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Sieve Designation Nominal Sieve Opening
Standard Mesh inches mm Microns
25.4 mm 1 in. 1 25.4 25400
22.6 mm 7/8 in. 0.875 22.6 22600
19.0 mm 3/4 in. 0.75 19 19000
16.0 mm 5/8 in. 0.625 16 16000
13.5 mm 0.530 in. 0.53 13.5 13500
12.7 mm 1/2 in. 0.5 12.7 12700
11.2 mm 7/16 in. 0.438 11.2 11200
9.51 mm 3/8 in. 0.375 9.51 9510
8.00 mm 5/16 in. 0.312 8 8000
6.73 mm 0.265 in. 0.265 6.73 6730
6.35 mm 1/4 in. 0.25 6.35 6350
5.66mm No.3 1/2 0.223 5.66 5660
4.76 mm No. 4 0.187 4.76 4760
4.00 mm No. 5 0.157 4 4000
3.36 mm No. 6 0.132 3.36 3360
2.83 mm No. 7 0.111 2.83 2830
2.38 mm No. 8 0.0937 2.38 2380
2.00 mm No. 10 0.0787 2 2000
1.68 mm No. 12 0.0661 1.68 1680
1.41 mm No. 14 0.0555 1.41 1410
1.19 mm No. 16 0.0469 1.19 1190
Sieve Designation Nominal Sieve Opening
Standard Mesh inches mm Microns
1.00 mm No. 18 0.0394 1 1000
841 mm No. 20 0.0331 0.841 841
707 mm No. 25 0.0278 0.707 707
595 mm No. 30 0.0234 0.595 595
500 mm No. 35 0.0197 0.5 500
420 mm No. 40 0.0165 0.42 420
354 mm No. 45 0.0139 0.354 354
297 mm No. 50 0.0117 0.297 297
250 mm No. 60 0.0098 0.25 250
210 mm No. 70 0.0083 0.21 210
177 mm No. 80 0.007 0.177 177
149 mm No. 100 0.0059 0.149 149
125 mm No. 120 0.0049 0.125 125
105 mm No. 140 0.0041 0.105 105
88 mm No. 170 0.0035 0.088 88
74 mm No. 200 0.0029 0.074 74
63 mm No. 230 0.0025 0.063 63
53 mm No. 270 0.0021 0.053 53
44 mm No. 325 0.0017 0.044 44
37 mm No. 400 0.0015 0.037 37

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