Washers
Regular Split
Lockwasher
METRIC
A B
T
W
METRIC - SPLIT LOCKWASHERS
Nominal Washer Size
DIN 127B
A
B
T
W
Inside Diameter
Outside Diameter
Section Thickness
Section Width
Max
Min
Ref
Ref
Ref
M2
2.4
2.1
4.4
0.50
0.9
M2.5
2.9
2.6
5.1
0.60
1
M3
3.4
3.1
6.2
0.80
1.3
M4
4.4
4.1
7.6
0.90
1.5
M5
5.4
5.1
9.2
1.20
1.8
M6
6.5
6.1
11.8
1.60
2.5
M8
8.5
8.1
14.8
2
3
M10
10.7
10.2
18.1
2.2
3.5
M12
12.7
12.2
21.1
2.5
4
M16
17.0
16.2
27.4
3.5
5
M20
21.2
20.2
33.6
4
6
M24
25.5
24.5
40
5
7
M30
31.7
30.5
48.2
6
8
M36
37.7
36.5
58.2
6
10
M42
43.7
42.5
68.2
7
12
M48
50.5
49
75
7
12
Description
A coiled, hardened, split circular washer with a slightly trapezoidal wire section, for use with metric screws.
Applications/
Advantages
(A) Applies greater bolt tension per unit of applied torque; (B) Provides a hardened bearing surface, creating more uniform torque
control; (C) Provides more uniform load distribution; (D) Resists loosening caused by vibration and corrosion;
(E) Is preferred lockwasher for use with hardened bearing surfaces.
Material
Spring steel
Hardness
Rockwell C 44 - 51
Plating
See Appendix-A for information about the plating of carbon steel and alloy steel lock washers.
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