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