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Series A 150 Weld Neck Flange
ANSI B16.47 Series A Class 150 Flanges
ASME B16.47 Series A covers large diameter flanges, 26 inch through 60 inch, and carries the dimensions that came out of MSS SP-44. At the same size and class, a Series A flange has a larger outside diameter, a larger bolt circle and larger bolts, usually fewer of them, than Series B, so the two do not bolt to each other. When a large diameter line item comes in with no series named, Series A is the more common call and the safer one for avoiding a requote. The Class 150 table below lists weld neck and blind dimensions and weights. For the lighter pattern see Series B Class 150 dimensions, and for the full comparison see our Series A vs Series B guide.
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Series A 150 Blind Flange
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ASME B16.47 Series A Class 150 Weld Neck and Blind Flange Dimensions
| Thickness | Drilling | Weight | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Nom Size | OD | Weld Neck | Blind | OD of RF | Dia at Base | Bore | LTH | Dia Bevel | Bolt Circle | Bolt Length | HoleDia | # of Holes | Weld Neck | Blind |
| O | C | C | R | X | B | Y | A | (1) | (2) | |||||
| 26 | 34.25 | 2.63 | 2.63 | 29.5 | 26.62 | To be specified by purchaser | 4.69 | 26 | 31.75 | 8.75 | 1.38 | 24 | 300 | 702 |
| 28 | 36.5 | 2.75 | 2.75 | 31.5 | 28.62 | 4.88 | 28 | 34 | 9 | 1.38 | 28 | 345 | 833 | |
| 30 | 38.75 | 2.88 | 2.88 | 33.75 | 30.75 | 5.32 | 30 | 36 | 9.25 | 1.38 | 28 | 400 | 982 | |
| 32 | 41.75 | 3.13 | 3.13 | 36 | 32.75 | 5.63 | 32 | 38.5 | 10.5 | 1.62 | 28 | 505 | 1237 | |
| 34 | 43.75 | 3.19 | 3.19 | 38 | 34.75 | 5.82 | 34 | 40.5 | 10.5 | 1.62 | 32 | 540 | 1384 | |
| 36 | 46 | 3.5 | 3.5 | 40.25 | 36.75 | 6.13 | 36 | 42.75 | 11 | 1.62 | 32 | 640 | 1676 | |
| 38 | 48.75 | 3.38 | 3.38 | 42.25 | 39 | 6.13 | 38 | 45.25 | 11 | 1.62 | 32 | 720 | 1819 | |
| 40 | 50.75 | 3.5 | 3.5 | 44.25 | 41 | 6.38 | 40 | 47.25 | 11 | 1.62 | 36 | 775 | 2040 | |
| 42 | 53 | 3.75 | 3.75 | 47 | 43 | 6.69 | 42 | 49.5 | 11.5 | 1.62 | 36 | 890 | 2381 | |
| 44 | 55.25 | 3.94 | 3.94 | 49 | 45 | 6.94 | 44 | 51.75 | 12 | 1.62 | 40 | 990 | 2717 | |
| 46 | 57.25 | 4 | 4 | 51 | 47.12 | 7.25 | 46 | 53.75 | 12 | 1.62 | 40 | 1060 | 2961 | |
| 48 | 59.5 | 4.19 | 4.19 | 53.5 | 49.12 | 7.5 | 48 | 56 | 12.5 | 1.62 | 44 | 1185 | 3348 | |
| 50 | 61.75 | 4.32 | 4.32 | 55.5 | 51.25 | 7.94 | 50 | 58.25 | 13.25 | 1.88 | 44 | 1270 | 3716 | |
| 52 | 64 | 4.5 | 4.5 | 57.5 | 53.25 | 8.19 | 52 | 60.5 | 13.75 | 1.88 | 44 | 1410 | 4156 | |
| 54 | 66.25 | 4.69 | 4.69 | 59.5 | 55.25 | 8.44 | 54 | 62.75 | 14 | 1.88 | 44 | 1585 | 4639 | |
| 56 | 68.75 | 4.82 | 4.82 | 62 | 57.38 | 8.94 | 56 | 65 | 14.25 | 1.88 | 48 | 1760 | 5132 | |
| 58 | 71 | 5 | 5 | 64 | 59.38 | 9.19 | 58 | 67.25 | 14.75 | 1.88 | 48 | 1915 | 5675 | |
| 60 | 73 | 5.13 | 5.13 | 66 | 61.38 | 9.38 | 60 | 69.25 | 15 | 1.88 | 52 | 2045 | 6154 |
Dimensions are in inches. Weights are in pounds.
(1)- Bolt lengths are calculated based on bolting one WN to one Blind. (2)- Bolt diameter should be 1/8″ less than the bolt hole diameter
