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
Any 14 to 112
A
B,D,DH
A,B,C,D,DH,DH3
>112 to 2
A
A
C,D,DH,DH3
>2 to 4
A
C,D,DH,DH3
Any 14 to 112
A
B,D,DH
A,B,C,D,DH,DH3
>112 to 2
A
A
>2 to 4
A
Plain 12 - 112
C
C3,D,DH,DH3
Galvanized 12 - 112
DH
Plain 12 - 112
C3
DH3
Plain 14 to 112
C
D,DH
C3,D,DH,DH3
>112 to 4
C
C3,D,DH,DH3
Galvanized 14 to 112
DH
>112 to 4
DH
Plain 14 to 112
DH
DH
D,DH,DH3
>112 to 4
DH
DH3
Plain 14 to 112
B
D,DH
B,C,C3,D,DH,DH3
>112 to 3
A
C,C3,D,DH,DH3
Galvanized 14 to 112
DH
D,DH
D
>112 to 3
DH
D
Plain 12 - 112
DH
DH3
Plain 12 - 112
DH3
A687
Plain 58 - 3
D
DH,DH3
Galvanized 58 - 3
DH
Any 14 to 112
A
B,D,DH
A,B,C,D,DH,DH3
>112 to 4
A
C,D,DH,DH3
Plain 14 to 112
A
B,D,DH
A,B,C,D,DH,DH3
>112 to 4
A
C,D,DH,DH3
Galvanized 14 to 4
A
C,D,DH,DH3
Plain 14 to 112
D
DH,DH3
>112 to 3
DH
DH3
Galvanized 14 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