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ASTM A563 Nut Compatibility Chart

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Grade of Bolt Surface Finish Nominal Size Inches A563 Grade and ANSI Nut Style
Recommended Suitable
Hex Heavy
Hex		 Hex Heavy
Hex
A307 Grade A & C
 Any ¼ to 1½
A
  
B,D,DH
A,B,C,D,DH,DH3
>1½ to 2  
A
A
C,D,DH,DH3
>2 to 4  
A
  
C,D,DH,DH3
A307 Grade B
 Any ¼ to 1½  
A
B,D,DH
A,B,C,D,DH,DH3
>1½ to 2  
A
A
  
>2 to 4  
A
    
A325 Type 1
 Plain ½ - 1½  
C
  
C3,D,DH,DH3
Galvanized ½ - 1½  
DH
    
A325 Type 3
 Plain ½ - 1½  
C3
  
DH3
A354 Grade BC
 Plain ¼ to 1½  
C
D,DH
C3,D,DH,DH3
>1½ to 4  
C
  
C3,D,DH,DH3
Galvanized ¼ to 1½  
DH
    
>1½ to 4  
DH
    
A354 Grade BD
 Plain ¼ to 1½  
DH
DH
D,DH,DH3
>1½ to 4  
DH
  
DH3
A449
 Plain ¼ to 1½
B
  
D,DH
B,C,C3,D,DH,DH3
>1½ to 3  
A
  
C,C3,D,DH,DH3
Galvanized ¼ to 1½  
DH
D,DH
D
>1½ to 3  
DH
  
D
A490 Type 1
 Plain ½ - 1½  
DH
  
DH3
A490 Type 3
 Plain ½ - 1½  
DH3
    
A687
 Plain ⅝ - 3  
D
  
DH,DH3
Galvanized ⅝ - 3  
DH
    
F1554 Grade 36
 Any ¼ to 1½
A
  
B,D,DH
A,B,C,D,DH,DH3
>1½ to 4  
A
  
C,D,DH,DH3
F1554 Grade 55
 Plain ¼ to 1½
A
  
B,D,DH
A,B,C,D,DH,DH3
>1½ to 4  
A
  
C,D,DH,DH3
Galvanized ¼ to 4  
A
  
C,D,DH,DH3
F1554 Grade 105
 Plain ¼ to 1½
D
    
DH,DH3
>1½ to 3  
DH
  
DH3
Galvanized ¼ to 3  
DH
  
DH3

1. The availability of A563 grade DH nuts in nominal sizes 3/4" and larger is very limited and generally available only on special orders of 50,000 or more. For smaller quantities, ASTM A194 grade 2H should be considered.