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American Metric Washers s ANSI B18.22M Size Table

Metric ISO Hardware Engineering Data
Inch ANSI Hardware Engineering Data
Fastener and Screw / Bolt Design, Formula & Calculations

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

American Metric Washers ANSI B18.22M Size Table

American National Standard Metric Plain Washers

Washer Sizea	Washer Series	Inside Diameter A		Outside Diameter B		Thickness C
		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.

Related

• Illustrative Washer Type Guide Illustration guide to the application of washers for designers
• Flat Plain Washers Type A American National Standard Type A Plain Washers - Preferred Sizes ANSI/ASME B18.22.1
• Flat Plain Washers Type B Type B Plain Flat Washers, ANSI/ASME B18.22.1
• Split Lock Washer ASME B18.2.2 Helical Spring Lock Washers ANSI/ASME B18.21.1
• Tooth Washer Internal - External Size Data Star Washers NSI/ASME B18.21.1 Size Data
• BS 4320 Plain Washer, Bright Metric Series
• BS 4320 Plain Washer, Black Metric Series
• BS 4464 Split Coil Washer Spring Metric Series Type A
• BS 4464, Single Coil Rectangular Spring Washer, Metric Series Types B and BP
• BS 4464 Double Coil Rectangular Section Spring Washer: Metric Series, Type D
• BS ISO EN 4463 Metric Crinkle Washers Specifications
• DIN 6797 Toothed lock washers, metric
• DIN 6798 Serrated Lock Washers, Metric
• Metric Flat Washer
• Metric Plain Flat Washers Per. ANSI B18.22M
• Flat Washers per. DIN 125