Powder sizes

U.S.A. sieve series and tyler equivalents, Tyler standard screen scale sieves.

U.S.A. sieve series and tyler equivalents

Sieve Designation		Sieve Opening		Nominal Wire Diameter		Tyler Screen Scale Equiv. Designation
Standard(a)	Alternate	mm	Equivalent	mm	Equivalent	Tyler Screen Scale Equiv. Designation
125 mm	5.in.	125	5	8	0.315
106 mm	4.24 in.	106	4.24	6.4	0.252
100 mm	4.0 in. (b)	100	4	6.3	0.248
90 mm	3 1/2 in.	90	3.5	6.08	0.2394
75 mm	3.0 in.	75	3	5.8	0.2283
63 mm	2 1/2 in.	63	2.5	5.5	0.2165
53 mm	2.12 in.	53	2.12	5.15	0.2028
50 mm	2.0 in. (b)	50	2	5.05	0.1988
45 mm	1 3/4 in.	45	1.75	4.85	0.1909
37.5 mm	1 1/2 in.	37.5	1.5	4.59	0.1807
31.5 mm	1 1/4 in.	31.5	1.25	4.23	0.1665
26.5 mm	1.06 in.	26.5	1.06	3.9	0.1535	1.050 in.
25.0 mm	1.0 in. (b)	25	1	3.8	0.1496
22.4 mm	7/8 in.	22.4	0.875	3.5	0.1378	.883 in.
19.0 mm	3/4 in.	19	0.75	3.3	0.1299	.742 in.
16.0 mm	5/8 in.	16	0.625	3	0.1181	.624 in.
13.2 mm	.530 in.	13.2	0.53	2.75	0.1083	.525 in.
12.5 mm	1/2 in. (b)	12.5	0.5	2.67	0.1051
11.2 mm	7/16 in.	11.2	0.438	2.45	0.0965	.441 in.
9.5 mm	3/8 in.	9.5	0.375	2.27	0.0894	.371 in.
8.0 mm	5/16 in.	8	0.312	2.07	0.0815	2 1/2 mesh
6.7 mm	.265 in.	6.7	0.265	1.87	0.0736	3.0 mesh
6.3 mm	1/4 in. (b)	6.3	0.25	1.82	0.0717
5.6 mm	No. 3 1/2 ©	5.6	0.223	1.68	0.0661	3 1/2 mesh
4.75 mm	No. 4	4.75	0.187	1.54	0.0606	4 mesh
4.00 mm	No. 5	4	0.157	1.37	0.0539	5 mesh
3.35 mm	No. 6	3.35	0.132	1.23	0.0484	6 mesh
2.80 mm	No. 7	2.8	0.111	1.1	0.043	7 mesh
2.36 mm	No. 8	2.36	0.0937	1	0.0394	8 mesh
2.00 mm	No. 10	2	0.0787	0.9	0.0354	9 mesh
1.70 mm	No. 12	1.7	0.0661	0.81	0.0319	10 mesh
1.40 mm	No. 14	1.4	0.0555	0.725	0.0285	12 mesh
1.18 mm	No. 16	1.18	0.0469	0.65	0.0256	14 mesh
1.00 mm	No. 18	1	0.0394	0.58	0.02285	16 mesh
850 um	No. 20	0.85	0.0331	0.51	0.0201	20 mesh
710 um	No. 25	0.71	0.0278	0.45	0.0177	24 mesh
600 um	No. 30	0.6	0.0234	0.39	0.0154	28 mesh
500 um	No. 35	0.5	0.0197	0.34	0.0134	32 mesh
425 um	No. 40	0.425	0.0165	0.29	0.0114	35 mesh
355 um	No. 45	0.355	0.0139	0.247	0.0097	42 mesh
300 um	No. 50	0.3	0.0117	0.215	0.0085	48 mesh
250 um	No. 60	0.25	0.0098	0.18	0.0071	60 mesh
212 um	No. 70	0.212	0.00083	0.152	0.006	65 mesh
180 um	No. 80	0.18	0.007	0.131	0.0052	80 mesh
150 um	No. 100	0.15	0.0059	0.11	0.0043	100 mesh
125 um	No. 120	0.125	0.0049	0.091	0.0036	115 mesh
106 um	No. 140	0.106	0.0041	0.076	0.003	150 mesh
90 um	No. 170	0.09	0.0035	0.064	0.0025	170 mesh
75 um	No. 200	0.075	0.0029	0.053	0.0021	200 mesh
63 um	No. 230	0.063	0.0025	0.044	0.0017	250 mesh
53 um	No. 270	0.053	0.0021	0.037	0.0015	270 mesh
45 um	No 325	0.045	0.0017	0.03	0.012	325 mesh
38 um	No. 400	0.038	0.0015	0.025	0.001	400 mesh

(a) These standard designations correspond to the values for test sieve apertures recommended by the International Standards Organization Geneva, Switzerland.

(b) These sieves are not in the fourth root of 2 Series, but they have been included because they are in common usage.

(c) These numbers (3 1/2 to 400) are the approximate number of openings per linear inch but it is preferred that the sieve be identified by the standard designation in millimeters or um.

Tyler standard screen scale sieves

Tyler Standard Scale	Closer Sizing Ratio	Mesh Designation	USA Sieve Series Equivalents
Opening in Inches	Opening in Inches		Standard Designation	Alternate Designation
1.05	1.05		26.5 mm	1.06 in.
	0.883		22.4 mm	7/8 in.
0.742	0.742		19.0 mm	3/4 in.
	0.624		16.0 mm	5/8 in.
0.525	0.525		13.2 mm	.530 in.
	0.441		11.2 mm	7/16 in.
0.371	0.371		9.5 mm	3/8 in.
	0.312	2.5	8.0 mm	5/16 in.
0.263	0.263	3	6.7 mm	.265 in.
	0.221	3.5	5.6 mm	No. 3 1/2
0.185	0.185	4	4.75 mm	No. 4
	0.156	5	4.00 mm	No. 5
0.131	0.131	6	3.35 mm	No. 6
	0.11	7	2.80 mm	No. 7
0.093	0.093	8	2.36 mm	No. 8
	0.078	9	2.00 mm	No. 10
0.065	0.065	10	1.70 mm	No. 12
	0.055	12	1.40 mm	No. 14
0.046	0.046	14	1.18 mm	No. 16
	0.039	16	1.00 mm	No. 18
0.0328	0.0328	20	850 um	No. 20
	0.0276	24	710 um	No. 25
0.0232	0.0232	28	600 um	No. 30
	0.0195	32	500 um	No. 35
0.0164	0.0164	35	425 um	No. 40
	0.0138	42	355 um	No. 45
0.0116	0.0116	48	300 um	No. 50
	0.0097	60	250 um	No. 60
0.0082	0.0082	65	212 um	No. 70
	0.0069	80	180 um	No. 80
0.0058	0.0058	100	150 um	No. 100
	0.0049	115	125 um	No. 120
0.0041	0.0041	150	106 um	No. 140
	0.0035	170	90 um	No. 170
0.0029	0.0029	200	75 um	No. 200
	0.0024	250	63 um	No. 230
0.0021	0.0021	270	53 um	No. 270
	0.0017	325	45 um	No. 235
0.0015	0.0015	400	38 um	No. 400

In the table of the Tyler Standard Screen Scale Sieve Series both the square root of two Series as well as the expanded series for closer sizing according to the fourth root of two as shown.

U.S.A. sieve series and tyler equivalents, Tyler standard screen scale sieves.

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