FLANGE TABLES - ONLINE SLIDE RULE & DATA SHEETS

DN

DN originates from the term ‘Diameter Nominale’.

It is a rough translation of mm for imperial sizes. It assumes that an inch is 25mm (which it is not, it is 25.4mm!!).

For example a 10” flange is referred to as 250mm in lieu of 254mm.

Even the ANSI imperial system is itself not exact in terms of bore size, hence it is termed ‘nominal bore’ as each class has a different bore. Note: metric ANSI equivalents are not different. However metric AS equivalents of BS can differ very slightly in bolt hole sizes to accommodate metric bolts.

PCD

One of the critical dimensions is the PCD of a flange.

PCD (Pitch Circle Diameter) represents the distance from the centre of two opposite bolt holes.

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