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.