Aperture Width is the distance between two adjacent wrap or weft wires,measured in projected plane at the mid-position.

Wire diameter is the diameter of the wire in the woven cloth (the wire diameter may be altered slightly during the weaving process)

Pitch is the distance between the middle point of the two adjacent wires or the sum of the aperture width and the wire diameter d.

Wrap: All wires running lengthwise of the cloth as woven.

Weft: All wires running across the cloth as woven.

The number of aperture per unit length  is the number of aperture which are counted in a row one behind the other for a given unit length.(the number of aperture with a length of 24.5 mm is designed as “Mesh”)

Mesh = number of aperture per English inch = 25.4/p

Open screening area A0: The percentage of area of all the aperture in the total screening surface or the ratio of the square of the nominal aperture width w and the square of the nominal pitch p (= w + d) , rounded to a full percentage value

Type of weave is the way in which the wrap and weft wires cross each others.

Weight G of the wire mesh screen section in kg per m²   G = Mesh*d²/ 2