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ANSI B16.5 Class 600 Forged Flanges
ANSI B16.5 Class 600 Forged Flanges ANSI B16.5 Class 600 Forged Flanges
Weld Neck Forged Flange Threaded Forged Flange 
Lap Joint Forged Flange Socket Weld Forged Flange 
Blind Forged Flange Slip On Forged Flange
| Nom. Pipe Size | O | T | R | X | #/Dia of Holesa | Bolt Circle Dia | B | B2b | B3 | H | L | L2 | L3c | r | C | D | Thr |
| ½ | 3.75 | 0.56 | 1.38 | 1.50 | 4-0.63 | 2.62 | 0.88 |  | 0.90 | 0.84 | 0.88 | 2.06 | 0.88 | 0.12 | 0.93 | 0.38 | 0.62 |
| ¾ | 4.62 | 0.62 | 1.69 | 1.88 | 4-0.75 | 3.25 | 1.09 | 1.11 | 1.05 | 1.00 | 2.25 | 1.00 | 0.12 | 1.14 | 0.44 | 0.62 | |
| 1 | 4.88 | 0.69 | 2.00 | 2.12 | 4-0.75 | 3.50 | 1.36 | 1.38 | 1.32 | 1.06 | 2.44 | 1.06 | 0.12 | 1.41 | 0.50 | 0.69 | |
| 1¼ | 5.25 | 0.81 | 2.50 | 2.50 | 4-0.75 | 3.88 | 1.70 | 1.72 | 1.66 | 1.12 | 2.62 | 1.12 | 0.19 | 1.75 | 0.56 | 0.81 | |
| 1½ | 6.12 | 0.88 | 2.88 | 2.75 | 4-0.88 | 4.50 | 1.95 | 1.97 | 1.90 | 1.25 | 2.75 | 1.25 | 0.25 | 1.99 | 0.62 | 0.88 | |
| 2 | 6.50 | 1.00 | 3.62 | 3.31 | 8-0.75 | 5.00 | 2.44 | 2.46 | 2.38 | 1.44 | 2.88 | 1.44 | 0.31 | 2.50 | 0.69 | 1.12 | |
| 2½ | 7.50 | 1.12 | 4.12 | 3.94 | 8-0.88 | 5.88 | 2.94 | 2.97 | 2.88 | 1.62 | 3.12 | 1.62 | 0.31 | 3.00 | 0.75 | 1.25 | |
| 3 | 8.25 | 1.25 | 5.00 | 4.62 | 8-0.88 | 6.62 | 3.57 | 3.60 | 3.50 | 1.81 | 3.25 | 1.81 | 0.38 | 3.63 | 0.81 | 1.38 | |
| 3½ | 9.00 | 1.38 | 5.50 | 5.25 | 8-1.00 | 7.25 | 4.07 | 4.10 | 4.00 | 1.94 | 3.38 | 1.94 | 0.38 | 4.13 | …. | 1.56 | |
| 4 | 10.75 | 1.50 | 6.19 | 6.00 | 8-1.00 | 8.50 | 4.57 | 4.60 | 4.50 | 2.12 | 4.00 | 2.12 | 0.44 | 4.63 | …. | 1.62 | |
| 5 | 13.00 | 1.75 | 7.31 | 7.44 | 8-1.12 | 10.50 | 5.66 | 5.69 | 5.56 | 2.38 | 4.50 | 2.38 | 0.44 | 5.69 | …. | 1.88 | |
| 6 | 14.00 | 1.88 | 8.50 | 8.75 | 12-1.12 | 11.50 | 6.72 | 6.75 | 6.63 | 2.62 | 4.62 | 2.62 | 0.50 | 6.75 | …. | 2.00 | |
| 8 | 16.50 | 2.19 | 10.62 | 10.75 | 12-1.25 | 13.75 | 8.72 | 8.75 | 8.63 | 3.00 | 5.25 | 3.00 | 0.50 | 8.75 | …. | 2.25 | |
| 10 | 20.00 | 2.50 | 12.75 | 13.50 | 16-1.38 | 17.00 | 10.88 | 10.92 | 10.75 | 3.38 | 6.00 | 4.38 | 0.50 | 10.88 | …. | 2.56 | |
| 12 | 22.00 | 2.62 | 15.00 | 15.75 | 20-1.38 | 19.25 | 12.88 | 12.92 | 12.75 | 3.62 | 6.12 | 4.62 | 0.50 | 12.94 | …. | 2.75 | |
| 14 | 23.75 | 2.75 | 16.25 | 17.00 | 20-1.50 | 20.75 | 14.14 | 14.18 | 14.00 | 3.69 | 6.50 | 5.00 | 0.50 | 14.19 | …. | 2.88 | |
| 16 | 27.00 | 3.00 | 18.50 | 19.50 | 20-1.63 | 23.75 | 16.16 | 16.19 | 16.00 | 4.19 | 7.00 | 5.50 | 0.50 | 16.19 | …. | 3.06 | |
| 18 | 29.25 | 3.25 | 21.00 | 21.50 | 20-1.75 | 25.75 | 18.18 | 18.20 | 18.00 | 4.62 | 7.25 | 6.00 | 0.50 | 18.19 | …. | 3.12 | |
| 20 | 32.00 | 3.50 | 23.00 | 24.00 | 20-1.75 | 28.50 | 20.20 | 20.25 | 20.00 | 5.00 | 7.50 | 6.50 | 0.50 | 20.19 | …. | 3.25 | |
| 22 | 34.25 | 3.75 | 25.25 | 26.25 | 24-1.75 | 30.63 | 22.22 | 22.25 | 22.00 | 5.25 | 7.75 | 6.88 | 0.50 | …. | …. | -- | |
| 24 | 37.00 | 4.00 | 27.25 | 28.25 | 24-2.00 | 33.00 | 24.25 | 24.25 | 24.00 | 5.50 | 8.00 | 7.25 | 0.50 | 24.19 | …. | 3.62 | |
| Dimensions are in inches. | |||||||||||||||||
| (a)- Bolt hole diameter 1/8 in. larger than bolt diameter. | |||||||||||||||||
| (b)- See bore chart for 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. | |||||||||||||||||