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| you are here: Home > Weldbend Catalog > Flanges > Class 125 Specifications |
| Class 125 Steel Pipe Flanges 30" - 48" |
| Dimensional Specifications & Bolt Patterns and Lengths |
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Nominal Pipe Size |
Outside Diameter (O) |
Thickness (C) |
Diameter at base of hub (X) |
Length Through Hub (Y) |
Bore (B) |
Diameter of hub at bevel (A) |
Approximate weight in pounds | |||
| Weld Neck | Slip-On |
Weld Neck |
Slip-On | Weld Neck | Slip-On | |||||
| 30 | 38.75 | 2.13 | 32.75 | 5.13 | 3.50 | 29.25 | 30.25 | 30 | 340 | 305 |
| 36 | 46.00 | 2.38 | 39.25 | 5.38 | 3.75 | 35.25 | 36.25 | 36 | 495 | 450 |
| 42 | 53.00 | 2.63 | 46.00 | 5.63 | 4.00 | 41.25 | 42.25 | 42 | 710 | 650 |
| 48 | 59.50 | 2.75 | 52.25 | 5.75 | 4.13 | 47.25 | 48.25 | 48 | 870 | 800 |
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Nominal Pipe Size |
Bolt Pattern and Bolt Lengths |
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Diameter of Bolt Circle |
Number of Bolt Holes |
Diameter of Bolt Holes | Diameter of Bolt | |
| 30 | 36 | 28 | 1.38 | 1.25 |
| 36 | 42.75 | 32 | 1.62 | 1.50 |
| 42 | 49.50 | 36 | 1.62 | 1.50 |
| 48 | 56 | 44 | 1.62 | 1.50 |
| Note: There is no standard for Class 125 as it is applicable to Cast Iron Standard ASA B16.1. These flanges correspond to ASA B16.1 in diameter, thickness, and drilling. Class 125 flanges are wide in face and used for connections to cast steel valves or equipment containing flanged ends made to Cast Iron Standard dimensions. Carbon steel bolting is intended and alloy studs should be avoided. Class 125 flanges are identical with Class E AWWA. |
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