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  AN960 Flat Washers are used under hex nuts to provide a bearing surface and as shims to obtain the correct grip length for a bolt.They are also used adjust the position of AN310 and AN320 castle nuts for drilled cotter pin holes.   AN970 Flat Washers have a larger O.D. to  provide a greater bearing area than AN960 washers. Used under the head of the bolt and the nut to prevent crushing the surface.  
WASHER CHARTS
 
 AN960 FLAT WASHERS
Dash # Bolt Size O.D. I.D. L Reg Note
4 # 4 .312 .124 .016 .032  
6 # 6 .375 1.49 .016 .032  
8 # 8 .375 .174 .016 .032  
10 3/16 .483 .203 .016 .032  
416 1/4 .500 .265 .032 .063  
516 5/16 .562 .328 .032 .063  
616 3/8 .625 .390 .032 .063  
716 7/16 .750 .453 .032 .063  
816 1/2 .875 .515 .032 .063  
916 9/16 1.062 .578 .032 .063  
1016 5/8 1.118 .640 .032 .063  
1216 3/4 1.312 .765 .032 .090  
           
             
 
AN970 FLAT WASHERS
Dash # Bolt Size O.D. I.D. Thick Note
3 3/16 .875 203 .063  
4 1/4 1.125 .265 .063  
5 5/16 1.375 .328 .063  
6 3/8 1.625 .390 .063  
7 7/16 1.812 .109 .109  
8 1/2 2.00 ..515 .109  
10 5/8 2.375 .640 .125  
           
           
           
           
           
           
           
       
       
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