| STANDARD TEST SIEVES (Wire Cloth) | ||||||
| Sieve Designation | ||||||
| Standard | Alternative | Nominal Sieve Opening in | Permissible Variation of Average Opening from the Standard Sieve Designation | Maximum Opening Size for Not More than 5 percent of Openings | Maximum Individual Opening | Nominal Wire Diameter, mma |
| (1) | (2) | (3) | (4) | (5) | (6) | (7) |
| 125 mm | 5 in. | >5 | ± 3.7 mm | 130.0 mm | 130.9 mm | 8.0 |
| 100 mm | 4 in. | >4 | ± 3.0 mm | 104.0 mm | 104.8 mm | 6.30 |
| 75 mm | 3 in. | >3 | ± 2.2 mm | 78.1 mm | 78.7 mm | 5.80 |
| 50 mm | 2 in. | 2 | ± 1.5 mm | 52.1 mm | 52.6 mm | 5.05 |
| 25.0 mm | 1 in. | 1 | ± 0.8 mm | 26.1 mm | 26.4 mm | 3.80 |
| 12.5 mm | 1/2 in. | 0.500 | ± 0.39 mm | 13.10 mm | 13.31 mm | 2.67 |
| 6.3 mm | 1/4 in. | 0.250 | ± 0.20 mm | 6.64 mm | 6.78 mm | 1.82 |
| 5.6 mm | No. 3 1/2 | 0.223 | ± 0.18 mm | 5.90 mm | 6.04 mm | 1.68 |
| 4.75 mm | No. 4 | 0.187 | ± 0.15 mm | 5.02 mm | 5.14 mm | 1.54 |
| 4.00 mm | No. 5 | 0.157 | ± 0.13 mm | 4.23 mm | 4.35 mm | 1.37 |
| 3.35 mm | No. 6 | 0.132 | ± 0.11 mm | 3.55 mm | 3.66 mm | 1.23 |
| 2.80 mm | No. 7 | 0.111 | ± 0.095 mm | 2.975 mm | 3.070 mm | 1.10 |
| 2.36 mm | No. 8 | 0.0937 | ± 0.080 mm | 2.515 mm | 2.600 mm | 1.00 |
| 2.00 mm | No. 10 | 0.0787 | ± 0.070 mm | 2.135 mm | 2.215 mm | 0.900 |
| 1.70 mm | No. 12 | 0.0661 | ± 0.060 mm | 1.820 mm | 1.890 mm | 0.810 |
| 1.40 mm | No. 14 | 0.0555 | ± 0.050 mm | 1.505 mm | 1.565 mm | 0.725 |
| 1.18 mm | No. 16 | 0.0469 | ± 0.045 mm | 1.270 mm | 1.330 mm | 0.650 |
| 1.00 mm | No. 18 | 0.0394 | ± 0.040 mm | 1.080 mm | 1.135 mm | 0.580 |
| 850 µm | No. 20 | 0.0331 | ± 35 µm | 925 µm | 970 µm | 0.510 |
| 710 µm | No. 25 | 0.0278 | ± 30 µm | 775 µm | 815 µm | 0.450 |
| 600 µm | No. 30 | 0.0234 | ± 25 µm | 660 µm | 695 µm | 0.390 |
| 500 µm | No. 35 | 0.0197 | ± 20 µm | 550 µm | 585 µm | 0.340 |
| 425 µm | No. 40 | 0.0165 | ± 19 µm | 471 µm | 502 µm | 0.290 |
| 355 µm | No. 45 | 0.0139 | ± 16 µm | 396 µm | 425 µm | 0.247 |
| 300 µm | No. 50 | 0.0117 | ± 14 µm | 337 µm | 363 µm | 0.215 |
| 250 µm | No. 60 | 0.0098 | ± 12 µm | 283 µm | 306 µm | 0.180 |
| 212 µm | No. 70 | 0.0083 | ± 10 µm | 242 µm | 263 µm | 0.152 |
| 180 µm | No. 80 | 0.0070 | ± 9 µm | 207 µm | 227 µm | 0.131 |
| 150 µm | No. 100 | 0.0059 | ± 8 µm | 174 µm | 192 µm | 0.110 |
| 125 µm | No. 120 | 0.0049 | ± 7 µm | 147 µm | 163 µm | 0.091 |
| 106 µm | No. 140 | 0.0041 | ± 6 µm | 126 µm | 141 µm | 0.076 |
| 90 µm | No. 170 | 0.0035 | ± 5 µm | 108 µm | 122 µm | 0.064 |
| 75 µm | No. 200 | 0.0029 | ± 5 µm | 91 µm | 103 µm | 0.053 |
| 63 µm | No. 230 | 0.0025 | ± 4 µm | 77 µm | 89 µm | 0.044 |
| 53 µm | No. 270 | 0.0021 | ± 4 µm | 66 µm | 76 µm | 0.037 |
| 45 µm | No. 325 | 0.0017 | ± 3 µm | 57 µm | 66 µm | 0.030 |
| 38 µm | No. 400 | 0.0015 | ± 3 µm | 48 µm | 57 µm | 0.025 |
aThe average diameter of the warp and of the shoot wires, taken separately, of the cloth of any sieve shall not deviate from the nominal values by more than the following:
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