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1999-11-24, Rev. 1999-11-28.

All countries in the world except USA use millimeters (mm).   USA citizens:  To convert mm to inch, divide by 25.400.

Typical USA Flat Washer Dimensions  (All dimensions in units of mm unless otherwise specified.)

  Standard USS Flat Washer Standard SAE Flat Washer Flat Fender Washer, Standard Flat Fender Washer, Wide NAS1149 Standard- diameter Flat Washer NAS620 Reduced- diameter Flat Washer
USA Size Desig- nation Inner Diam- eter,
D1
Outer Diam- eter,
D2
Inner Diam- eter,
D1
Outer Diam- eter,
D2
Outer Diam- eter,
D2
Outer Diam- eter,
D2
Inner Diam- eter,
D1
Outer Diam- eter,
D2
Inner Diam- eter,
D1
Outer Diam- eter,
D2
                     
0                    
1                    
2   6.25                
3   6.95                
4   8.00         3.175 8.115    
6   9.90   7.90 19.05   3.785 9.7155    
8   11.22   9.40 22.10          
10   12.90   12.05 25.30 31.90        
12       14.40            
0.2500   19.05   15.95 25.75          
0.3125   22.60   17.70            
0.3750   26.00   20.90            
0.4375   26.00   23.60            
0.5000       27.05            
0.5625       30.10            
0.6250                    
0.7500                    
0.8750                    
1.0000                    
1.1250                    
1.2500                    
1.3750                    
1.5000