Heavy Duty flat washers are designed and made for the rough conditions and service. 
These washers are BZP plated. BZP (bright zinc paint) plating is a coating used to help prevent bimetallic corrosion.
 
                                                            
                            
                                
                                    
                                        | Item No. | 
                                                    Inside Diameter (mm) | 
                                                    Outside Diameter (mm) | 
                                                    Thickness (mm) | 
                                                    Inside Diameter (inches) | 
                                                    Outside Diameter (inches) | 
                                                    Gauge No. | 
                                    
                                
                                
                                        
                                            | FW10 | 
                                                    
5                                                     | 
                                                    
12                                                     | 
                                                    
1.0                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                        
                                        
                                            | FW11 | 
                                                    
6                                                     | 
                                                    
14                                                     | 
                                                    
1.6                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                        
                                        
                                            | FW12 | 
                                                    
8                                                     | 
                                                    
21                                                     | 
                                                    
1.6                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                        
                                        
                                            | FW13 | 
                                                    
10                                                     | 
                                                    
24                                                     | 
                                                    
2.0                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                        
                                        
                                            | FW14 | 
                                                    
12                                                     | 
                                                    
28                                                     | 
                                                    
2.5                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                        
                                        
                                            | FW15 | 
                                                    
14                                                     | 
                                                    
30                                                     | 
                                                    
2.5                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                        
                                        
                                            | FW16 | 
                                                    
16                                                     | 
                                                    
34                                                     | 
                                                    
3.0                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                        
                                        
                                            | FW17 | 
                                                    
20                                                     | 
                                                    
39                                                     | 
                                                    
3.0                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                        
                                        
                                            | FW2 | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
3/16                                                     | 
                                                    
1/2                                                     | 
                                                    
17                                                     | 
                                        
                                        
                                            | FW3 | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
1/4                                                     | 
                                                    
5/8                                                     | 
                                                    
17                                                     | 
                                        
                                        
                                            | FW4 | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
5/16                                                     | 
                                                    
3/4                                                     | 
                                                    
15                                                     | 
                                        
                                        
                                            | FW5 | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
3/8                                                     | 
                                                    
7/8                                                     | 
                                                    
15                                                     | 
                                        
                                        
                                            | FW6 | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
7/16                                                     | 
                                                    
1                                                     | 
                                                    
13                                                     | 
                                        
                                        
                                            | FW7 | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
1/2                                                     | 
                                                    
1.1/8                                                     | 
                                                    
13                                                     | 
                                        
                                        
                                            | FW8 | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
5/8                                                     | 
                                                    
1.3/8                                                     | 
                                                    
11                                                     | 
                                        
                                        
                                            | FW9 | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
3/4                                                     | 
                                                    
1.5/8                                                     | 
                                                    
10                                                     | 
                                        
                                        
                                            | FW18 | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
9/16                                                     | 
                                                    
1.1/4                                                     | 
                                                    
10                                                     | 
                                        
                                        
                                            | FW19 | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
7/8                                                     | 
                                                    
1.7/8                                                     | 
                                                    
9                                                     | 
                                        
                                        
                                            | FW20 | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
–                                                     | 
                                                    
1                                                     | 
                                                    
2.1/8                                                     | 
                                                    
8                                                     | 
                                        
                                
                            
                         
                        
                            
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