Specifications for sieves
This table lists the sieves to be used to assess dockage and grading factors. Sieves may be handheld or machine type. When using a handheld slotted sieve, ensure the slotted perforations are parallel with the sieving motion.
Note: Handheld sieves may be mounted in a mechanical sieve shaker. Confirm the counter is set to the specified number of motions and the sieve is positioned correctly.
| Type | Sieve name | Perforation size (millimetres) | Manufacturer’s designation (fraction of inches) |
|---|---|---|---|
| Round-hole (metric) | Number 4.5 | 1.79 | 4½/64 |
| Number 5 | 1.98 | 5/64 | |
| Number 5.5 | 2.18 | 5½/64 | |
| Number 6 | 2.38 | 6/64 | |
| Number 6.5 | 2.58 | 6½/64 | |
| Number 7 | 2.78 | 7/64 | |
| Number 7.5 | 2.98 | 7½/64 | |
| Number 8 | 3.18 | 8/64 | |
| Number 8.5 | 3.37 | 8½/64 | |
| Number 9 | 3.57 | 9/64 | |
| Number 10 | 3.97 | 10/64 | |
| Number 11 | 4.37 | 11/64 | |
| Number 12 | 4.76 | 12/64 | |
| Number 14 | 5.56 | 14/64 | |
| Number 15 | 5.95 | 15/64 | |
| Number 16 | 6.35 | 16/64 | |
| Number 17 | 6.75 | 17/64 | |
| Number 18 | 7.14 | 18/64 | |
| Number 20 | 7.94 | 20/64 | |
| Number 21 | 8.33 | 21/64 | |
| Number 22 | 8.73 | 22/64 | |
| Number 24 | 9.52 | 24/64 | |
| Round-hole (metric) | Number 7.0 mm | 7.0 | not applicable |
| Number 8.0 mm | 8.0 | not applicable | |
| Number 9.0 mm | 9.0 | not applicable | |
| Number 10.0 mm | 10.0 | not applicable | |
| Slotted | Number 4.5 | 1.79 x 12.70 | 4½/64 x 1/2 |
| Number 5 | 1.98 x 19.05 | 5/64 x 3/4 | |
| Number 6 | 2.38 x 19.05 | 6/64 x 3/4 | |
| Number 8 | 3.18 x 19.05 | 8/64 x 3/4 | |
| Number 9 | 3.57 x 19.05 | 9/64 x 3/4 | |
| Number 11 | 4.37 x 19.05 | 11/64 x 3/4 | |
| Number 12 | 4.76 x 19.05 | 12/16 x 3/4 | |
| Number 14 | 5.55 x 19.05 | 14/64 x 3/4 | |
| Number 16 | 6.35 x 19.05 | 16/64 x 3/4 | |
| Number 0.028 | 0.71 x 11.90 | 0.028 x 15/32 | |
| Number 0.032 | 0.81 x 11.90 | 0.032 x 15/32 | |
| Number 0.035 | 0.89 x 11.90 | 0.035 x 15/32 | |
| Number 0.038 | 0.96 x 11.90 | 0.038 x 15/32 | |
| Number 0.040 | 1.02 x 11.90 | 0.040 x 15/32 | |
| Buckwheat | Number 5 | triangle with 1.98 mm inscribed circle | triangle with 0.078 inch inscribed circle |
| Number 6 | triangle with 2.26 mm inscribed circle | triangle with 0.089 inch inscribed circle | |
| Wire | Number 3 x 16 | 3 x 16 mesh per 25.4 mm | 3 x 16 wire mesh per inch |
| Number 4 x 14 | 4 x 14 mesh per 25.4 mm | 4 x 14 wire mesh per inch | |
| Number 10 x 10 | 10 x 10 mesh per 25.4 mm | 10 x 10 wire mesh per inch | |
| Number 9 x 9 | 9 x 9 mesh per 25.4 mm | 9 x 9 wire mesh per inch |