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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
Buckwheat	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

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