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

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

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