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Metric Flat Washers Per. ANSI B18.22M
Engineering ANSI Hardware Design Data
Engineering Metric Hardware Design Data
Metric Plain Washer Designation. When specifying metric plain washers, the designation should include the following data in the sequence shown: description, nominal size, series, material type, and finish, if required.
Example:Plain washer, 6 mm, narrow, soft, steel, zinc plated Plain washer, 10 mm, regular, hardened steel.
Metric Flat Washers Per. ANSI B18.22M
All dimensions are in millimeters.
Nominal
Washer Size * |
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**
25.40** 32.00 |
18.37**
24.48** 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 |
* Nominal washer sizes are intended for use with comparable screw and bolt sizes.
** The 18.80 ⁄18.37 and 25.40 ⁄24.48 mm outside diameters avoid washers which could be used in coin-operated devices.