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BRITISH STANDARD PIPE FLANGES
DIMENSION OF PIPE FLANGES AS PER
TABLE BS-10
| Table D for W. Steam Pressure upto 50 lbs per Sq. Inch | Table E for W. Steam Pressure 50 lbs and upto 100 lbs per Sq. Inch | ||||||||||||
| Nominal Pipe Size |
O.D.
of Pipe |
Dia.
of Flange |
Dia.
of Bolt Circle |
No.
of Bolt |
Dia.
of Bolt |
Thickness | Nominal Pipe Size |
Dia. of Flange |
Dia. of Bolt Circle |
No. of Bolt |
Dia. of Bolt |
Thickness | |
| 1/2" | 27/32" | 3.3/4" | 2.5/8" | 4 | 1/2" | 3/16" | 1/2" | 3.3/4" | 2.5/8" | 4 | 1/2" | 1/4" | |
| 3/4" | 1.1/16" | 4" | 2.7/8" | 4 | 1/2" | 3/16" | 3/4" | 4" | 2.7/8" | 4 | 1/2" | 1/4" | |
| 1" | 1.11/32" | 4.1/2" | 3.1/4" | 4 | 1/2" | 3/16" | 1" | 4.1/2" | 3.1/4" | 4 | 1/2" | 9/32" | |
| 1.1/4" | 1.11/16" | 4.3/4" | 3.7/16" | 4 | 1/2" | 1/4" | 1.1/4" | 4.3/4" | 3.7/16" | 4 | 1/2" | 5/16" | |
| 1.1/2" | 1.29/32" | 5.1/4" | 3.7/8" | 4 | 1/2" | 1/4" | 1.1/2" | 5.1/4" | 3.7/8" | 4 | 1/2" | 11/32" | |
| 2" | 2.3/8" | 6" | 4.1/2" | 4 | 5/8" | 5/16" | 2" | 6" | 4.1/2" | 4 | 5/8" | 3/8" | |
| 2.1/2 | 3" | 6.1/2" | 5" | 4 | 5/8" | 5/16" | 2.1/2" | 6.1/2" | 5" | 4 | 5/8" | 13/32" | |
| 3" | 3.1/2" | 7.1/4" | 5.3/4" | 4 | 5/8" | 3/8" | 3" | 7.1/4" | 5.3/4" | 4 | 5/8" | 7/16" | |
| 3.1/2" | 4" | 8" | 6.1/2" | 4 | 5/8" | 3/8" | 3.1/2" | 8" | 6.1/2" | 8 | 5/8" | 15/32" | |
| 4" | 4.1/2" | 8.1/2" | 7" | 4 | 5/8" | 3/8" | 4" | 8.1/2" | 7" | 8 | 5/8" | 1/2" | |
| 5" | 5.1/2" | 10" | 8.1/4" | 8 | 5/8" | 1/2" | 5" | 10" | 8.1/4" | 8 | 5/8" | 9/16" | |
| 6" | 6.1/2" | 11" | 9.1/4" | 8 | 5/8" | 1/2" | 6" | 11" | 9.1/4" | 8 | 3/4" | 11/16" | |
| 7" | 7.1/2" | 12" | 10.1/4" | 8 | 5/8" | 1/2" | 7" | 12" | 10.1/4" | 8 | 3/4" | 3/4" | |
| 8' | 8.5/8" | 13.1/4" | 11.1/2" | 8 | 5/8" | 1/2" | 8" | 12.1/4" | 11.1/2" | 8 | 3/4" | 3/4" | |
| 9" | 9.5/8" | 14.1/2" | 12.3/4" | 8 | 5/8" | 5/8" | 9" | 14.1/2" | 12.3/4" | 12 | 3/4" | 13/16" | |
| 10" | 10.3/4" | 16" | 14" | 8 | 3/4" | 5/8" | 10" | 16" | 14" | 12 | 3/4" | 7/8" | |
| 12" | 12.3/4" | 18" | 16" | 12 | 3/4" | 5/8" | 12" | 18" | 16" | 12 | 7/8" | 1" | |
| 14" | 14" | 20.3/4" | 18.1/2" | 12 | 7/8" | 3/4" | 4" | 20.3/4" | 18.1/2" | 12 | 7/8" | 1" | |
| 16" | 16" | 22.3/4" | 20.1/2" | 12 | 7/8" | 3/4" | 6" | 22.3/4" | 20.1/2" | 12 | 7/8" | 1" | |
| 18" | 18" | 25.1/4" | 23" | 12 | 7/8" | 7/8" | 18" | 25.1/4" | 23" | 16 | 7/8" | 1.1/8" | |
| 20" | 20" | 27.3/4" | 25.1/4" | 16 | 7/8" | 1" | 20" | 27.3/4" | 25.1/4" | 16 | 7/8" | 1.1/4" | |
| 24" | 24" | 32.1/2" | 29.3/4" | 16 | 1" | 1.1/8" | 24" | 32.1/2" | 29.3/4" | 16 | 1" | 1.1/2" | |
| Table F for W. Steam Pressure 100 lbs per Sq. Inch | Table
H for W. Steam Pressure 150 lbs and upto 250 lbs per Sq. Inch |
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| Nominal Pipe Size |
Dia.
