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	5/8 - 3		D		DH,DH3
	Galvanized	5/8 - 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

This technical information is supplied as a courtesy. All-Pro Fasteners, Inc. neither employs nor maintains an engineering or technical staff, and All-Pro is merely supplying certain manufacturing, technical, and/or design specifications and data received by All-Pro Fasteners, Inc. from the products’ manufacturer or taken from consensus standards, and is in no manner originated, developed, created, enhanced, altered, or approved by All-Pro Fasteners, Inc.