Specifications for sieves - Chapter 3 | Official Grain Grading Guide

This table lists the sieves to be used to assess dockage and grading factors.

Sieves for assessing dockage and grading factors
Type Sieve name Perforation size
(millimetres)
Manufacturer’s designation
(Fraction of inches)
Round-hole No. 4.5 1.79 4½/64
No. 5 1.98 5/64
No. 5.5 2.18 5½/64
No. 6 2.38 6/64
No. 6.5 2.58 6½/64
No. 7 2.78 7/64
No. 7.5 2.98 7½/64
No. 8 3.18 8/64
No. 8.5 3.37 8½/64
No. 9 3.57 9/64
No. 10 3.97 10/64
No. 11 4.37 11/64
No. 12 4.76 12/64
No. 14 5.56 14/64
No. 15 5.95 15/64
No. 16 6.35 16/64
No. 17 6.75 17/64
No. 18 7.14 18/64
No. 20 7.94 20/64
No. 21 8.33 21/64
No. 22 8.73 22/64
No. 24 9.52 24/64
Round-hole Metric No. 8.0 mm 8.0 N/A
No. 9.0 mm 9.0 N/A
No. 10.0 mm 10.0 N/A
Slotted No. 4.5 1.79 x 12.70 4½/64 x 1/2
No. 5 1.98 x 19.05 5/64 x 3/4
No. 6 2.38 x 19.05 6/64 x 3/4
No. 8 3.18 x 19.05 8/64 x 3/4
No. 9 3.57 x 19.05 9/64 x 3/4
No. 11 4.37 x 19.05 11/64 x 3/4
No. 12 4.76 x 19.05 12/16 x 3/4
No. 0.028 0.71 x 11.90 0.028 x 15/32
No. 0.032 0.81 x 11.90 0.032 x 15/32
No. 0.035 0.89 x 11.90 0.035 x 15/32
No. 0.038 0.96 x 11.90 0.038 x 15/32
No. 0.040 1.02 x 11.90 0.040 x 15/32
Buckwheat No. 5 triangle with 1.98 mm inscribed circle triangle with 0.078 inch inscribed circle
No. 6 triangle with 2.26 mm inscribed circle triangle with 0.089 inch inscribed circle
Wire No. 3 x 16 3 x 16 mesh per 25.4 mm 3 x 16 wire mesh per inch
No. 4 x 14 4 x 14 mesh per 25.4 mm 4 x 14 wire mesh per inch
No. 10 x 10 10 x 10 mesh per 25.4 mm 10 x 10 wire mesh per inch
No. 9 x 9 9 x 9 mesh per 25.4 mm 9 x 9 wire mesh per inch