STANDARD METRIC FLAT WASHER SIZES DIMENSIONS CHART

Metric flat washer dimensions sizes chart according to ISO 7089 "Plain washers — Normal series — Product grade A " standard. All dimensions are given in millimeters. Clearance hole, outside diameter and thickness dimensions are given for nominal thread diameter between 1.6 to 64 mm.

Metric Flat Washer Dimensions
Nominal Size
(Nominal Thread dia., d)		 d1 d2 h
Clearance Hole Outside dia. Thickness
nom.
(min)		 max. nom.
(max.)		 min. nom. max. min.
1.6 1.70 1.84 4.0 3.7 0.3 0.35 0.25
2 2.20 2.34 5.0 4.7 0.3 0.35 0.25
2.5 2.70 2.84 6.0 5.7 0.5 0.55 0.45
3 3.20 3.38 7.00 6.64 0.5 0.55 0.45
3.5* 3.70 3.88 8.00 7.64 0.5 0.55 0.45
4 4.30 4.48 9.00 8.64 0.8 0.9 0.7
5 5.30 5.48 10.00 9.64 1 1.1 0.9
6 6.40 6.62 12.00 11.57 1.6 1.8 1.4
8 8.40 8.62 16.00 15.57 1.6 1.8 1.4
10 10.50 10.77 20.00 19.48 2 2.2 1.8
12 13.00 13.27 24.00 23.48 2.5 2.7 2.3
14* 15.00 15.27 28.00 27.48 2.5 2.7 2.3
16 17.00 17.27 30.00 29.48 3 3.3 2.7
18* 19.00 19.33 34.00 33.38 3 3.3 2.7
20 21.00 21.33 37.00 36.38 3 3.3 2.7
22* 23.00 23.33 39.00 38.38 3 3.3 2.7
24 25.00 25.33 44.00 43.38 4 4.3 3.7
27* 28.00 28.33 50.00 49.38 4 4.3 3.7
30 31.00 31.39 56.00 55.26 4 4.3 3.7
33* 34.00 34.62 60.0 58.8 5 5.6 4.4
36 37.00 37.62 66.0 64.8 5 5.6 4.4
39* 42.00 42.62 72.0 70.8 6 6.6 5.4
42 45.00 45.62 78.0 76.8 8 9 7
45* 48.00 48.62 85.0 83.6 8 9 7
48 52.00 52.74 92.0 90.6 8 9 7
52* 56.00 56.74 98.0 96.6 8 9 7
56 62.00 62.74 105.0 103.6 10 11 9
60* 66.00 66.74 110.0 108.6 10 11 9
64 70.00 70.74 115.0 113.6 10 11 9

Note : * Non-preferred threads according to standard.

Supplements:

Link Usage
Metric flat washer dimensions calculator Calculator form of the metric flat washer dimensions chart.

Reference:

  • ISO 7089:2000, Plain washers — Normal series — Product grade A