Metric Split Lock Washers: Dimensions & Specifications

Metric - Split Lockwashers Drawing

METRIC - Split Lock Washers (DIN 127B)

 Nominal
Washer
Size

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Inside Diameter (A)

Outside Diameter (B)

Section Thickness (T)

Section Width (W)
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 hard coiled split circular washer with a slightly trapezoidal section for use with metric screws.

Applications/
Advantages


(A) Apply higher bolt tension per unit of added torque; (B) Provides a hard bearing surface, producing
more uniform torque control; (C) Provides greater uniform load distribution; (D) Resist's vibration and corrosion loosening ;
It's preferred when completed that the appearance is vital and the teeth under the head of the screw must be hidden;
(E) Lockwasher is preferred for use on hard bearing surfaces.


Material


Spring Steel
Hardness

Rockwell C 44-51
Plating

For details on carbon steel and alloy steel lock washer plating, see table above.