| Details | Description | Can Do | 
            
              
                | Class 1 | As plated, no subsequent heat treatment: A bake for hydrogen embrittlement relief is not considered a heat treatment. | Yes | 
              
              
                | Class 2 | Heat treated to obtain required hardness: Ma be used on all metals not affected by heating to 500F and above. | Yes | 
              
              
                | Class 3 | Aluminum alloys non-heat treatable, and beryllium alloys processed to improve adhesion of the deposit. | Yes | 
              
              
                | Class 4 | Aluminum alloys, heat-treatable, processed to improve adhesion of the nickel deposit. | Yes | 
              
              
                | Grade A | 0.0010 inch minimum thickness | Yes | 
              
              
                | Grade B | 0.0005 inch minimum thickness | Yes | 
              
              
                | Grade C | 0.0015 inch minimum thickness | Yes |