DIN 137A

Curved spring washers

Type A = curved

tech-din137A




Nominal Diameter M1 M1.2 M1.4 M1.7
d min=nominal size 1.1 1.3 1.5 1.8
max 1.35 1.55 1.75 2.05
dc Nominal Size 2.5 3 3 4
max 2.8 3.3 3.3 4.375
min 2.2 2.7 2.7 3.625
h Nominal Size 0.2 0.2 0.25 0.25
max 0.22 0.22 0.27 0.27
min 0.18 0.18 0.23 0.23
H min 0.35 0.35 0.4 0.45
max 0.7 0.7 0.8 0.9
per 1000 units ≈ kg ≈ 0.006 0.009 0.01 0.02

Nominal Diameter M1.8 M2 M2.3
d min=nominal size 1.9 2.2 2.5
max 2.15 2.45 2.75
dc Nominal Size 4 4.5 5
max 4.375 4.875 5.375
min 3.625 4.125 4.625
h Nominal Size 0.25 0.3 0.3
max 0.27 0.33 0.33
min 0.23 0.27 0.27
H min 0.45 0.5 0.5
max 0.9 1 1
per 1000 units ≈ kg ≈ 0.02 0.028 0.035

Nominal Diameter M2.6 M3 M3.5
d min=nominal size 2.8 3.2 3.7
max 3.05 3.5 4
dc Nominal Size 5.5 6 7
max 5.875 6.375 7.45
min 5.125 5.625 6.55
h Nominal Size 0.3 0.4 0.4
max 0.33 0.45 0.45
min 0.27 0.35 0.35
H min 0.55 0.65 0.7
max 1.1 1.3 1.4
per 1000 units ≈ kg ≈ 0.041 0.063 0.088

Nominal Diameter M4 M5 M6
d min=nominal size 4.3 5.3 6.4
max 4.6 5.6 6.76
dc Nominal Size 8 10 11
max 8.45 10.45 11.55
min 7.55 9.55 10.45
h Nominal Size 0.5 0.5 0.5
max 0.55 0.55 0.55
min 0.45 0.45 0.45
H min 0.8 0.9 1.1
max 1.6 1.8 2.2
per 1000 units ≈ kg ≈ 0.14 0.222 0.247

Nominal Diameter M7 M8 M10
d min=nominal size 7.4 8.4 10.5
max 7.76 8.76 10.93
dc Nominal Size 12 15 18
max 12.55 15.55 18.55
min 11.45 14.45 17.45
h Nominal Size 0.5 0.5 0.8
max 0.55 0.55 0.86
min 0.45 0.45 0.74
H min 1.2 1.7 2
max 2.4 3.4 4
per 1000 units ≈ kg ≈ 0.265 0.476 1.05



All information is strictly informative