BS 4504 Flanges Dimensions and Tolerances
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| Dimension | Range | Tolerance | |
| mm | |||
| Flange Facings | Eccentricity of machined facing diameters | < DN 100 | 1.0 |
| > DN 100 | 2.0 | ||
| a (type B facing height) | 2 mm | +0, -1.0 | |
| 3 mm | +0, -2.0 | ||
| 4 mm | +0, -3.0 | ||
| 5 mm | +0, -4.0 | ||
| 6 mm | +0, -5.0 | ||
| b (type C and E facing height) | All | +0.5, -0 | |
| b (type G facing height) | All | +0, -0.5 | |
| b (type H facing height, outer) | All | +0.2, -0 | |
| c (type D and F facing height) | All | +0, -0.5 | |
| d (type H facing height, inner) | All | +0.5, -0 | |
| B and E (facing diameters) | All | +0, -0.5 | |
| C and D (facing diameters) | All | +0.5, -0 | |
| Surface Finish | Facing types A, B, E and F | All, turning | Ra = 3.2 µm min 12.5 µm max |
| All, other than turning | Ra = 3.2 µm min 6.3 µm max | ||
| Facing types C, D, G and H | All | Ra = 0.8 µm min 3.2 µm max | |
| Flange Drilling Details | B (diameter of bolt circle) | Bolt sizes M10 to M24 | ±0.9 |
| Bolt sizes M27 to M45 | ±1.4 | ||
| Centre to centre of adjacent bolt holes | Bolt sizes M10 to M24 | ±0.45 | |
| Bolt sizes M27 to M45 | ±0.7 | ||
| All | A (outside diameter) | < DN 150 | ±2.0 |
| > DN 150 < DN 500 | ±3.0 | ||
| > DN 500 < DN 1200 | ±5.0 | ||
| > DN 1200 < DN 1800 | ±7.0 | ||
| > DN 1800 | ±10.0 | ||
| C (flange thickness, machined on both faces) | < 18 mm thickness | ±1.0 | |
| > 18 mm < 50 mm thickness | ±1.0 | ||
| > 50 mm thickness | ±1.0 | ||
| C (flange thickness, machined on front face) | < 18 mm thickness | +2.0, -1.0 | |
| > 18 mm < 50 mm thickness | +4.0, -1.5 | ||
| > 50 mm thickness | +7.0, -2.0 | ||
| Weld Neck Flanges, Code 111 | B (outside diameter of hub at welding end) | < DN 125 | +3.0, -0 |
| > DN 125 < DN 1200 | +4.5, -0 | ||
| > DN 1200 | +6.0, -0 | ||
| F (hub diameter) | < DN 50 | +0, -2.0 | |
| > DN 50 < DN 150 | +0, -4.0 | ||
| > DN 150 < DN 300 | +0, -6.0 | ||
| > DN 300 < DN 600 | +0, -8.0 | ||
| > DN 600 < DN 1200 | +0, -10.0 | ||
| D (length through hub) | < DN 80 | ±1.5 | |
| > DN 80 < DN 250 | ±2.0 | ||
| > DN 250 | ±3.0 | ||
| Slip on, Code 112 and Threaded,Code 113 | E (slip on flange hub diameter)B (threaded flange hub diameter) | < DN 50 | +1.0, -0 |
| > DN 50 < DN 150 | +2.0, -0 | ||
| > DN 150 < DN 300 | +4.0, -.0 | ||
| > DN 300 < DN 600 | +8.0, -0 | ||
| > DN 600 < DN 1200 | +12.0, -0 | ||
| > DN 1200 < DN 1800 | +16.0, -0 | ||
| > DN 1800 | +20.0, -0 | ||
| B (slip on bore diameter) | < DN 100 | +0.5, -0 | |
| > DN 100 < DN 400 | +1.0, .0 | ||
| > DN 400 < DN 600 | +1.5, .0 | ||
| > DN 600 | +3.0, -0 | ||
| D (length through hub) | Same as Weld Neck D | ||
| Blank Flanges, Code 105 | B (flange thickness) | Same as C for all other flanges | |
| C (unmachined centre portion) | Maximum specified | ||
BS4504 Flange Industries and Applications
Widely used in the industries
- Pumps, Valves, and vessels in manufacturing and food processing.
- Pipe connections in industrial waterworks.
- Heat exchangers and heating systems of all sizes.
- Mining support.
- Nuclear power systems.
- Plumbing and mechanical systems.
- Assemblies in the oil, gas, and petrochemical industries.
- Fire protection systems.
BS4504 Flange Supply and Export Network
List of Cities and Countries
| Afghanistan | Algeria | Angola | Argentina |
| Australia | Austria | Azerbaijan | Bahrain |
| Bangladesh | Belarus | Belgium | Bhutan |
| Bolivia | Brazil | Bulgaria | Canada |
| Chile | China | Colombia | Costa Rica |
| Croatia | Czech Republic | Aberdeen | Abu Dhabi |
| Ahmedabad | Ahvaz | Al Jubail | Al Khobar |
| Algiers | Ankara | Atyrau | Bangkok |
| Bengaluru | Bhopal | Bogota | Brisbane |
| Busan | Cairo | Calgary | Caracas |
| Chandigarh | Chennai | Chiyoda | Coimbatore |
| Colombo | Courbevoie |
| Denmark | Ecuador | Egypt | Estonia |
| Finland | France | Gabon | Ghana |
| Greece | Hong Kong | Hungary | India |
| Indonesia | Iran | Iraq | Israel |
| Italy | Japan | Jordan | Dallas |
| Dammam | Doha | Dubai | Edmonton |
| Ernakulam | Faridabad | Geoje-si | Gimhae-si |
| Granada | Gurgaon | Hanoi | Haryana |
| Ho Chi Minh City | Hong Kong | Houston | Howrah |
| Hyderabad | Indore | Istanbul | Jakarta |
| Jeddah |
| Kazakhstan | Kenya | Kuwait | Lebanon |
| Libya | Lithuania | Malaysia | Mexico |
| Mongolia | Morocco | Netherlands | New Zealand |
| Nigeria | Norway | Oman | Pakistan |
| Peru | Philippines | Poland | Portugal |
| Qatar | Romania | Russia | Karachi |
| Kolkata | Kuala Lumpur | Kuwait City | La Victoria |
| Lagos | Lahore | London | Los Angeles |
| Ludhiana | Madrid | Manama | Melbourne |
| Mexico City | Milan | Montreal | Moscow |
| Mumbai | Muscat | Navi Mumbai | New Delhi |
| New York | Noida | Perth | Petaling Jaya |
| Pimpri-Chinchwad | Port-of-Spain | Pune | Rajkot |
| Rio de Janeiro | Riyadh |
| Saudi Arabia | Serbia | Singapore | Slovakia |
| South Africa | South Korea | Spain | Sri Lanka |
| Sweden | Switzerland | Taiwan | Thailand |
| Trinidad & Tobago | Tunisia | Turkey | Ukraine |
| United Arab Emirates (UAE) | United Kingdom (UK) | United States (US) | Venezuela |
| Vietnam | Yemen | Santiago | Secunderabad |
| Seoul | Sharjah | Singapore | Surat |
| Sydney | Tehran | Thane | Thiruvananthapuram |
| Toronto | Ulsan | Vadodara | Visakhapatnam |
| Vung Tau |