Wire Diameter (d)
Mesh Count (n)
Open Area %
Space between adjacent parallel wires, in mm.
(25.4 / n) – d
Diameter of wire before weaving, in mm.
Number of apertures per lineal inch measured from the centre of one wire to a point 1 inch (25.4 mm) distant.
25.4 / (w + d)
Distance between the centres of two adjacent wires in mm.
w + d or 25.4 / n
Wires running lengthwise in the cloth as woven.
Wires running crosswise in the cloth as woven.
The fractional open surface area of the wirecloth in the flow direction
(w²) / (w + d)² * 100 (applicable for square meshes only).
The fractional void volume of the mesh.