Machinery's Handbook, 31st Edition
1740
Metric Washers Table 30. American National Standard Metric Plain Washers ANSI/ASME B18.22M-1981 (R2017)
Inside Diameter, A
Outside Diameter, B
Thickness, C
Nominal Washer Size a
Washer Series Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Narrow Regular Wide Regular Wide Regular Wide Regular Wide Regular Wide Regular Wide Regular Wide Regular Wide Regular Wide
Max. 2.09 2.09 2.09 2.64 2.64 2.64 3.14 3.14 3.14 3.68 3.68 3.68 4.18 4.18 4.18 4.88 4.88 4.88 5.78 5.78 5.78 6.87 6.87 6.87 9.12 9.12 9.12 11.12 11.12 13.57 13.57 15.52 15.52 17.52 17.52 22.32 22.32 26.12 26.12 33.02 33.02 38.92 38.92
Min. 1.95 1.95 1.95 2.50 2.50 2.50 3.00 3.00 3.00 3.50 3.50 3.50 4.00 4.00 4.00 4.70 4.70 4.70 5.50 5.50 5.50 6.65 6.65 6.65 8.90 8.90 8.90 10.85 10.85 10.85 13.30 13.30 13.30 15.25 15.25 15.25 17.25 17.25 17.25 21.80 21.80 21.80 25.60 25.60 25.60 32.40 32.40 32.40 38.30 38.30 38.30
Max. 4.00 5.00 6.00 5.00 6.00 8.00 6.00 8.00 10.00 7.00 10.00 12.00 9.00 10.00 15.00 10.00 12.00 16.00 11.00 15.00 20.00 13.00 18.80 25.40 18.80 b 25.40 b 32.00 20.00 28.00 39.00 25.40 34.00 44.00 28.00 39.00 50.00 32.00 44.00 56.00 39.00 50.00 66.00 44.00 56.00 72.00 56.00 72.00 90.00 66.00 90.00 110.00
Min. 3.70 4.70 5.70 4.70 5.70 7.64 5.70 7.64 9.64 6.64 9.64 11.57 8.64 9.64 14.57 9.64 11.57 15.57 10.57 14.57 19.48 12.57 18.37 24.88 18.37 b 24.48 b 31.38 19.48 27.48 38.38 24.88 33.38 43.38 27.48 38.38 49.38 31.38 43.38 54.80 38.38 49.38 64.80 43.38 54.80 70.80 54.80 70.80 88.60 64.80 88.60 108.60
Max. 0.70 0.70 0.90 0.90 0.90 0.90 0.90 0.90 1.20 0.90 1.20 1.40 1.20 1.40 1.75 1.20 1.40 2.30 1.40 1.75 2.30 1.75 1.75 2.30 2.30 2.30 2.80 2.30 2.80 3.50 2.80 3.50 3.50 2.80 3.50 4.00 3.50 4.00 4.60 4.00 4.60 5.10 4.60 5.10 5.60 5.10 5.60 6.40 5.60 6.40 8.50
Min. 0.50 0.50 0.60 0.60 0.60 0.60 0.60 0.60 0.80 0.60 0.80 1.00 0.80 1.00 1.20 0.80 1.00 1.60 1.00 1.20 1.60 1.20 1.20 1.60 1.60 1.60 2.00 1.60 2.00 2.50 2.00 2.50 2.50 2.00 2.50 3.00 2.50 3.00 3.50 3.00 3.50 4.00 3.50 4.00 4.50 4.00 4.50 5.00 4.50 5.00 7.00
1.6
2
2.5
3
3.5
4
5
6
8
Narrow 11.12
10
Narrow 13.57
12
Narrow 15.52
14
Narrow 17.52
16
Narrow 22.32
20
Narrow 26.12
24
Narrow 33.02
30
Narrow 38.92
36
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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