |
| 32 | 41.75 | 2.25 | 35 | 32.19 | 3.625 | 38.5 | 1.625 | 28 | 375 |
| 34 | 43.75 | 2.312 | 37 | 34.19 | 3.688 | 40.5 | 1.625 | 32 | 401 |
| 36 | 46 | 2.375 | 39.25 | 36.19 | 3.75 | 42.75 | 1.625 | 32 | 452 |
| 38 | 48.75 | 2.375 | 41.75 | 38.19 | 3.75 | 45.25 | 1.625 | 32 | 528 |
| 40 | 50.75 | 2.5 | 43.75 | 40.19 | 3.875 | 47.25 | 1.625 | 36 | 573 |
| 42 | 53 | 2.625 | 46 | 42.19 | 4 | 49.5 | 1.625 | 36 | 648 |
| 44 | 55.25 | 2.625 | 48 | 44.19 | 4 | 51.75 | 1.625 | 40 | 688 |
| 46 | 57.25 | 2.688 | 50 | 46.19 | 4.062 | 53.75 | 1.625 | 40 | 733 |
| 48 | 59.5 | 2.75 | 52.25 | 48.19 | 4.125 | 56 | 1.625 | 44 | 799 |
| 50 | 61.75 | 2.75 | 54.25 | 50.19 | 4.125 | 58.25 | 1.875 | 44 | 827 |
| 52 | 64 | 2.875 | 56.5 | 52.19 | 4.25 | 60.5 | 1.875 | 44 | 922 |
| 54 | 66.25 | 3 | 58.75 | 54.19 | 4.375 | 62.75 | 1.875 | 44 | 1024 |
| 60 | 73 | 3.125 | 65.25 | 60.19 | 4.5 | 69.25 | 1.875 | 52 | 1253 |
| 66 | 80 | 3.375 | 71.5 | 66.19 | 4.875 | 76 | 1.875 | 52 | 1623 |
| 72 | 86.5 | 3.5 | 78.5 | 72.19 | 5 | 82.5 | 1.875 | 60 | 1922 |
| 78 | 93 | 3.875 | 84.5 | 78.19 | 5.375 | 89 | 2.125 | 64 | 2279 |
| 84 | 99.75 | 3.875 | 90.5 | 84.19 | 5.375 | 95.5 | 2.125 | 64 | 2586 |
| 90 | 106.5 | 4.25 | 96.75 | 90.19 | 5.75 | 102 | 2.438 | 68 | 3061 |
| 96 | 113.25 | 4.25 | 102.75 | 96.19 | 5.75 | 108.5 | 2.438 | 68 | 3432 |
Notes
Dimensions are in inches.
ANSI B16.1 is a gray iron pipe flange and fitting specification.
Steel flanges are occasionally produced to mate up with Class 125 and Class 250 valves
These flange dimensions are provided for reference even though specification does not cover steel.
These flanges are typically supplied with a flat face.