American Metric Washers s ANSI B18.22M Size Table

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Metric plain washers should be specified in the sequence : description, nominal size, series, material type, and finish, if required.

Metric Washer

American Metric Washers ANSI B18.22M Size Table

American National Standard Metric Plain Washers

Washer Size_a	Washer Series	Inside Diameter A		Outside Diameter B		Thickness C
Washer Size_a	Washer Series	Max	Min	Max	Min	Max	Min
1.6	Narrow Regular Wide	2.09 2.09 2.09	1.95 1.95 1.95	4.00 5.00 6.00	3.70 4.70 5.70	0.70 0.70 0.90	0.50 0.50 0.60
2	Narrow Regular Wide	2.64 2.64 2.64	2.50 2.50 2.50	5.00 6.00 8.00	4.70 5.70 7.64	0.90 0.90 0.90	0.60 0.60 0.60
2.5	Narrow Regular Wide	3.14 3.14 3.14	3.00 3.00 3.00	6.00 8.00 10.00	5.70 7.64 9.64	0.90 0.90 1.20	0.60 0.60 0.80
3	Narrow Regular Wide	3.68 3.68 3.68	3.50 3.50 3.50	7.00 10.00 12.00	6.64 9.64 11.57	0.90 1.20 1.40	0.60 0.80 1.00
3.5	Narrow Regular Wide	4.18 4.18 4.18	4.00 4.00 4.00	9.00 10.00 15.00	8.64 9.64 14.57	1.20 1.40 1.75	0.80 1.00 1.20
4	Narrow Regular Wide	4.88 4.88 4.88	4.70 4.70 4.70	10.00 12.00 16.00	9.64 11.57 15.57	1.20 1.40 2.30	0.80 1.00 1.60
5	Narrow Regular Wide	5.78 5.78 5.78	5.50 5.50 5.50	11.00 15.00 20.00	10.57 14.57 19.48	1.40 1.75 2.30	1.00 1.20 1.60
6	Narrow Regular Wide	6.87 6.87 6.87	6.65 6.65 6.65	13.00 18.80 25.40	12.57 18.37 24.88	1.75 1.75 2.30	1.20 1.20 1.60
8	Narrow Regular Wide	9.12 9.12 9.12	8.90 8.90 8.90	18.80 b 25.40 b 32.00	18.37 b 24.48 b 31.38	2.30 2.30 2.80	1.60 1.60 2.00
10	Narrow Regular Wide	11.12 11.12 11.12	10.85 10.85 10.85	20.00 28.00 39.00	19.48 27.48 38.38	2.30 2.80 3.50	1.60 2.00 2.50
12	Narrow Regular Wide	13.57 13.57 13.57	13.30 13.30 13.30	25.40 34.00 44.00	24.88 33.38 43.38	2.80 3.50 3.50	2.00 2.50 2.50
14	Narrow Regular Wide	15.52 15.52 15.52	15.25 15.25 15.25	28.00 39.00 50.00	27.48 38.38 49.38	2.80 3.50 4.00	2.00 2.50 3.00
16	Narrow Regular Wide	17.52 17.52 17.52	17.25 17.25 17.25	32.00 44.00 56.00	31.38 43.38 54.80	3.50 4.00 4.60	2.50 3.00 3.50
20	Narrow Regular Wide	22.32 22.32 22.32	21.80 21.80 21.80	39.00 50.00 66.00	38.38 49.38 64.80	4.00 4.60 5.10	3.00 3.50 4.00
24	Narrow Regular Wide	26.12 26.12 26.12	25.60 25.60 25.60	44.00 56.00 72.00	43.38 54.80 70.80	4.60 5.10 5.60	3.50 4.00 4.50
30	Narrow Regular Wide	33.02 33.02 33.02	32.40 32.40 32.40	56.00 72.00 90.00	54.80 70.80 88.60	5.10 5.60 6.40	4.00 4.50 5.00
36	Narrow Regular Wide	38.92 38.92 38.92	38.30 38.30 38.30	66.00 90.00 110.00	64.80 88.60 108.60	5.60 6.40 8.50	4.50 5.00 7.00

a Nominal washer sizes are intended for use with comparable screw and bolt sizes.
b The 18.80 ⁄18.37 and 25.40 ⁄24.48 mm outside diameters avoid washers which could be used in coin-operated devices.

All dimensions are in millimeters.

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