ANSI B16.5 Class 900 Socket-Weld Flanges
| Nominal Pipe Size | Outside Diameter (O) | Thickness (T) | Raised Face Diameter (R) | Length Thru Hub (Y) | Hub Diameter (X) | Bore (B1) | Bore (B2) | Depth of Socket (D) | Approximate Weight | Bolt Circle (C) | Number of Holes | Diameter of Holes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1/2 | 4.75 mm | 0.88 mm | 1.38 mm | 1.25 mm | 1.50 mm | Specified by purchaser | 0.88 mm | 0.38 mm | 4 lb | 3.25 mm | 4 | 0.88 mm |
| 3/4 | 5.13 mm | 1.00 mm | 1.69 mm | 1.38 mm | 1.75 mm | Specified by purchaser | 1.09 mm | 0.44 mm | 5 lb | 3.50 mm | 4 | 0.88 mm |
| 1 | 5.88 mm | 1.13 mm | 2.00 mm | 1.63 mm | 2.06 mm | Specified by purchaser | 1.36 mm | 0.50 mm | 8 lb | 4.00 mm | 4 | 1.00 mm |
| 1 1/4 | 6.25 mm | 1.13 mm | 2.50 mm | 1.63 mm | 2.50 mm | Specified by purchaser | 1.70 mm | 0.56 mm | 9 lb | 4.38 mm | 4 | 1.00 mm |
| 1 1/2 | 7.00 mm | 1.25 mm | 2.88 mm | 1.75 mm | 2.75 mm | Specified by purchaser | 1.95 mm | 0.63 mm | 12 lb | 4.88 mm | 4 | 1.13 mm |
| 2 | 8.50 mm | 1.50 mm | 3.63 mm | 2.25 mm | 4.13 mm | Specified by purchaser | 2.44 mm | 0.69 mm | 25 lb | 6.50 mm | 8 | 1.00 mm |
| 2 1/2 | 9.63 mm | 1.63 mm | 4.13 mm | 2.50 mm | 4.88 mm | Specified by purchaser | 2.94 mm | 0.75 mm | 36 lb | 7.50 mm | 8 | 1.13 mm |