Flange dimensions and weights to the ANSI/ASME B16.47 Series A Class 300 standard. Every size we list is one we manufacture and ship, with custom sizes and modifications available on request.
Instant per-flange weight
Sizes, counts, lengths
Dimensional tolerances
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Select a material and flange type to view the ANSI/ASME B16.47 Series A Class 300 Flange Dimensions, including outside diameter, bolt circle, number and size of bolt holes, and thickness.
| Nominal Pipe Size | O.D. (O) | Flange THK (tf) | Length Thru Hub (Y) | Hub Dia (X) | Hub Top Dia (A) | R.F. Dia (R) | Bolt Circle | No. Bolts | Bolt Hole Dia | Bolt Dia | Fillet Radius (r1) | Bolt Length (L) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 26 | 38.25 | 3.07 | 7.19 | 28.38 | 26.00 | 29.50 | 34.50 | 28 | 1.750 | 1.625 | 0.38 | 10.50 |
| 28 | 40.75 | 3.32 | 7.69 | 30.50 | 28.00 | 31.50 | 37.00 | 28 | 1.750 | 1.625 | 0.44 | 11.00 |
| 30 | 43.00 | 3.57 | 8.19 | 32.56 | 30.00 | 33.75 | 39.25 | 28 | 1.875 | 1.750 | 0.44 | 11.75 |
| 32 | 45.25 | 3.82 | 8.69 | 34.69 | 32.00 | 36.00 | 41.50 | 28 | 2.000 | 1.875 | 0.44 | 12.75 |
| 34 | 47.50 | 3.94 | 9.07 | 36.88 | 34.00 | 38.00 | 43.50 | 28 | 2.000 | 1.875 | 0.50 | 13.00 |
| 36 | 50.00 | 4.07 | 9.44 | 39.00 | 36.00 | 40.25 | 46.00 | 32 | 2.125 | 2.000 | 0.50 | 13.50 |
| 38 | 46.00 | 4.19 | 7.06 | 39.12 | 38.00 | 40.50 | 43.00 | 32 | 1.625 | 1.500 | 0.50 | 12.50 |
| 40 | 48.75 | 4.44 | 7.56 | 41.25 | 40.00 | 42.75 | 45.50 | 32 | 1.750 | 1.625 | 0.50 | 13.25 |
| 42 | 50.75 | 4.63 | 7.82 | 43.25 | 42.00 | 44.75 | 47.50 | 32 | 1.750 | 1.625 | 0.50 | 13.75 |
| 44 | 53.25 | 4.82 | 8.06 | 45.25 | 44.00 | 47.00 | 49.75 | 32 | 1.875 | 1.750 | 0.50 | 14.50 |
| 46 | 55.75 | 5.00 | 8.44 | 47.38 | 46.00 | 49.00 | 52.00 | 28 | 2.000 | 1.875 | 0.50 | 15.00 |
| 48 | 57.75 | 5.19 | 8.75 | 49.38 | 48.00 | 51.25 | 54.00 | 32 | 2.000 | 1.875 | 0.50 | 15.50 |
| 50 | 60.25 | 5.44 | 9.07 | 51.38 | 50.00 | 53.50 | 56.25 | 32 | 2.125 | 2.000 | 0.50 | 16.00 |
| 52 | 62.25 | 5.63 | 9.32 | 53.38 | 52.00 | 55.50 | 58.25 | 32 | 2.125 | 2.000 | 0.50 | 16.50 |
| 54 | 65.25 | 5.94 | 9.88 | 55.50 | 54.00 | 57.75 | 61.00 | 28 | 2.375 | 2.250 | 0.50 | 17.50 |
| 56 | 67.25 | 6.00 | 10.19 | 57.62 | 56.00 | 59.75 | 63.00 | 28 | 2.375 | 2.250 | 0.50 | 17.75 |
| 58 | 69.25 | 6.19 | 10.44 | 59.62 | 58.00 | 62.00 | 65.00 | 32 | 2.375 | 2.250 | 0.50 | 18.25 |
| 60 | 71.25 | 6.38 | 10.69 | 61.62 | 60.00 | 64.00 | 67.00 | 32 | 2.375 | 2.250 | 0.50 | 18.75 |
Each table lists, per nominal size: outside diameter, thickness, bolt circle, number of bolts, bolt-hole size, bolt size, bore and approximate weight. Dimensions follow the governing ANSI/ASME and AWWA standards; weights vary by flange type and facing.
We manufacture to your specifications and stock domestic AIS/Buy America and imported materials, with galvanized, epoxy, and additional coatings available. Rubber expansion joints and gaskets are also supplied on request.
ANSI/ASME B16.47 is divided into Series A and Series B.
Key differences:
Key Similarities:
Not usually.
Series B flanges typically use a smaller bolt circle and commonly use more bolts of a smaller size, while Series A flanges tend to use fewer bolts in larger sizes. Bolt size and quantity are defined by the standard for the specific NPS and class, so always verify the bolt pattern and hardware requirements per the specified Series and pressure class.
