BS 4504 Flanges Dimensions and Tolerances

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	Dimension	Range	Tolerance
	Dimension	Range	mm
Flange Facings	Eccentricity of machined facing diameters	< DN 100	1.0
	Eccentricity of machined facing diameters	> 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
	Facing types A, B, E and F	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
	B (diameter of bolt circle)	Bolt sizes M27 to M45	±1.4
	Centre to centre of adjacent bolt holes	Bolt sizes M10 to M24	±0.45
	Centre to centre of adjacent bolt holes	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
Blank Flanges, Code 105	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

A-C D-J K-R S-Z

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