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Washer Sizes (Metric)

Washer Sizes (Metric)

Metric Flat Washers

All sizes are in millimeters

    Form A Form B Form C
Nominal Size   Internal Diameter   Outer   Thickness   Outer   Thickness   Outer   Thickness  
M1 1.1 2.5 0.3        
M1.2 1.3 3 0.3        
M1.4 1.5 3 0.3        
M1.6 1.7 4 0.3        
M2 2.2 5 0.3        
M2.5 2.7 6.5 0.5        
M3 3.2 7 0.5        
M3.5 3.7 7 0.5        
M4 4.3 9 0.8     10 0.8
M5 5.3 10 1 10 0.8 12.5 1
M6 6.4 12.5 1.6 12.5 0.8 14 1.6
M7 7.4 14 1.6 14 0.8    
M8 8.4 17 1.6 17 1 21 1.6
M10 10.5 21 2 21 1.2 24 2
M12 13 24 2.5 24 1.6 28 2.5
M14 15 28 2.5 28 1.6 30 2.5
M16 17 30 3 30 2 34 3
M18 19 34 3 34 2 37 3
M20 21 37 3 37 2 39 3
  23 39 3 39 2 44 3
M24 25 44 4 44 2.5 50 4
M27 28 55 4 50 2.5 56 4
M30 31 56 4 56 2.5 60 4

 

Metric Spring Washers

All sizes are in millimeters

    Rectangular Square
Nominal Size   Internal Diameter   Outer   Thickness   Outer   Thickness  
M2 2.1 4.4 0.5    
M2.5 2.6 5.1 0.6    
M3 3.1 6.2 0.8 5.5 1
M3.5 3.6 6.7 0.8 6 1
M4 4.1 7.6 0.9 6.95 1.2
M5 5.1 9.2 1.2 8.55 1.5
M6 6.1 11.8 1.6 9.6 1.5
M8 8.1 14.8 2 12.75 2
M10 10.2 18.1 2.2 15.9 2.5
M12 12.2 21.1 2.5 17.9 2.5
M14 14.2 24.1 3 21.1 3
M16 16.2 27.4 3.5 24.3 3.5
M18 18.2 29.4 3.5 26.4 3.5
M20 20.2 33.6 4 30.5 4.5
M22 22.5 35.9 4 32.7 4.5
M24 24.5 40 5 35.7 5
M27 27.5 43 5 38.9 5
M30 30.5 48.2 6 43.9 6
 

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