Metric Flat Washers Per. ANSI B18.22M

Engineering ANSI Hardware Design Data
Engineering Metric Hardware Design Data

Metric ANSI Washer

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.

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