Wire Mesh Opening Aperture Tolerance
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      Formulas provided below were derived from ASTM E2016-15   Mesh Count Tolerance  
1     The allowable deviation in the mesh count shall be applied separately for warp and shute (weft) directions in accordance with the table below:      1
2    

 ASTM E2016 - 15   Table 7 Tolerance in Mesh Count

Mesh

Warp

Shute

Coarser than 30 mesh, incl

+/-  2%

+/-  5%

Over 30 to 200 mesh, incl

+/-  2%

+/-  4%

Finer than 200 mesh

+/-  3%

+/-  4%

2
3    
  Note: (A) "Warp" 'The Length Direction as Woven 
    “Shute” The direction across the width of the weave (at a right angle to the Warp Direction) 
3
4     This information was based on a standard wire cloth product specification :   P/N: 80X80-0-0055-T-304-PW 4
5     80 X 80 Mesh, 0.0055" Diameter Stainless Steel, Plain Woven Wire Cloth    5
6     Formula to calculate the nominal opening: size:       1 / 80 – 0.0055 = 0.007” Opening Size 6
7       7
8   1. Convert the warp tolerance +/- 2% into number of meshes per lineal inch. 8
9     80 Mesh Warp + 2%   80 x .02 = 1.6,   80 + 1.6 = 81.6 Mesh 9
10     80 Mesh Warp - 2%    80 x .02 = 1.6,   80  - 1.6 = 78.4 Mesh 10
        11
12   2 Compute the opening size based on a mesh count of 81.6 12
13     Opening = (1 / # Wires per Inch) - Wire Diameter 13
14     1 / 81.6 – 0.0055” = 0.006754” Minimum Warp Opening Size 14
15       15
16   3 Compute the opening size based on a mesh count of 78.4 16
17     Opening = (1 / # Wires per Inch) - Wire Diameter 17
18     1 / 78.4 – 0.0055” = 0.007255” Maximum Warp Opening Size 18
19       19
20   4. Convert the shute tolerance +/- 4% into number of meshes per lineal inch. 20
21     80 Mesh Shute + 4%   80 x .04 = 3.2   80 + 3.2 = 83.2 Mesh 21
22     80 Mesh Shute -  4%   80 x .04 = 3.2   80 - 3.2 = 76.8 Mesh 22
23       23
24   5. Compute the opening size based on a mesh count of 83.2 24
25     Opening = (1 / # Wires per Inch ) - Wire Diameter 25
26     1 / 83.2 – 0.0055” = 0.006519” Minimum Shute Opening Size  26
27       27
28   6. Compute the opening size based on a mesh count of 76.8 28
29     1 / 76.8 – 0.0055” = 0.007520” Maximum Shute Opening Size 29
30       30
31   7. Convert Maximum/Minimum Warp Opening Dimensions to a +/- Tolerance 31
32     0.007255” - 0.006754” =  0.0005”     Warp Opening Tolerance  0.0005”/2 = +/- 0.00025" 32
33       33
34   8. Convert Maximum/Minimum Shute Opening Dimensions to a +/- Tolerance 34
35     0.007520” – 0.006519” =  0.001”     Shute Opening Tolerance   0.001”/2 = +/- 0.0005" 35
           
         
 
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Last modified: January 30, 2016