1. Conenction dimensions
The connection dimensions of a flange are: - the outer diameter D - bolt hole diameter k - the raised face diameter d₄ - number and diamter of the screws - the screw hole diameter d₂
The adjacent illustrations cover not all flange types; they are intended for the explanation of the connection dimensions only.
The designation of a flange connection with the nominal diameter 250 for a nominal pressure of 10 in the drawings and in production documents is as follow:
Flange connection 250 PN 10 DIN 2501
2. Screw hole arrangement: Every flange has a quantity of screw holes that is divisible by four.
The screw holes must be arranged on pipelines and valves in a way, that they are orientated symmetrically to the two main axes and that no holes protrude to them.
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