of Flange |
Dia.
of Bolt Circle |
No.
of Bolt |
Dia.
of Bolt |
Thickness | Nominal Pipe Size |
Dia. of Flange |
Dia. of Bolt Circle |
No. of Bolt |
Dia. of Bolt |
Thickness | |
| 1/2" | 3.3/4" | 2.5/8" | 4 | 1/2" | 3/8" | 1/2" | 4.1/2" | 3.1/4" | 4 | 5/8" | 1/2" | |
| 3/4" | 4" | 2.7/8" | 4 | 1/2" | 3/8" | 3/4" | 4.1/2" | 3.1/4" | 4 | 5/8" | 1/2" | |
| 1" | 4.3/4" | 3.7/16" | 4 | 5/8" | 3/8" | 1" | 4.3/4" | 33.7/16" | 4 | 5/8" | 9/16" | |
| 1.1/4" | 5.1/4" | 3.7/8" | 4 | 5/8" | 1/2" | 1.1/4" | 5.1/4" | 3.7/8" | 4 | 5/8" | 11/16" | |
| 1.1/2" | 5.1/2" | 4.1/8" | 4 | 5/8" | 1/2" | 1.1/2" | 5.1/2" | 4.1/8" | 4 | 5/8" | 11/16" | |
| 2" | 6.1/2" | 5" | 4 | 5/8" | 5/8" | 2" | 6.1/2" | 5" | 4 | 5/8" | 3/4" | |
| 2.1/2 | 7.1/4" | 5.3/4" | 8 | 5/8" | 5/8" | 2.1/2" | 7.1/4" | 5.3/4" | 8 | 5/8" | 3/4" | |
| 3" | 8" | 6.1/2" | 8 | 5/8" | 5/8" | 3" | 8" | 6.1/2" | 8 | 5/8" | 7/8" | |
| 3.1/2" | 8.1/2" | 7" | 8 | 5/8" | 3/4" | 3.1/2" | 8.1/2" | 7" | 8 | 5/8" | 7/8" | |
| 4" | 9" | 7.1/2" | 8 | 5/8" | 3/4" | 4" | 9" | 7.1/2" | 8 | 5/8" | 1" | |
| 5" | 11" | 9.1/4" | 8 | 3/4" | 7/8" | 5" | 11" | 9.1/4" | 8 | 3/4" | 1.1/8" | |
| 6" | 12" | 10.1/4" | 12 | 3/4" | 7/8" | 6" | 12" | 10.1/4" | 12 | 3/4" | 1.1/8" | |
| 7" | 13.1/4" | 11.1/2" | 12 | 3/4" | 7/8" | 7" | 13.1/4" | 11.1/2" | 12 | 3/4" | 1.1/4" | |
| 8' | 14.1/2" | 12.3/4" | 12 | 3/4" | 1" | 8" | 14.1/2" | 12.3/4" | 12 | 3/4" | 1.1/4" | |
| 9" | 16" | 14" | 12 | 7/8" | 1" | 9" | 16" | 14" | 12 | 7/8" | 1.3/8" | |
| 10" | 17" | 15" | 12 | 7/8" | 1" | 10" | 17" | 15" | 12 | 7/8" | 1.3/8" | |
| 12" | 19.1/4" | 17.1/4" | 16 | 7/8" | 1/1/8" | 12" | 19.1/4" | 17.1/4" | 16 | 7/8" | 1.1/2" | |
| 14" | 21.3/4" | 19.1/2" | 16 | 1" | 1.1/4" | 4" | 21.3/4" | 19.1/2" | 16 | 1" | 1.5/8" | |
| 16" | 24" | 21.3/4" | 20 | 1" | 1.1/4" | 6" | 24" | 21.3/4" | 20 | 1" | 1.3/4" | |
| 18" | 26.1/2" | 24" | 20 | 1.1/8" | 1.3/8" | 18" | 26.1/2" | 24" | 20 | 1.1/8" | 1.7/8" | |
| 20" | 29" | 26.1/2" | 24 | 1.1/8" | 1.1/2" | 20" | 29" | 26.1/2" | 24 | 1.1/8" | 2" | |
| 24" | 33.1/2" | 30.3/4" | 24 | 1.1/4" | 1.5/8" | 24" | 33.1/2" | 30.3/4" | 24 | 1.1/4" | 2.1/4" | |
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