CLASS 900 FLANGE DIMENSIONS
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| Weld Neck Forged Flange | Threaded Forged Flange | Lap Joint Forged Flange |
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| Socket Weld Forged Flange | Blind Forged Flange | Slip On Forged Flange |
| Nom. Pipe Size | O | T | R | X | #/Dia of Holes a | Bolt Circle Dia | B | B2b | B3 | H | L | L2 | L3c | r | C | Thr |
| Sizes 1/2″ through 2 1/2″ are identical to class 1500. | ||||||||||||||||
| 3 | 9.5 | 1.5 | 5 | 5 | 8-1.00 | 7.5 | 3.57 |  |
3.6 | 3.5 | 2.12 | 4 | 2.12 | 0.38 | 3.63 | 1.62 |
| 4 | 11.5 | 1.75 | 6.19 | 6.25 | 8-1.25 | 9.25 | 4.57 | 4.6 | 4.5 | 2.75 | 4.5 | 2.75 | 0.44 | 4.63 | 1.88 | |
| 5 | 13.75 | 2 | 7.31 | 7.5 | 8-1.38 | 11 | 5.66 | 5.69 | 5.56 | 3.12 | 5 | 3.12 | 0.44 | 5.69 | 2.12 | |
| 6 | 15 | 2.19 | 8.5 | 9.25 | 12-1.25 | 12.5 | 6.72 | 6.75 | 6.63 | 3.38 | 5.5 | 3.38 | 0.5 | 6.75 | 2.25 | |
| 8 | 18.5 | 2.5 | 10.63 | 11.75 | 12-1.50 | 15.5 | 8.72 | 8.75 | 8.63 | 4 | 6.38 | 4.5 | 0.5 | 8.75 | 2.5 | |
| 10 | 21.5 | 2.75 | 12.75 | 14.5 | 16-1.50 | 18.5 | 10.88 | 10.92 | 10.75 | 4.25 | 7.25 | 5 | 0.5 | 10.88 | 2.81 | |
| 12 | 24 | 3.12 | 15 | 16.5 | 20-1.50 | 21 | 12.88 | 12.92 | 12.75 | 4.63 | 7.88 | 5.62 | 0.5 | 12.94 | 3 | |
| 14 | 25.25 | 3.38 | 16.25 | 17.75 | 20-1.63 | 22 | 14.14 | 14.18 | 14 | 5.12 | 8.38 | 6.12 | 0.5 | 14.19 | 3.25 | |
| 16 | 27.75 | 3.5 | 18.5 | 20 | 20-1.75 | 24.25 | 16.16 | 16.19 | 16 | 5.25 | 8.5 | 6.5 | 0.5 | 16.19 | 3.38 | |
| 18 | 31 | 4 | 21 | 22.25 | 20-2.00 | 27 | 18.18 | 18.2 | 18 | 6 | 9 | 7.5 | 0.5 | 18.19 | 3.5 | |
| 20 | 33.75 | 4.25 | 23 | 24.5 | 20-2.13 | 29.5 | 20.2 | 20.25 | 20 | 6.25 | 9.75 | 8.25 | 0.5 | 20.19 | 3.62 | |
| 24 | 41 | 5.5 | 27.25 | 29.5 | 20-2.63 | 35.5 | 24.25 | 24.25 | 24 | 8 | 11.5 | 10.5 | 0.5 | 24.19 | 4 | |
Dimensions are in inches.
(a)- Bolt hole diameter 1/8 in. larger than bolt diameter.
(b)- Standard bore dimensions provided. See bore chart for other wall thicknesses.
(c)- This dimension is commonly associated with “true” lap joints. Industry standard is to make to the slip on length through the hub.
Limitation of Liability and Disclaimer of Warranty: In no event will South Coast Industrial Metals or any of its affiliates be liable for any damages arising from the use of the information included in this document or that it is suitable for the ‘applications’ noted. We believe the information and data provided to be accurate to the best of our knowledge but, all data is considered typical values only. It is intended for reference and general information and not recommended for specification, design or engineering purposes. South Coast Industrial Metals, Inc. assumes no implied or express warranty in regard to the creation or accuracy of the data provided in this document.