Standard sieves designations and Mesh sizes
TYLER ASTM BS_410 DIN_4188

HOME Email Webmaster


Related link: syringe sizes

Sieves Standard no. Mesh sizes and Designations

See below for Particle size conversions

Mesh Size   (microns)	TYLER	ASTM-E11	BS-410	DIN-4188
µm	Mesh	No.	Mesh	mm
5	2500		2500	0.005
10	1250		1250	0.010
15	800		800	0.015
20	625		625	0.020
22				0.022
25	500		500	0.025
28				0.028
32				0.032
36				0.036
38	400	400	400
40				0.040
45	325	325	350	0.045
50				0.050
53	270	270	300
56				0.056
63	250	230	240	0.063
71				0.071
75	200	200	200
80				0.080
90	170	170	170	0.090
100				0.100
106	150	140	150
112				0.112
125	115	120	120	0.125
140				0.140
150	100	100	100
160				0.160
180	80	80	85	0.180
200				0.200
212	65	70	72
250	60	60	60	0.250
280				0.280
300	48	50	52
315				0.315
355	42	45	44	0.355
400				0.400
425	35	40	36
450				0.450
500	32	35	30	0.500
560				0.560
600	28	30	25

Copyright © 1995-2003,  Process Associates of America.  All Rights Reserved.

Particle Size Conversion

Sieve Designation		Nominal Sieve Opening
Standard	Inches	Mesh	mm	Microns
25.4mm	1 in.	21.00	25.4	225400
222.6mm	7/8 in.	20.875	22.6	222600
219.0mm	3/4 in.	20.750	19.0	219000
216.0mm	5/8 in.	20.625	16.0	216000
213.5mm	0.530 in.	20.530	13.5	213500
212.7mm	1/2 in.	20.500	12.7	212700
211.2mm	7/16 in.	20.438	11.2	211200
29.51mm	3/8 in.	20.375	9.51	29510
28.00mm	5/16 in.	20.312	8.00	28000
26.73mm	0.265 in.	20.265	6.73	26730
26.35mm	1/4 in.	20.250	6.35	26350
25.66mm	No. 3 1/2	20.223	5.66	25660
24.76mm	No. 4	20.187	4.76	24760
24.00mm	No. 5	20.157	4.00	24000
23.36mm	No. 6	20.132	3.36	23360
22.83mm	No. 7	20.111	2.83	22830
22.38mm	No. 8	20.0937	2.38	22880
22.00mm	No. 10	20.0787	2.00	22000
21.68mm	No. 12	0.0661	1.68	21680
21.41mm	No. 14	20.0555	1.41	21410
1.19mm	No. 16	20.0496	1.19	21190
21.00mm	No. 18	20.0394	1.00	21000
2841µm	No. 20	20.0331	0.841	2841
2707µm	No. 25	20.0278	0.707	2707
2595µm	No. 30	20.0234	0.595	2595
2500µm	No. 35	20.0197	0.500	2500
2420µm	No. 40	20.0165	0.420	2420
2345µm	No. 45	0.0139	0.345	2345
2297µm	No. 50	20.0117	0.297	2297
2250µm	No. 60	20.0098	0.250	2250
2210µm	No. 70	20.0083	0.210	2210
2177µm	No. 80	20.0070	0.177	2177
2149µm	No. 100	20.0059	0.149	2149
2125µm	No. 120	20.0049	0.125	2125
2105µm	No. 140	20.0041	0.105	2105
288µm	No. 170	20.0035	0.088	288
274µm	No. 200	20.0029	0.074	274
263µm	No. 230	20.0025	0.063	263
253µm	No. 270	20.0021	0.053	253
244µm	No. 325	20.0017	0.044	244
237µm	No. 400	20.0015	0.037	237
NOTES: Larger sieve openings (1 in. to 1/4 in.) have been designated by a sieve "mesh" size that corresponds to the size of the opening in inches. Smaller sieve "mesh" sizes of 3 1/2 to 400 are designated by the number of openings per linear inch in the sieve. The following convention is used to characterize particle size by mesh designation: a "+" before the sieve mesh indicates the particles are retained by the sieve; a "-" before the sieve mesh indicates the particles pass through the sieve; typically 90% or more of the particles will lie within the indicated range. For example, if the particle size of a material is described as -4 +40 mesh, then 90% or more of the material will pass through a 4-mesh sieve (particles smaller than 4.76 mm) and be retained by a 40-mesh sieve (particles larger than 0.420 mm). If a material is described as -40 mesh, then 90% or more of the material will pass through a 40-mesh sieve (particles smaller than 0.420 mm). This information is also provided on page T848 of the Aldrich 2003-2004 Catalog/Handbook of Fine Chemicals.