Nut Compatibility Chart

Find compatible nuts for ASTM A307, A325, A490, F1554, and more. Detailed charts for hex and heavy hex nuts across various grades and finishes.

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