Tolerances for standard sieves

The apertures for the British Standard 400 mesh are 37.5 pm with a nominal wire thickness of 26 pm. On the basis of Table 4.1, in which a selection of sieve dimensions are shown, the (nominal) 75 pm sieve has a 

Woven wire sieves, having apertures ranging from 20 pm to 125 mm, are readily available in 100, 200, 300 and 450 mm diameters frames as well as 3, 8, 12 and 18 in diameters. Microplate sieves are available in 100 and 200 mm diameters with round or square apertures ranging from 1 to 125 mm. Endecottes test sieves have at least five intermediate and one final inspection in which wire cloth dimensions are inspected by projector. 

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