ASTM A563 Nut Compatibility Chart

ASTM A563 Nut Compatibility Chart

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 1⁄4 to 11⁄2
A
  
B,D,DH
A,B,C,D,DH,DH3
>11⁄2 to 2  
A
A
C,D,DH,DH3
>2 to 4  
A
  
C,D,DH,DH3
A307 Grade B
 Any 1⁄4 to 11⁄2  
A
B,D,DH
A,B,C,D,DH,DH3
>11⁄2 to 2  
A
A
  
>2 to 4  
A
    
A325 Type 1
 Plain 1⁄2 – 11⁄2  
C
  
C3,D,DH,DH3
Galvanized 1⁄2 – 11⁄2  
DH
    
A325 Type 3
 Plain 1⁄2 – 11⁄2  
C3
  
DH3
A354 Grade BC
 Plain 1⁄4 to 11⁄2  
C
D,DH
C3,D,DH,DH3
>11⁄2 to 4  
C
  
C3,D,DH,DH3
Galvanized 1⁄4 to 11⁄2  
DH
    
>11⁄2 to 4  
DH
    
A354 Grade BD
 Plain 1⁄4 to 11⁄2  
DH
DH
D,DH,DH3
>11⁄2 to 4  
DH
  
DH3
A449
 Plain 1⁄4 to 11⁄2
B
  
D,DH
B,C,C3,D,DH,DH3
>11⁄2 to 3  
A
  
C,C3,D,DH,DH3
Galvanized 1⁄4 to 11⁄2  
DH
D,DH
D
>11⁄2 to 3  
DH
  
D
A490 Type 1
 Plain 1⁄2 – 11⁄2  
DH
  
DH3
A490 Type 3
 Plain 1⁄2 – 11⁄2  
DH3
    
A687
 Plain 5⁄8 – 3  
D
  
DH,DH3
Galvanized 5⁄8 – 3  
DH
    
F1554 Grade 36
 Any 1⁄4 to 11⁄2
A
  
B,D,DH
A,B,C,D,DH,DH3
>11⁄2 to 4  
A
  
C,D,DH,DH3
F1554 Grade 55
 Plain 1⁄4 to 11⁄2
A
  
B,D,DH
A,B,C,D,DH,DH3
>11⁄2 to 4  
A
  
C,D,DH,DH3
Galvanized 1⁄4 to 4  
A
  
C,D,DH,DH3
F1554 Grade 105
 Plain 1⁄4 to 11⁄2
D
    
DH,DH3
>11⁄2 to 3  
DH
  
DH3
Galvanized 1⁄4 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.

ASTM A194 Nut Compatibility Chart

Grade of Bolt A194 Heavy Hex Nut Grade
A193 Grade B7 2H
A193 Grade B8 (Class 1 and 2) 8
A193 Grade B8M (Class 1 and 2) 8M
A320 Grade L7 4 or 7
A320 Grade B8 (Class 1 and 2) 8
A320 Grade B8M (Class 1 and 2) 8M
For Class 2 stainless steel grades, strain hardened nuts available as a supplementary requirement