|
Sieve Designation |
Nominal Sieve Opening |
|
Standard |
Mesh |
inches |
mm |
Microns |
| 25.4
mm |
1
in. |
1.00 |
25.4 |
25400 |
|
22.6 mm |
7/8 in. |
0.875 |
22.6 |
22600 |
| 19.0
mm |
3/4
in. |
0.750 |
19.0 |
19000 |
|
16.0 mm |
5/8 in. |
0.625 |
16.0 |
16000 |
| 13.5
mm |
0.530 in. |
0.530 |
13.5 |
13500 |
|
12.7 mm |
1/2 in. |
0.500 |
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 |
8.00 |
8000 |
|
6.73 mm |
0.265
in. |
0.265 |
6.73 |
6730 |
| 6.35
mm |
1/4
in. |
0.250 |
6.35 |
6350 |
|
5.66 mm |
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 |
4.00 |
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 |
2.00 |
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 |
|
1.00 mm |
No. 18 |
0.0394 |
1.00 |
1000 |
|
0.841 mm |
No.
20 |
0.0331 |
0.841 |
841 |
|
0.707 mm |
No. 25 |
0.0278 |
0.707 |
707 |
|
0.595 mm |
No.
30 |
0.0234 |
0.595 |
595 |
|
0.500 mm |
No. 35 |
0.0197 |
0.500 |
500 |
|
0.420 mm |
No.
40 |
0.0165 |
0.420 |
420 |
|
0.354 mm |
No. 45 |
0.0139 |
0.354 |
354 |
|
0.297 mm |
No.
50 |
0.0117 |
0.297 |
297 |
|
0.250 mm |
No. 60 |
0.0098 |
0.250 |
250 |
|
0.210 mm |
No.
70 |
0.0083 |
0.210 |
210 |
|
0.177 mm |
No. 80 |
0.0070 |
0.177 |
177 |
|
0.149 mm |
No.
100 |
0.0059 |
0.149 |
149 |
|
0.125 mm |
No. 120 |
0.0049 |
0.125 |
125 |
|
0.105 mm |
No.
140 |
0.0041 |
0.105 |
105 |
|
0.088 mm |
No. 170 |
0.0035 |
0.088 |
88 |
|
0.074 mm |
No.
200 |
0.0029 |
0.074 |
74 |
|
0.063 mm |
No. 230 |
0.0025 |
0.063 |
63 |
|
0.053 mm |
No.
270 |
0.0021 |
0.053 |
53 |
|
0.044 mm |
No. 325 |
0.0017 |
0.044 |
44 |
|
0.037 mm |
No.
400 |
0.0015 |
0.037 |
37 |
|
Larger
sieve openings (1 in. to 1/4 in.) have been
designated by a sieve "mesh" size that
corresponds to the size of the opening in
inches. Smaller sieve "mesh" sizes of 3 1/2 to
400 are designated by the number of openings per
linear inch in the sieve. The following
convention is used to characterize particle size
by mesh designation:
- a "+" before the sieve mesh indicates
the particles are retained by the sieve;
- a "-" before the sieve mesh indicates
the particles pass through the sieve;
- typically 90% or more of the particles
will lie within the indicated range.
For example, if the particle size of a
material is described as -4 +40 mesh, then 90%
or more of the material will pass through a
4-mesh sieve (particles smaller than 4.76 mm)
and be retained by a 40-mesh
sieve (particles larger than 0.420 mm). If a
material is described as -40 mesh, then 90% or
more of the material will pass through a 40-mesh
sieve (particles smaller than 0.420 mm). |
|