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DN = Nominal size, D = Outside Diameter, A = Outside Dia of Neck , B1 = Bore of Type 101 & 112 Flange, C1 = Thickness of Plate Flange,
C2 = Thickness of Weld_Neck and Boss Flange , N1 = Dia of Weld Neck , N2 = Dia of Boss ,R = corner Radius, H1 = Length of Boss Flange,
H2 = Length of Weld Neck Flange, H3 = Length of Neck :

Note: The flanges shown are only a small part of the range covered in BS 4504.

The Facings shown are type B (Raised Face). Other Facings include:
Type A..Flat: Type C..Tongue: Type D..Groove Type E..Spigot: :Type F..Recess: Type G..O-ring Recess: Type H.,0-ring Groove:

K = Bolt Circle Diameter, L = Dia Of Bolt Hole,
No = Number of Holes , Size = Size of Bolts