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BS4504 Flanges Dimensions and Tolerances

BS 4504 Flanges Dimensions and Tolerances

DOWNLOAD BS 4504 FLANGES DIMENSIONS AND TOLERANCES PDF

Get Complete details of BS 4504 Flange Standard

  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
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